Layered heterogeneous magnesium alloy profile as well as preparation method and application thereof

Abstract

The invention provides a layered isomeric magnesium alloy profile and a preparation method and application thereof, and relates to the field of magnesium alloy material processing.The preparation method of the layered isomeric magnesium alloy profile comprises the steps that a plurality of first magnesium alloy blanks and a plurality of second magnesium alloy blanks are provided; and solution treatment is conducted on the first magnesium alloy green bodies and the second magnesium alloy green bodies, a plurality of first pretreated green bodies and second pretreated green bodies are obtained, and the average grain size of the first pretreated green bodies is different from that of the second pretreated green bodies. And the first pretreated green bodies and the second pretreated green bodies are sequentially and alternately stacked, the adjacent first pretreated green bodies and the adjacent second pretreated green bodies are combined through a stirring friction additive process, and the composite green body is obtained. And the composite blank is sequentially subjected to extrusion forming and aging treatment, and the layered heterogeneous magnesium alloy profile is obtained. According to the preparation method of the layered heterogeneous magnesium alloy profile provided by the invention, the magnesium alloy blanks with different structures and properties are combined through a stirring friction additive process, and the layered heterogeneous structure is formed, so that the magnesium alloy profile obtains excellent strength and plasticity.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of magnesium alloy material processing, and particularly relates to a layered heterogeneous magnesium alloy profile and a preparation method and application thereof. BACKGROUND

[0002] With the increasingly severe service environment of components, higher requirements for the strength and plasticity of metal materials are put forward in the fields of aerospace, transportation, weapon equipment, etc. For a long time, material scientists have been committed to developing metal structural materials with high strength and high plasticity.

[0003] Among them, magnesium alloy has the advantages of low density, high specific strength, high specific rigidity, high thermal conductivity and good electromagnetic shielding performance, etc., and has broad application prospects in the above-mentioned fields. Because the strength and plasticity of the alloy often show a kind of trade-off relationship, that is, when the strength is enhanced, the plasticity will be weakened accordingly. Therefore, in the related technology, the strength and plasticity of the alloy are improved by grain refinement and other methods.

[0004] However, although grain refinement can improve the strength and plasticity of the alloy, when nano-crystalline or ultra-fine crystalline is formed, due to the difficulty of storing dislocations in small grains, the work hardening rate and ductility of the material are reduced, so that the strength is significantly improved while the plasticity is sharply decreased. In addition, the preparation of fine-grained or ultra-fine-grained materials often needs to rely on large plastic deformation or ultra-low temperature deformation technology, which has many limitations in preparation size and experimental conditions, which seriously limits the industrial application. SUMMARY

[0005] The application provides a layered heterogeneous magnesium alloy profile and a preparation method and application thereof, which combines magnesium alloy blanks with different organizations and properties by a friction stir additive process, and forms a layered heterogeneous organization, so that the magnesium alloy profile obtains excellent strength and plasticity.

[0006] In a first aspect, the application provides a preparation method of a layered heterogeneous magnesium alloy profile, comprising:

[0007] providing a plurality of first magnesium alloy blanks and a plurality of second magnesium alloy blanks;

[0008] respectively performing solid solution treatment on each first magnesium alloy blank and each second magnesium alloy blank to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks, and the average grain size of the first pretreated blanks is different from that of the second pretreated blanks;

[0009] stacking the first pretreated blanks and the second pretreated blanks alternately in sequence, and combining adjacent first pretreated blanks and second pretreated blanks by a friction stir additive process to obtain a composite blank;

[0010] The composite blank is sequentially subjected to extrusion forming and aging treatment to obtain the layered heterogeneous magnesium alloy profile.

[0011] Further, the rotation speed of the stirring head in the friction stir additive process is 750 rpm-5000 rpm, and the feeding speed is 10 mm / min-500 mm / min.

[0012] Further, the temperature in the solid solution treatment is 400 DEG C-520 DEG C, and the time length is 8 h-72 h.

[0013] Further, the temperature in the aging treatment is 180 DEG C-250 DEG C, and the time length is 8 h-100 h.

[0014] Further, the temperature of the composite blank in the extrusion forming is 400 DEG C-500 DEG C, the temperature of the die is 300 DEG C-400 DEG C, the extrusion speed is 0.2 mm / s-20 mm / s, and the extrusion ratio is 5-60:1.

[0015] Further, after the solid solution treatment of each first magnesium alloy blank and each second magnesium alloy blank, pre-aging treatment is further carried out on each first magnesium alloy blank or each second magnesium alloy blank, the temperature is 225 DEG C-400 DEG C, and the time length is 8 h-24 h.

[0016] In the second aspect, the application further provides a layered heterogeneous magnesium alloy profile prepared by any one of the preparation methods of the layered heterogeneous magnesium alloy profile provided in the first aspect.

[0017] In the third aspect, the application further provides an application of the layered heterogeneous magnesium alloy profile prepared by any one of the preparation methods of the layered heterogeneous magnesium alloy profile provided in the first aspect in the fields of aerospace, transportation and special equipment.

[0018] The implementation of the application has at least the following beneficial effects:

[0019] The preparation method of the layered heterogeneous magnesium alloy profile provided by the application comprises the following steps: providing a plurality of first magnesium alloy blanks and a plurality of second magnesium alloy blanks, respectively carrying out solid solution treatment on each first magnesium alloy blank and each second magnesium alloy blank to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks, and the average grain size of the first pretreated blank is different from that of the second pretreated blank, sequentially and alternately stacking each first pretreated blank and each second pretreated blank, and combining adjacent first pretreated blanks and second pretreated blanks through a friction stir additive process to obtain a composite blank, and sequentially subjecting the composite blank to extrusion forming and aging treatment to obtain the layered heterogeneous magnesium alloy profile.

[0020] 1. Prepare magnesium alloy blanks with different strength and plasticity levels for friction stir additive manufacturing. Different strength and plasticity levels of the blanks can be achieved by using different alloy compositions (e.g. high strength requires high content alloy, medium strength requires moderate content alloy, low strength requires low content alloy) or by different solid solution treatment processes, pre-aging treatment. By the difference of strength and plasticity of different layers of the blanks, heterogeneous deformation induced strengthening and hardening are generated, thereby preparing heterogeneous microstructure with different characteristics. In addition, the thickness of each layer of the heterogeneous microstructure can also be adjusted by the thickness of the blank and the extrusion ratio to achieve free adjustment of the layer thickness ratio. Under the condition of a certain extrusion ratio, the thicker the initial blank, the thicker the corresponding layer in the extruded material, and the thinner the initial blank, the smaller the thickness of the corresponding layer in the extruded material. Under the condition of a certain blank thickness, by increasing the extrusion ratio, the thickness of each layer can be further reduced.

[0021] 2. The prepared magnesium alloy material is pretreated according to the design requirements of the heterogeneous microstructure. The pretreatment methods include various methods, mainly solid solution treatment or solid solution treatment + pre-aging treatment. By changing the solid solution treatment temperature or time, alloys with different initial grain sizes can be formed in the alloy, thereby affecting the dynamic recrystallization behavior of the alloy during friction stir additive manufacturing, forming grain structures with different recrystallization fractions and grain sizes in the extruded material. High recrystallization fraction structure usually has lower strength and higher plasticity, while low recrystallization fraction structure has higher strength and lower plasticity, thereby obtaining heterogeneous microstructure with different strength and plasticity levels in different layers. Through the solid solution treatment + pre-aging treatment method, precipitates can be formed in the alloy. In the process of friction stir additive manufacturing and extrusion, the particle nucleation effect of the precipitates is used to affect the dynamic recrystallization behavior of the alloy, forming fine or ultra-fine grain structures with low texture strength. Combined with the weak strengthening effect of the precipitates obtained after stirring, the plasticity of the layer structure can be significantly improved, and high strength can be provided by other blanks that have not been subjected to solid solution treatment + pre-aging treatment, thereby obtaining heterogeneous microstructure with different strength and plasticity levels in different layers.

[0022] 3. In the friction stir additive manufacturing process, blanks prepared by different compositions or different pretreatment processes are combined to form a multilayer blank with different strength and plasticity levels and microstructure characteristics. Moreover, during the friction stir additive manufacturing process, high rotation speed and low feed process parameters are preferred to increase the heat input during the friction stir process, thereby improving the bonding force between the layers.

[0023] 4. The blank is extruded under conditions that take into account the deformation ability of each layer, preferably with a large extrusion ratio to further strengthen the interlayer bonding. At the same time, by extruding with a large extrusion ratio, further refinement of the second phase and grain refinement can be achieved, thereby improving the strength and plasticity of the alloy.

[0024] In summary, by adopting the friction stir additive manufacturing process, magnesium alloy blanks with different organizations and properties can be combined, and performance differences can be manufactured on both sides of the interface to fully utilize the hetero-deformation induced strengthening and hardening mechanism to improve the strength and plasticity of magnesium alloy, and combined with the extrusion process to form a heterogeneous organization and obtain excellent strength and plasticity, and the design is strong, and flexible regulation of the organization and performance difference of different layers of materials can be realized, and the quality is controllable and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A low-magnification SEM image of a 1# sample in Example 1 of the layered heterogeneous magnesium alloy profile provided by the present application;

[0026] Figure 2 A high-magnification SEM image of a 1# sample in Example 1 of the layered heterogeneous magnesium alloy profile provided by the present application. DETAILED DESCRIPTION

[0027] To make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0028] In recent years, researchers have found that forming a heterogeneous organization is an effective method to synergistically improve the strength and plasticity of an alloy. Heterogeneous organization refers to the existence of heterogeneous components with significant differences in mechanical properties or physical properties within the material, and these components are non-uniformly distributed in space. This non-uniformity can be reflected in grain size, shape, orientation, chemical composition, etc. Heterogeneous organization mainly benefits from the effects of hetero-deformation induced (HDI) strengthening and hardening. Therefore, due to the synergistic effect of the micro-uniform organization, the heterogeneous organization material has better strain hardening effect, so that the material exhibits excellent performance in strength, plasticity, etc., and can realize the synergistic effect of strength and plasticity, providing a new idea for realizing the matching of strength and plasticity. Therefore, this technology has broad application prospects.

[0029] The technical scheme of the present application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0030] In a first aspect, the present application provides a preparation method of a layered heterogeneous magnesium alloy profile, comprising:

[0031] S100, providing a plurality of first magnesium alloy blanks and a plurality of second magnesium alloy blanks;

[0032] The first magnesium alloy blanks and the second magnesium alloy blanks in the embodiment can be of the same material or different materials, and can be of the same thickness or different thicknesses, and both are substantially in the form of a sheet or a thin plate, which facilitates subsequent friction stir additive manufacturing.

[0033] S200, respectively performing solid solution treatment on each of the first magnesium alloy blanks and the second magnesium alloy blanks to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks, and the average grain size of the first pretreated blanks is different from that of the second pretreated blanks;

[0034] In the embodiment, the first magnesium alloy blanks and the second magnesium alloy blanks are respectively subjected to solid solution treatment, the purpose of which is to completely dissolve alloying elements in the magnesium matrix to form a single solid solution, and to obtain a supersaturated solid solution after cooling. However, it should be noted that the average grain size of the first magnesium alloy blanks is coarser or finer than that of the second magnesium alloy blanks after the solid solution treatment, which prepares for the formation of a lamellar heterogeneous structure.

[0035] S300, sequentially and alternately stacking each of the first pretreated blanks and the second pretreated blanks, and combining adjacent first pretreated blanks and second pretreated blanks through a friction stir additive process to obtain a composite blank;

[0036] In the embodiment, the friction stir additive process can combine the interfaces of blank layers with different organizational structures, and fully utilize heterogeneous deformation induced strengthening and hardening mechanisms to improve the strength and plasticity of the magnesium alloy.

[0037] S400, sequentially subjecting the composite blank to extrusion forming and aging treatment to obtain a lamellar heterogeneous magnesium alloy profile.

[0038] In the embodiment, the desired product shape is obtained through extrusion forming, and the strength and hardness of the magnesium alloy are significantly enhanced through aging treatment.

[0039] It can be understood that the application of the preparation method of the lamellar heterogeneous magnesium alloy profile in the embodiment combines magnesium alloy blanks with different organizations and properties through the friction stir additive process, and forms a lamellar heterogeneous structure, so that the magnesium alloy profile obtains excellent strength and plasticity.

[0040] In some embodiments, the rotation speed of the stirring head in the friction stir additive process is 750 rpm to 5000 rpm, and the feed speed is 10 mm / min to 500 mm / min.

[0041] In some embodiments, the temperature in the solid solution treatment is 400℃ to 520℃, and the time length is 8h to 72h.

[0042] In some embodiments, the temperature in the aging treatment is 180-250℃, and the time is 8-100h.

[0043] In some embodiments, the temperature of the composite blank in the extrusion forming is 400-500℃, the temperature of the mold is 300-400℃, the extrusion speed is 0.2-20mm / s, and the extrusion ratio is 5-60:1.

[0044] In some embodiments, after the solid solution treatment of each first magnesium alloy blank and each second magnesium alloy blank respectively, a pre-aging treatment is further performed on each first magnesium alloy blank or each second magnesium alloy blank, at a temperature of 225-400℃ for a time of 8-24h.

[0045] It should be noted that the pre-aging treatment of the first magnesium alloy blank or the second magnesium alloy blank before the friction stir additive manufacturing can form the second phase particles with nanoscale or microscale in the blank in advance, so as to further realize the comprehensive regulation of the microstructure and performance of the blank and ensure the quality and cost of the final product.

[0046] In some embodiments, the first magnesium alloy blank is one of Mg-11Gd-3Y-0.5Nd-Zr, Mg-8Gd-3Y-0.5Nd-Zr and Mg-9Gd-3Y-0.5Nd-Zr.

[0047] In some embodiments, the second magnesium alloy blank is one of Mg-11Gd-3Y-0.5Nd-Zr, Mg-6Gd-3Y-0.5Nd-Zr, AZ31, Mg-8Gd-3Y-0.5Nd-Zr and Mg-9Gd-3Y-0.5Nd-Zr.

[0048] In some embodiments, the thickness of the first magnesium alloy blank and / or the second magnesium alloy blank is 1-9mm.

[0049] In a second aspect, the present application further provides a layered heterogeneous magnesium alloy profile prepared by using any one of the preparation methods of the layered heterogeneous magnesium alloy profile.

[0050] In a third aspect, the present application further provides an application of the layered heterogeneous magnesium alloy profile prepared by using any one of the preparation methods of the layered heterogeneous magnesium alloy profile in the fields of aerospace, transportation and special equipment.

[0051] The present application is further described below through specific examples and comparative examples. Unless otherwise specified, the raw materials and equipment used in the following are conventional raw materials and equipment, which are commercially available, and the alloy materials involved can also be obtained by conventional preparation methods.

[0052] Example 1

[0053] A preparation method of a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0054] S100, cut the Mg-11Gd-3Y-0.5Nd-Zr alloy ingot into several plates with thicknesses of 2mm and 8mm respectively, take the 2mm-thick plate as a first magnesium alloy blank, and take the 8mm-thick plate as a second magnesium alloy blank.

[0055] S200, solid solution treat each first magnesium alloy blank at 520℃ for 8h, and then water cool to obtain a plurality of first pretreated blanks. Solid solution treat each second magnesium alloy blank at 520℃ for 72h, and then water cool to obtain a plurality of second pretreated blanks. The average grain size of the first pretreated blanks is different from that of the second pretreated blanks, that is, the Mg-11Gd-3Y-0.5Nd-Zr alloy plates after treatment have different average grain sizes.

[0056] S300, take the above-mentioned plates after solid solution treatment as raw materials, alternately stack each first pretreated blank and each second pretreated blank, and combine the adjacent first pretreated blank and second pretreated blank through a friction stir additive process, that is, alternately stack the 8mm-thick plate and the 2mm-thick plate layer by layer, the rotation speed of the stirring head in the friction stir additive process is 1200rpm, and the feeding speed is 60mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0057] S400, preheat the above-mentioned composite blank to 500℃, and then perform extrusion forming, the mold temperature is 360℃, the extrusion speed is 2mm / s, and the extrusion ratio is 16. Subsequently, age treatment is performed at 215℃ for 24h to obtain a layered heterogeneous magnesium alloy profile, and a sample is marked as 1#, the microstructure of which is as shown in Figure 1 、 Figure 2 .

[0058] As a comparison, another first magnesium alloy blank is subjected to solid solution treatment at 520℃ for 8h, and then water cooled to obtain a first pretreated blank. The first pretreated blank is preheated to 500℃ and then subjected to extrusion forming, with a die temperature of 360℃, an extrusion speed of 2mm / s, and an extrusion ratio of 16. Subsequently, the magnesium alloy profile is aged at 215℃ for 24h to obtain a magnesium alloy profile, and a sample is marked as 2#. Another second magnesium alloy blank is subjected to solid solution treatment at 520℃ for 72h, and then water cooled to obtain a second pretreated blank. The second pretreated blank is preheated to 500℃ and then subjected to extrusion forming, with a die temperature of 360℃, an extrusion speed of 2mm / s, and an extrusion ratio of 16. Subsequently, the magnesium alloy profile is aged at 215℃ for 24h to obtain a magnesium alloy profile, and a sample is marked as 3#. That is, neither the 2# sample nor the 3# sample is subjected to the friction stir additive process.

[0059] The three samples are subjected to mechanical property tests, including tensile strength, yield strength, and elongation, and the results are shown in Table 1.

[0060] Table 1

[0061]

[0062] As can be seen from Table 1, the tensile strength and yield strength of the 1# sample are higher than those of the 2# and 3# samples, and the 1# sample has a higher elongation of 8.3%, i.e., higher plasticity, and better comprehensive mechanical properties.

[0063] Example 2

[0064] A method for preparing a layered heterogeneous magnesium alloy profile includes the following steps:

[0065] S100, cutting Mg-11Gd-3Y-0.5Nd-Zr and Mg-6Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5mm, taking the Mg-11Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and taking the Mg-6Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0066] S200, respectively subjecting each first magnesium alloy blank and each second magnesium alloy blank to solid solution treatment at 520℃ for 24h, and then water cooling to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. The average grain size of the first pretreated blanks is different from that of the second pretreated blanks, and the alloy element content is also different.

[0067] S300, using the plate after the above solid solution treatment as a raw material, sequentially and alternately stacking each first pretreatment blank and each second pretreatment blank, combining adjacent first pretreatment blanks and second pretreatment blanks through a friction stir additive process, a rotation speed of a stirring head in the friction stir additive process being 1200 rpm, a feed speed being 60 mm / min, to obtain a composite blank, and the composite blank can be machined and used as an extrusion blank.

[0068] S400, preheating the composite blank to 500℃, and then performing extrusion forming, a mold temperature being 360℃, an extrusion speed being 1 mm / s, an extrusion ratio being 16. Subsequently, aging treatment is performed at 215℃ for 24 h to obtain a layered heterogeneous magnesium alloy profile, and a sample is marked as 1#.

[0069] As a comparison, another first magnesium alloy blank and another second magnesium alloy blank are respectively subjected to solid solution treatment at 520℃ for 24 h, and then water cooled to obtain a first pretreatment blank and a second pretreatment blank. The first pretreatment blank and the second pretreatment blank are respectively preheated to 500℃, and then subjected to extrusion forming, a mold temperature being 360℃, an extrusion speed being 2 mm / s, an extrusion ratio being 16. Subsequently, aging treatment is respectively performed at 215℃ for 24 h to obtain magnesium alloy profiles, and samples are respectively marked as 2# and 3#, i.e., the 2# and 3# samples are not subjected to the friction stir additive process.

[0070] Mechanical property tests are performed on the three samples, including tensile strength, yield strength and elongation, etc., and results are shown in Table 2.

[0071] Table 2

[0072]

[0073] As can be seen from Table 2, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample has a higher elongation of 13.7%, i.e., higher plasticity, and has better comprehensive mechanical properties.

[0074] Example 3

[0075] A preparation method of a layered heterogeneous magnesium alloy profile includes the following steps:

[0076] S100, cutting a Mg-11Gd-3Y-0.5Nd-Zr alloy ingot into several plates with a thickness of 5 mm, using a part of the Mg-11Gd-3Y-0.5Nd-Zr plates as a first magnesium alloy blank, and using another part of the Mg-11Gd-3Y-0.5Nd-Zr plates as a second magnesium alloy blank.

[0077] S200, each of the first magnesium alloy blanks is subjected to solid solution treatment at 520°C for 8h, and then water cooled to obtain a plurality of first pretreated blanks. Each of the second magnesium alloy blanks is subjected to solid solution treatment at 520°C for 72h, and then water cooled to obtain a plurality of second pretreated blanks. The average grain size of the first pretreated blanks is different from that of the second pretreated blanks, that is, the Mg-11Gd-3Y-0.5Nd-Zr alloy plates after treatment have different average grain sizes.

[0078] S300, using the plates after the above solid solution treatment as raw materials, each of the first pretreated blanks and each of the second pretreated blanks are alternately stacked in sequence, and the adjacent first pretreated blanks and second pretreated blanks are combined by friction stir additive manufacturing process, the rotation speed of the stirring head in the friction stir additive manufacturing process is 1200 rpm, and the feeding speed is 60 mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0079] S400, the composite blank is preheated to 500°C, and then extrusion forming is performed, the mold temperature is 300°C, the extrusion speed is 1 mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is performed at 215°C for 24h to obtain a layered heterogeneous magnesium alloy profile, and a sample is marked as 1#.

[0080] As a comparison, another first magnesium alloy blank is subjected to solid solution treatment at 520°C for 8h, and then water cooled to obtain a first pretreated blank. The first pretreated blank is preheated to 500°C, and then extrusion forming is performed, the mold temperature is 300°C, the extrusion speed is 1 mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is performed at 215°C for 24h to obtain a magnesium alloy profile, and a sample is marked as 2#. Another second magnesium alloy blank is subjected to solid solution treatment at 520°C for 72h, and then water cooled to obtain a second pretreated blank. The second pretreated blank is preheated to 500°C, and then extrusion forming is performed, the mold temperature is 300°C, the extrusion speed is 1 mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is performed at 215°C for 24h to obtain a magnesium alloy profile, and a sample is marked as 3#, that is, the samples 2# and 3# are not subjected to friction stir additive manufacturing process.

[0081] The three kinds of samples are subjected to mechanical property tests, including tensile strength, yield strength and elongation, etc., and the results are shown in Table 3.

[0082] Table 3

[0083]

[0084] As can be seen from Table 3, the tensile strength and yield strength of the 1# sample are higher than those of the 2# and 3# samples, and the 1# sample has a higher elongation of 9.1%, i.e. higher plasticity, and has better comprehensive mechanical properties.

[0085] Example 4

[0086] A preparation method of a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0087] S100, cutting a Mg-11Gd-3Y-0.5Nd-Zr alloy ingot into several plates with thicknesses of 1 mm and 9 mm respectively, taking the 1 mm thick plate as a first magnesium alloy blank, and taking the 9 mm thick plate as a second magnesium alloy blank.

[0088] S200, solid solution treating each first magnesium alloy blank at 520 DEG C for 8 h and then water cooling to obtain a plurality of first pretreated blanks, and solid solution treating each second magnesium alloy blank at 520 DEG C for 72 h and then water cooling to obtain a plurality of second pretreated blanks, wherein the average grain sizes of the first pretreated blanks and the second pretreated blanks are different, i.e. the Mg-11Gd-3Y-0.5Nd-Zr alloy plates after treatment have different average grain sizes.

[0089] S300, taking the above solid solution treated plates as raw materials, alternately stacking each first pretreated blank and each second pretreated blank, combining the adjacent first pretreated blank and the second pretreated blank through a friction stir additive process, wherein the rotation speed of the stirring head in the friction stir additive process is 1200 rpm, and the feed speed is 60 mm / min, to obtain a composite blank, and the composite blank can be machined and used as an extrusion blank.

[0090] S400, preheating the above composite blank to 500 DEG C and then performing extrusion forming, wherein the mold temperature is 360 DEG C, the extrusion speed is 1 mm / s, and the extrusion ratio is 16, and then aging at 215 DEG C for 24 h to obtain a layered heterogeneous magnesium alloy profile, and taking a sample and marking it as 1#.

[0091] As a comparison, another first magnesium alloy blank is solution treated at 520℃ for 8h, and then water cooled to obtain a first pretreated blank. The first pretreated blank is preheated to 500℃ and then extruded at a die temperature of 360℃ and an extrusion speed of 1mm / s with an extrusion ratio of 16. Subsequently, the magnesium alloy profile is aged at 215℃ for 24h to obtain a magnesium alloy profile, and a sample is labeled as 2#. Another second magnesium alloy blank is solution treated at 520℃ for 72h, and then water cooled to obtain a second pretreated blank. The second pretreated blank is preheated to 500℃ and then extruded at a die temperature of 360℃ and an extrusion speed of 1mm / s with an extrusion ratio of 16. Subsequently, the magnesium alloy profile is aged at 215℃ for 24h to obtain a magnesium alloy profile, and a sample is labeled as 3#. That is, neither the 2# sample nor the 3# sample is subjected to the friction stir additive manufacturing process.

[0092] The three samples are subjected to mechanical property tests, including tensile strength, yield strength and elongation, and the results are shown in Table 4.

[0093] Table 4

[0094]

[0095] As can be seen from Table 4, the tensile strength and yield strength of the 1# sample are higher than those of the 2# and 3# samples, and the 1# sample has a higher elongation of 8.1%, i.e., higher plasticity, and has better comprehensive mechanical properties.

[0096] Example 5

[0097] A method for preparing a layered heterogeneous magnesium alloy profile includes the following steps:

[0098] S100, a Mg-11Gd-3Y-0.5Nd-Zr alloy ingot is cut into several plates with thicknesses of 3mm and 7mm, respectively, the 3mm-thick plates are used as first magnesium alloy blanks, and the 7mm-thick plates are used as second magnesium alloy blanks.

[0099] S200, each first magnesium alloy blank is solution treated at 520℃ for 8h, and then water cooled to obtain a plurality of first pretreated blanks. Each second magnesium alloy blank is solution treated at 520℃ for 72h, and then water cooled to obtain a plurality of second pretreated blanks. The average grain size of the first pretreated blanks is different from that of the second pretreated blanks, i.e., the Mg-11Gd-3Y-0.5Nd-Zr alloy plates after treatment have different average grain sizes.

[0100] S300, using the plate after the above solid solution treatment as a raw material, sequentially and alternately stacking each first pretreatment blank and each second pretreatment blank, combining adjacent first pretreatment blanks and second pretreatment blanks through a friction stir additive process, the rotation speed of a stirring head in the friction stir additive process being 1200 rpm, the feed speed being 60 mm / min, to obtain a composite blank, and the composite blank can be machined and used as an extrusion blank.

[0101] S400, preheating the composite blank to 500℃, and then performing extrusion forming, the die temperature being 400℃, the extrusion speed being 1 mm / s, and the extrusion ratio being 16. Subsequently, aging treatment is performed at 215℃ for 24 h to obtain a layered heterogeneous magnesium alloy profile, and a sample is marked as 1#.

[0102] As a comparison, another first magnesium alloy blank is subjected to solid solution treatment at 520℃ for 8 h, and then water cooled to obtain a first pretreatment blank. The first pretreatment blank is preheated to 500℃, and then subjected to extrusion forming, the die temperature being 400℃, the extrusion speed being 1 mm / s, and the extrusion ratio being 16. Subsequently, aging treatment is performed at 215℃ for 24 h to obtain a magnesium alloy profile, and a sample is marked as 2#. Another second magnesium alloy blank is subjected to solid solution treatment at 520℃ for 72 h, and then water cooled to obtain a second pretreatment blank. The second pretreatment blank is preheated to 500℃, and then subjected to extrusion forming, the die temperature being 400℃, the extrusion speed being 1 mm / s, and the extrusion ratio being 16. Subsequently, aging treatment is performed at 215℃ for 24 h to obtain a magnesium alloy profile, and a sample is marked as 3#, i.e., neither the 2# sample nor the 3# sample uses the friction stir additive process.

[0103] The three kinds of samples are subjected to mechanical property tests, including tensile strength, yield strength and elongation, etc., and the results are shown in Table 5.

[0104] Table 5

[0105]

[0106] As can be seen from Table 5, the tensile strength and yield strength of the 1# sample are higher than those of the 2# and 3# samples, and the 1# sample has a higher elongation of 8.5%, i.e., higher plasticity, and has better comprehensive mechanical properties.

[0107] Example 6

[0108] A preparation method of a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0109] S100, cut the Mg-11Gd-3Y-0.5Nd-Zr and AZ31 alloy ingots into several plates with a thickness of 5 mm, take the Mg-11Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and take the AZ31 plate as a second magnesium alloy blank.

[0110] S200, respectively, solid-solution treat each first magnesium alloy blank at 520°C for 24 h, and then water cool to obtain a plurality of first pretreated blanks. Respectively, solid-solution treat each second magnesium alloy blank at 400°C for 12 h, and then water cool to obtain a plurality of second pretreated blanks. The average grain size of the first pretreated blanks is different from that of the second pretreated blanks, and the alloy element content and type are also different.

[0111] S300, using the above-mentioned plates after solid-solution treatment as raw materials, alternately stack each first pretreated blank and each second pretreated blank, combine the adjacent first pretreated blank and second pretreated blank through a friction stir additive manufacturing process, the rotation speed of the stirring head in the friction stir additive manufacturing process is 1000 rpm, and the feeding speed is 100 mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0112] S400, preheat the above-mentioned composite blank to 400°C, and then perform extrusion forming, the mold temperature is 320°C, the extrusion speed is 20 mm / s, and the extrusion ratio is 16. Subsequently, age treatment is performed at 215°C for 24 h to obtain a layered heterogeneous magnesium alloy profile, and a sample is taken and marked as 1#.

[0113] As a comparison, another first magnesium alloy blank is solid-solution treated at 520°C for 24 h, and then water cooled to obtain a first pretreated blank. The above-mentioned first pretreated blank is preheated to 400°C, and then extrusion forming is performed, the mold temperature is 320°C, the extrusion speed is 20 mm / s, and the extrusion ratio is 16. Subsequently, age treatment is performed at 215°C for 24 h to obtain a magnesium alloy profile, and a sample is taken and marked as 2#. Another second magnesium alloy blank is solid-solution treated at 400°C for 12 h, and then water cooled to obtain a second pretreated blank. The above-mentioned second pretreated blank is preheated to 400°C, and then extrusion forming is performed, the mold temperature is 320°C, the extrusion speed is 20 mm / s, and the extrusion ratio is 16. Subsequently, age treatment is performed at 215°C for 24 h to obtain a magnesium alloy profile, and a sample is taken and marked as 3#, i.e., the 2# and 3# samples do not use the friction stir additive manufacturing process.

[0114] Mechanical property tests are performed on the above-mentioned three samples, including tensile strength, yield strength, and elongation, etc., and the results are shown in Table 6.

[0115] Table 6

[0116]

[0117] As can be seen from Table 6, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample has a higher elongation of 18.2%, i.e. higher plasticity, and has better comprehensive mechanical properties.

[0118] Example 7

[0119] A preparation method of a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0120] S100, cutting Mg-11Gd-3Y-0.5Nd-Zr and Mg-8Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5 mm, taking the Mg-11Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and taking the Mg-8Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0121] S200, respectively performing solid solution treatment on each first magnesium alloy blank and each second magnesium alloy blank at 520℃ for 24h, and then water cooling to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. The average grain size of the first pretreated blank is different from that of the second pretreated blank, and the alloy element content is also different.

[0122] S300, taking the above-mentioned plates after solid solution treatment as raw materials, alternately stacking each first pretreated blank and each second pretreated blank, combining adjacent first pretreated blanks and second pretreated blanks through a friction stir additive process, the rotation speed of the stirring head in the friction stir additive process being 1200rpm, and the feeding speed being 60mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0123] S400, preheating the above-mentioned composite blank to 500℃, and then performing extrusion forming, the mold temperature being 360℃, the extrusion speed being 1mm / s, and the extrusion ratio being 16. Subsequently, aging treatment is performed at 215℃ for 24h to obtain a layered heterogeneous magnesium alloy profile, and a sample is taken and marked as 1#.

[0124] As a comparison, another first magnesium alloy blank and another second magnesium alloy blank are respectively subjected to solid solution treatment at 520℃ for 24h, and then water cooled to obtain a first pretreated blank and a second pretreated blank. The first pretreated blank and the second pretreated blank are respectively preheated to 500℃, and then subjected to extrusion forming, the mold temperature being 360℃, the extrusion speed being 1mm / s, and the extrusion ratio being 16. Subsequently, aging treatment is respectively performed at 215℃ for 24h to obtain magnesium alloy profiles, and samples are respectively taken and marked as 2# and 3#, i.e. the 2# and 3# samples do not use the friction stir additive process.

[0125] The mechanical properties of the three samples were tested, including tensile strength, yield strength and elongation, and the results are shown in Table 7.

[0126] Table 7

[0127]

[0128] As can be seen from Table 7, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample has a higher elongation of 12.2%, i.e. higher plasticity, and better overall mechanical properties.

[0129] Example 8

[0130] A method for preparing a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0131] S100, cutting Mg-11Gd-3Y-0.5Nd-Zr and Mg-9Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5mm, taking the Mg-11Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and taking the Mg-9Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0132] S200, respectively, the first magnesium alloy blanks and the second magnesium alloy blanks are subjected to solid solution treatment at 520℃ for 24h, and then water-cooled, to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. The average grain size of the first pretreated blanks is different from that of the second pretreated blanks, and the alloy element content is also different.

[0133] S300, using the above-mentioned plates after solid solution treatment as raw materials, the first pretreated blanks and the second pretreated blanks are alternately stacked in sequence, so that the adjacent first pretreated blanks and second pretreated blanks are combined by friction stir additive manufacturing process, the rotation speed of the stirring head in the friction stir additive manufacturing process is 1200rpm, and the feeding speed is 60mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0134] S400, the above-mentioned composite blank is preheated to 500℃, and then extrusion formed, the mold temperature is 360℃, the extrusion speed is 1mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is performed at 215℃ for 24h, to obtain a layered heterogeneous magnesium alloy profile, and a sample is taken and marked as 1#.

[0135] As a comparison, another first magnesium alloy blank and another second magnesium alloy blank are respectively subjected to solid solution treatment at 520℃ for 24h, and then water-cooled to obtain a first pretreated blank and a second pretreated blank. The first pretreated blank and the second pretreated blank are respectively preheated to 500℃, and then subjected to extrusion forming at a die temperature of 360℃ and an extrusion speed of 1mm / s, and an extrusion ratio of 16. Subsequently, the magnesium alloy profiles are respectively aged at 215℃ for 24h to obtain a magnesium alloy profile, and samples are respectively taken and marked as 2# and 3#, i.e., the 2# and 3# samples are not subjected to the friction stir additive process.

[0136] The three samples are subjected to mechanical property tests, including tensile strength, yield strength and elongation, and the results are shown in Table 8.

[0137] Table 8

[0138]

[0139] As can be seen from Table 8, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample has a higher elongation of 10.1%, i.e., higher plasticity, and better comprehensive mechanical properties.

[0140] Example 9

[0141] A method for preparing a layered heterogeneous magnesium alloy profile includes the following steps:

[0142] S100, cutting Mg-9Gd-3Y-0.5Nd-Zr and Mg-8Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5mm, taking the Mg-9Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and taking the Mg-8Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0143] S200, respectively subjecting each first magnesium alloy blank and each second magnesium alloy blank to solid solution treatment at 520℃ for 24h, and then water-cooled to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. The average grain size of the first pretreated blank is different from that of the second pretreated blank, and the alloy element content is also different.

[0144] S300, taking the above-mentioned solid solution treated plates as raw materials, alternately stacking each first pretreated blank and each second pretreated blank, combining adjacent first pretreated blanks and second pretreated blanks through a friction stir additive process, and obtaining a composite blank, and the composite blank can be machined and used as an extrusion blank.

[0145] S400, preheat the composite blank to 500℃, and then perform extrusion forming, with a mold temperature of 360℃, an extrusion speed of 1mm / s, and an extrusion ratio of 16. Subsequently, age treatment is performed at 215℃ for 24h, to obtain a laminated isomeric magnesium alloy profile, and a sample is marked as 1#.

[0146] As a comparison, another first magnesium alloy blank and another second magnesium alloy blank are separately subjected to solid solution treatment at 520℃ for 24h, and then water cooled, to obtain a first pretreated blank and a second pretreated blank. The first pretreated blank and the second pretreated blank are separately preheated to 500℃, and then perform extrusion forming, with a mold temperature of 360℃, an extrusion speed of 1mm / s, and an extrusion ratio of 16. Subsequently, age treatment is performed at 215℃ for 24h, to obtain magnesium alloy profiles, and samples are marked as 2# and 3# respectively, i.e., the 2# and 3# samples are not subjected to friction stir additive manufacturing.

[0147] The three samples are subjected to mechanical property tests, including tensile strength, yield strength, and elongation, etc., and the results are shown in Table 9.

[0148] Table 9

[0149]

[0150] As can be seen from Table 9, the tensile strength and yield strength of the 1# sample are higher than those of the 2# and 3# samples, and the 1# sample has a higher elongation of 12.1%, i.e., higher plasticity, and has better comprehensive mechanical properties.

[0151] Example 10

[0152] A method for preparing a laminated isomeric magnesium alloy profile, comprising the following steps:

[0153] S100, cut Mg-9Gd-3Y-0.5Nd-Zr and Mg-6Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5mm, take the Mg-9Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and take the Mg-6Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0154] S200, separately subject each first magnesium alloy blank and each second magnesium alloy blank to solid solution treatment at 520℃ for 24h, and then water cooled, to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. The average grain size of the first pretreated blank is different from that of the second pretreated blank, and the alloy element content is also different.

[0155] S300, using the plate material after the above solid solution treatment as a raw material, sequentially and alternately stacking each first pretreatment blank and each second pretreatment blank, combining adjacent first pretreatment blanks and second pretreatment blanks by a friction stir additive process, a rotation speed of a stirring head in the friction stir additive process being 1200 rpm, a feed speed being 60 mm / min, to obtain a composite blank, and the composite blank can be machined to be used as an extrusion blank.

[0156] S400, preheating the composite blank to a condition of 500 ℃ and then performing extrusion forming, a die temperature being 360 ℃, an extrusion speed being 1 mm / s, an extrusion ratio being 16. Subsequently, aging treatment is performed at a condition of 215 ℃ for 24 h to obtain a layered heterostructure magnesium alloy profile, and a sample is taken and marked as 1#.

[0157] As a comparison, another first magnesium alloy blank and another second magnesium alloy blank are respectively subjected to solid solution treatment at a condition of 520 ℃ for 24 h, and then water cooled to obtain a first pretreatment blank and a second pretreatment blank. The first pretreatment blank and the second pretreatment blank are respectively preheated to a condition of 500 ℃ and then subjected to extrusion forming, a die temperature being 360 ℃, an extrusion speed being 1 mm / s, an extrusion ratio being 16. Subsequently, aging treatment is respectively performed at a condition of 215 ℃ for 24 h to obtain magnesium alloy profiles, and samples are respectively taken and marked as 2# and 3#, i.e., the 2# and 3# samples do not use the friction stir additive process.

[0158] Mechanical property tests are performed on the three samples, including tensile strength, yield strength and elongation, etc., and results are shown in Table 10.

[0159] Table 10

[0160]

[0161] As can be seen from Table 10, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample obtains a higher elongation of 14.4%, i.e., the plasticity is higher, and the 1# sample has better comprehensive mechanical properties.

[0162] Example 11

[0163] A preparation method of a layered heterostructure magnesium alloy profile includes the following steps:

[0164] S100, cutting Mg-8Gd-3Y-0.5Nd-Zr and Mg-6Gd-3Y-0.5Nd-Zr alloy ingots into several plate materials with a thickness of 5 mm, taking the Mg-8Gd-3Y-0.5Nd-Zr plate material as a first magnesium alloy blank, and taking the Mg-6Gd-3Y-0.5Nd-Zr plate material as a second magnesium alloy blank.

[0165] S200, each first magnesium alloy blank and each second magnesium alloy blank is respectively subjected to solid solution treatment at 520°C for 24h, and then water cooled to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. Among them, the average grain size of the first pretreated blank and the second pretreated blank is different, and the alloy element content is also different.

[0166] S300, using the above-mentioned plate material after solid solution treatment as raw material, each first pretreated blank and each second pretreated blank is alternately stacked in sequence, so that the adjacent first pretreated blank and second pretreated blank are combined by friction stir additive process, the rotation speed of the stirring head in the friction stir additive process is 1200rpm, and the feeding speed is 60mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0167] S400, the above-mentioned composite blank is preheated to 500°C and then extrusion formed, the mold temperature is 360°C, the extrusion speed is 1mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is carried out at 215°C for 24h to obtain a layered heterogeneous magnesium alloy profile, and a sample is marked as 1#.

[0168] As a comparison, another first magnesium alloy blank and another second magnesium alloy blank are respectively subjected to solid solution treatment at 520°C for 24h, and then water cooled to obtain a first pretreated blank and a second pretreated blank. The above-mentioned first pretreated blank and second pretreated blank are respectively preheated to 500°C and then extrusion formed, the mold temperature is 360°C, the extrusion speed is 1mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is carried out at 215°C for 24h to obtain a magnesium alloy profile, and a sample is marked as 2# and 3# respectively, that is, 2# and 3# samples do not use friction stir additive process.

[0169] The above-mentioned three kinds of samples are subjected to mechanical property test, including tensile strength, yield strength and elongation rate, etc., and the results are shown in Table 11.

[0170] Table 11

[0171]

[0172] As can be seen from Table 11, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample obtains a higher elongation rate of 15.5%, that is, the plasticity is higher, and has better comprehensive mechanical properties.

[0173] Example 12

[0174] A preparation method of a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0175] S100, cut the Mg-11Gd-3Y-0.5Nd-Zr and Mg-6Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5 mm, take the Mg-11Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and take the Mg-6Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0176] S200, respectively, the first magnesium alloy blanks and the second magnesium alloy blanks are subjected to solid solution treatment at 520°C for 24 h, and then water-cooled to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. The average grain size of the first pretreated blanks is different from that of the second pretreated blanks, and the alloy element content is also different.

[0177] S300, using the above-mentioned plates subjected to solid solution treatment as raw materials, the first pretreated blanks and the second pretreated blanks are alternately stacked in sequence, and the adjacent first pretreated blanks and second pretreated blanks are combined by friction stir additive manufacturing process, the rotation speed of the stirring head in the friction stir additive manufacturing process is 5000 rpm, and the feeding speed is 350 mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0178] S400, the above-mentioned composite blank is preheated to 500°C and then subjected to extrusion forming, the mold temperature is 360°C, the extrusion speed is 1 mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is performed at 215°C for 24 h to obtain a layered heterogeneous magnesium alloy profile, and a sample is marked as 1#.

[0179] As a comparison, the first magnesium alloy blanks and the second magnesium alloy blanks are respectively subjected to solid solution treatment at 520°C for 24 h, and then water-cooled to obtain first pretreated blanks and second pretreated blanks. The above-mentioned first pretreated blanks and second pretreated blanks are respectively preheated to 500°C and then subjected to extrusion forming, the mold temperature is 360°C, the extrusion speed is 1 mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is performed at 215°C for 24 h to obtain magnesium alloy profiles, and samples are respectively marked as 2# and 3#, i.e., the 2# and 3# samples do not use the friction stir additive manufacturing process.

[0180] The above-mentioned three kinds of samples are subjected to mechanical property tests, including tensile strength, yield strength and elongation, etc., and the results are shown in Table 12.

[0181] Table 12

[0182]

[0183] As can be seen from Table 12, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample has a higher elongation of 12.5%, i.e. higher plasticity, and has better comprehensive mechanical properties.

[0184] Example 13

[0185] A preparation method of a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0186] S100, cutting Mg-9Gd-3Y-0.5Nd-Zr and Mg-8Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5 mm, taking the Mg-9Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and taking the Mg-8Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0187] S200, respectively performing solid solution treatment on each first magnesium alloy blank and each second magnesium alloy blank at 520℃ for 24h, and then water cooling to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. The average grain size of the first pretreated blank is different from that of the second pretreated blank, and the alloy element content is also different.

[0188] S300, taking the above-mentioned plates after solid solution treatment as raw materials, alternately stacking each first pretreated blank and each second pretreated blank, combining adjacent first pretreated blanks and second pretreated blanks through a friction stir additive process, the rotation speed of the stirring head in the friction stir additive process being 750rpm, and the feeding speed being 25mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0189] S400, preheating the above-mentioned composite blank to 500℃, and then performing extrusion forming, the mold temperature being 360℃, the extrusion speed being 1mm / s, and the extrusion ratio being 16. Subsequently, aging treatment is performed at 215℃ for 24h to obtain a layered heterogeneous magnesium alloy profile, and a sample is taken and marked as 1#.

[0190] As a comparison, another first magnesium alloy blank and another second magnesium alloy blank are respectively subjected to solid solution treatment at 520℃ for 24h, and then water cooled to obtain a first pretreated blank and a second pretreated blank. The first pretreated blank and the second pretreated blank are respectively preheated to 500℃, and then subjected to extrusion forming, the mold temperature being 360℃, the extrusion speed being 1mm / s, and the extrusion ratio being 16. Subsequently, aging treatment is respectively performed at 215℃ for 24h to obtain magnesium alloy profiles, and samples are respectively taken and marked as 2# and 3#, i.e. the 2# and 3# samples do not use the friction stir additive process.

[0191] The mechanical properties of the three samples were tested, including tensile strength, yield strength and elongation, etc., and the results are shown in Table 13.

[0192] Table 13

[0193]

[0194] As can be seen from Table 13, the tensile strength and yield strength of the 1# sample are higher than those of the 2# and 3# samples, and the 1# sample has a higher elongation of 12.1%, i.e. higher plasticity, and better comprehensive mechanical properties.

[0195] Example 14

[0196] A preparation method of a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0197] S100, cutting Mg-11Gd-3Y-0.5Nd-Zr and Mg-9Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5mm, taking the Mg-11Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and taking the Mg-9Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0198] S200, respectively, the first magnesium alloy blanks and the second magnesium alloy blanks are subjected to solid solution treatment at 520℃ for 24h, and then water-cooled, to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. The average grain size of the first pretreated blanks is different from that of the second pretreated blanks, and the alloy element content is also different.

[0199] S300, using the above-mentioned plates after solid solution treatment as raw materials, the first pretreated blanks and the second pretreated blanks are alternately stacked in sequence, so that the adjacent first pretreated blanks and second pretreated blanks are combined by friction stir additive manufacturing process, the rotation speed of the stirring head in the friction stir additive manufacturing process is 1200rpm, and the feeding speed is 10mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0200] S400, the above-mentioned composite blank is preheated to 500℃, and then extrusion forming is carried out, the mold temperature is 360℃, the extrusion speed is 1mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is carried out at 250℃ for 8h, to obtain a layered heterogeneous magnesium alloy profile, and a sample is taken and marked as 1#.

[0201] As a comparison, another first magnesium alloy blank and another second magnesium alloy blank are respectively subjected to solid solution treatment at 520℃ for 24h, and then water-cooled to obtain a first pretreated blank and a second pretreated blank. The first pretreated blank and the second pretreated blank are respectively preheated to 500℃, and then subjected to extrusion forming at a die temperature of 360℃ and an extrusion speed of 1mm / s, and an extrusion ratio of 16. Subsequently, the magnesium alloy profiles are respectively aged at 250℃ for 8h to obtain a magnesium alloy profile, and samples are respectively taken and marked as 2# and 3#, i.e., the 2# and 3# samples are not subjected to the friction stir additive process.

[0202] The three samples are subjected to mechanical property tests, including tensile strength, yield strength and elongation, and the results are shown in Table 14.

[0203] Table 14

[0204]

[0205] As can be seen from Table 14, the tensile strength and yield strength of the 1# sample are higher than those of the 2# and 3# samples, and the 1# sample has a higher elongation of 13.1%, i.e., higher plasticity, and has better comprehensive mechanical properties.

[0206] Example 15

[0207] A method for preparing a layered heterogeneous magnesium alloy profile includes the following steps:

[0208] S100, the Mg-11Gd-3Y-0.5Nd-Zr and AZ31 alloy ingots are cut into several plates with a thickness of 5mm, the Mg-11Gd-3Y-0.5Nd-Zr plate is used as a first magnesium alloy blank, and the AZ31 plate is used as a second magnesium alloy blank.

[0209] S200, each first magnesium alloy blank is subjected to solid solution treatment at 520℃ for 24h, and then water-cooled to obtain a plurality of first pretreated blanks. Each second magnesium alloy blank is subjected to solid solution treatment at 400℃ for 12h, and then water-cooled to obtain a plurality of second pretreated blanks. The average grain size of the first pretreated blank is different from that of the second pretreated blank, and the alloy element content and type are also different.

[0210] S300, using the above solid solution treated plates as raw materials, the first pretreated blanks and the second pretreated blanks are alternately stacked in sequence, and the adjacent first pretreated blanks and second pretreated blanks are combined by the friction stir additive process, the rotation speed of the stirring head in the friction stir additive process is 950rpm, and the feed speed is 260mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0211] S400, the composite blank is preheated to 400℃, and then extrusion forming is performed, the die temperature is 360℃, the extrusion speed is 0.2mm / s, and the extrusion ratio is 60. Subsequently, aging treatment is performed at 180℃ for 100h, to obtain a layered isomeric magnesium alloy profile, and a sample is taken and marked as 1#.

[0212] As a comparison, another first magnesium alloy blank is subjected to solid solution treatment at 520℃ for 24h, and then water cooling is performed, to obtain a first pretreated blank. The first pretreated blank is preheated to 400℃, and then extrusion forming is performed, the die temperature is 360℃, the extrusion speed is 0.2mm / s, and the extrusion ratio is 60. Subsequently, aging treatment is performed at 180℃ for 100h, to obtain a magnesium alloy profile, and a sample is taken and marked as 2#. Another second magnesium alloy blank is subjected to solid solution treatment at 400℃ for 12h, and then water cooling is performed, to obtain a second pretreated blank. The second pretreated blank is preheated to 400℃, and then extrusion forming is performed, the die temperature is 360℃, the extrusion speed is 0.2mm / s, and the extrusion ratio is 60. Subsequently, aging treatment is performed at 180℃ for 100h, to obtain a magnesium alloy profile, and a sample is taken and marked as 3#, i.e. neither the 2# sample nor the 3# sample is subjected to the friction stir additive process.

[0213] The three samples are subjected to mechanical property tests, including tensile strength, yield strength and elongation, etc., and the results are shown in Table 15.

[0214] Table 15

[0215]

[0216] As can be seen from Table 15, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample has a higher elongation of 14.8%, i.e. higher plasticity, and has better comprehensive mechanical properties.

[0217] Example 16

[0218] A method for preparing a layered isomeric magnesium alloy profile, comprising the following steps:

[0219] S100, Mg-11Gd-3Y-0.5Nd-Zr and Mg-8Gd-3Y-0.5Nd-Zr alloy ingots are cut into several plates with a thickness of 5mm, the Mg-11Gd-3Y-0.5Nd-Zr plate is taken as a first magnesium alloy blank, and the Mg-8Gd-3Y-0.5Nd-Zr plate is taken as a second magnesium alloy blank.

[0220] S200, each first magnesium alloy blank and each second magnesium alloy blank is respectively subjected to solid solution treatment at 520°C for 24h, and then water cooled to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. Among them, the average grain size of the first pretreated blank and the second pretreated blank is different, and the alloy element content is also different.

[0221] S300, using the above-mentioned plate material after solid solution treatment as raw material, each first pretreated blank and each second pretreated blank is alternately stacked in sequence, so that the adjacent first pretreated blank and second pretreated blank are combined by friction stir additive process, the rotation speed of the stirring head in the friction stir additive process is 1200rpm, and the feeding speed is 500mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0222] S400, the above-mentioned composite blank is preheated to 500°C and then extrusion formed, the mold temperature is 360°C, the extrusion speed is 1mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is carried out at 215°C for 24h to obtain a layered heterogeneous magnesium alloy profile, and a sample is marked as 1#.

[0223] As a comparison, another first magnesium alloy blank and another second magnesium alloy blank are respectively subjected to solid solution treatment at 520°C for 24h, and then water cooled to obtain a first pretreated blank and a second pretreated blank. The above-mentioned first pretreated blank and second pretreated blank are respectively preheated to 500°C and then extrusion formed, the mold temperature is 360°C, the extrusion speed is 1mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is carried out at 215°C for 24h to obtain a magnesium alloy profile, and a sample is marked as 2# and 3# respectively, that is, 2# and 3# samples do not use friction stir additive process.

[0224] The above-mentioned three kinds of samples are subjected to mechanical property test, including tensile strength, yield strength and elongation rate, etc., and the results are shown in Table 16.

[0225] Table 16

[0226]

[0227] As can be seen from Table 16, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample obtains a higher elongation rate of 11.8%, that is, the plasticity is higher, and has better comprehensive mechanical properties.

[0228] Example 17

[0229] A preparation method of a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0230] S100, cut the Mg-11Gd-3Y-0.5Nd-Zr and AZ31 alloy ingots into several plates with a thickness of 5 mm, take the Mg-11Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and take the AZ31 plate as a second magnesium alloy blank.

[0231] S200, solid solution treat each first magnesium alloy blank at 520℃ for 24h, and then water cool to obtain a plurality of first pretreated blanks. Solid solution treat each second magnesium alloy blank at 400℃ for 12h, and then water cool to obtain a plurality of second pretreated blanks. The average grain size of the first pretreated blank is different from that of the second pretreated blank, and the alloy element content and type are also different.

[0232] S300, take the above-mentioned plates after solid solution treatment as raw materials, alternately stack each first pretreated blank and each second pretreated blank, combine the adjacent first pretreated blank and second pretreated blank through a friction stir additive manufacturing process, the rotation speed of the stirring head in the friction stir additive manufacturing process is 1000 rpm, and the feeding speed is 100 mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0233] S400, preheat the above-mentioned composite blank to 400℃, and then perform extrusion forming, the mold temperature is 360℃, the extrusion speed is 1mm / s, and the extrusion ratio is 45. Subsequently, age treatment is performed at 215℃ for 24h to obtain a layered heterogeneous magnesium alloy profile, and a sample is taken and marked as 1#.

[0234] As a comparison, another first magnesium alloy blank is solid solution treated at 520℃ for 24h, and then water cooled to obtain a first pretreated blank. The above-mentioned first pretreated blank is preheated to 400℃, and then extrusion forming is performed, the mold temperature is 360℃, the extrusion speed is 1mm / s, and the extrusion ratio is 45. Subsequently, age treatment is performed at 215℃ for 24h to obtain a magnesium alloy profile, and a sample is taken and marked as 2#. Another second magnesium alloy blank is solid solution treated at 400℃ for 12h, and then water cooled to obtain a second pretreated blank. The above-mentioned second pretreated blank is preheated to 400℃, and then extrusion forming is performed, the mold temperature is 360℃, the extrusion speed is 1mm / s, and the extrusion ratio is 45. Subsequently, age treatment is performed at 215℃ for 24h to obtain a magnesium alloy profile, and a sample is taken and marked as 3#, i.e., the 2# and 3# samples do not use the friction stir additive manufacturing process.

[0235] Mechanical property tests are performed on the above-mentioned three samples, including tensile strength, yield strength, and elongation, etc., and the results are shown in Table 17.

[0236] Table 17

[0237]

[0238] As can be seen from Table 17, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample has a higher elongation of 14.9%, i.e., higher plasticity, and has better comprehensive mechanical properties.

[0239] Example 18

[0240] A preparation method of a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0241] S100, cutting Mg-11Gd-3Y-0.5Nd-Zr and Mg-9Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5 mm, taking the Mg-11Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and taking the Mg-9Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0242] S200, respectively performing solid solution treatment on each first magnesium alloy blank and each second magnesium alloy blank at 520℃ for 24h, and then water cooling to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. The average grain size of the first pretreated blank is different from that of the second pretreated blank, and the alloy element content is also different.

[0243] S300, taking the above-mentioned plates after solid solution treatment as raw materials, alternately stacking each first pretreated blank and each second pretreated blank, combining adjacent first pretreated blanks and second pretreated blanks through a friction stir additive process, the rotation speed of the stirring head in the friction stir additive process being 1200rpm, and the feeding speed being 60mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0244] S400, preheating the above-mentioned composite blank to 500℃, and then performing extrusion forming, the mold temperature being 360℃, the extrusion speed being 15mm / s, and the extrusion ratio being 16. Subsequently, aging treatment is performed at 215℃ for 24h to obtain a layered heterogeneous magnesium alloy profile, and a sample is taken and marked as 1#.

[0245] As a comparison, the first magnesium alloy blank and the second magnesium alloy blank are respectively subjected to solid solution treatment at 520℃ for 24h, and then water cooled to obtain a first pretreated blank and a second pretreated blank. The first pretreated blank and the second pretreated blank are respectively preheated to 500℃, and then subjected to extrusion forming, the mold temperature being 360℃, the extrusion speed being 15mm / s, and the extrusion ratio being 16. Subsequently, aging treatment is respectively performed at 215℃ for 24h to obtain magnesium alloy profiles, and samples are respectively taken and marked as 2# and 3#, i.e., the 2# and 3# samples do not use the friction stir additive process.

[0246] The mechanical properties of the three samples were tested, including tensile strength, yield strength and elongation, and the results are shown in Table 18.

[0247] Table 18

[0248]

[0249] As can be seen from Table 18, the tensile strength and yield strength of the 1# sample are higher than those of the 2# and 3# samples, and the 1# sample has a higher elongation of 8.6%, i.e. higher plasticity, and has better comprehensive mechanical properties.

[0250] Example 19

[0251] A method for preparing a layered heterogeneous magnesium alloy profile includes the following steps:

[0252] S100, cutting a Mg-11Gd-3Y-0.5Nd-Zr alloy ingot into several plates with thicknesses of 1 mm and 9 mm respectively, taking the 1 mm thick plate as a first magnesium alloy blank, and taking the 9 mm thick plate as a second magnesium alloy blank.

[0253] S200, solid solution treating each first magnesium alloy blank at 520℃ for 8h, followed by water cooling, and pre-aging at 400℃ for 8h to form coarse second phases in the blank, to obtain a plurality of first pretreated blanks. Solid solution treating each second magnesium alloy blank at 520℃ for 8h, followed by water cooling, to obtain a plurality of second pretreated blanks. The average grain size of the first pretreated blank is different from that of the second pretreated blank, and the characteristics of the second phase are also different, that is, the Mg-11Gd-3Y-0.5Nd-Zr alloy plates after treatment have different average grain sizes and second phase characteristics.

[0254] S300, using the above solid solution treated plates as raw materials, alternately stacking each first pretreated blank and each second pretreated blank, combining the adjacent first pretreated blank and second pretreated blank by friction stir additive manufacturing process, the rotation speed of the stirring head in the friction stir additive manufacturing process is 1200 rpm, and the feed rate is 60 mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0255] S400, preheating the above composite blank to 420℃, and then extruding and forming, the mold temperature is 360℃, the extrusion speed is 1mm / s, and the extrusion ratio is 16. Subsequently, aging at 215℃ for 24h to obtain a layered heterogeneous magnesium alloy profile, and taking a sample marked as 1#.

[0256] As a comparison, another first magnesium alloy blank was solid solution treated at 520℃ for 8h, and then water cooled to obtain a first pretreated blank. The first pretreated blank was preheated to 420℃ and then extruded, with a die temperature of 360℃, an extrusion speed of 1mm / s, and an extrusion ratio of 16. Subsequently, the magnesium alloy profile was aged at 215℃ for 24h to obtain a magnesium alloy profile, and a sample was taken and marked as 2#. Another second magnesium alloy blank was solid solution treated at 520℃ for 8h, and then water cooled, and aged at 400℃ for 8h to obtain a second pretreated blank. The second pretreated blank was preheated to 420℃ and then extruded, with a die temperature of 360℃, an extrusion speed of 1mm / s, and an extrusion ratio of 16. Subsequently, the magnesium alloy profile was aged at 215℃ for 24h to obtain a magnesium alloy profile, and a sample was taken and marked as 3#. That is, neither the 2# sample nor the 3# sample was subjected to the friction stir additive manufacturing process.

[0257] The three samples were subjected to mechanical property tests, including tensile strength, yield strength, and elongation, and the results are shown in Table 19.

[0258] Table 19

[0259]

[0260] As can be seen from Table 19, the tensile strength and yield strength of the 1# sample are higher than those of the 2# and 3# samples, and the 1# sample has a higher elongation of 13.1%, i.e., higher plasticity, and better comprehensive mechanical properties.

[0261] Example 20

[0262] A method for preparing a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0263] S100, cutting Mg-11Gd-3Y-0.5Nd-Zr and Mg-9Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5mm, taking the Mg-11Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and taking the Mg-9Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0264] S200, each of the first magnesium alloy blanks is subjected to solid solution treatment at 520°C for 8h, and then water cooled to obtain a plurality of first pretreated blanks. Each of the second magnesium alloy blanks is subjected to solid solution treatment at 520°C for 8h, and then water cooled, and subjected to pre-aging treatment at 225°C for 24h to form coarse second phase in the blank to obtain a plurality of second pretreated blanks. The average grain size of the first pretreated blanks and the second pretreated blanks is different, that is, the Mg-11Gd-3Y-0.5Nd-Zr alloy plate after treatment has different average grain sizes and different alloy element contents.

[0265] S300, using the above-mentioned plate after solid solution treatment as raw material, each of the first pretreated blanks and each of the second pretreated blanks is alternately stacked to combine adjacent first pretreated blanks and second pretreated blanks by friction stir additive manufacturing process, the rotation speed of the stirring head in the friction stir additive manufacturing process is 860 rpm, and the feeding speed is 60 mm / min to obtain a composite blank, which can be machined and used as an extrusion blank.

[0266] S400, the composite blank is preheated to 420°C and then extrusion formed, the mold temperature is 360°C, the extrusion speed is 1 mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is performed at 215°C for 24h to obtain a layered heterogeneous magnesium alloy profile, and a sample is marked as 1#.

[0267] As a comparison, another first magnesium alloy blank is subjected to solid solution treatment at 520°C for 8h, and then water cooled to obtain a first pretreated blank. The first pretreated blank is preheated to 420°C and then extrusion formed, the mold temperature is 360°C, the extrusion speed is 1 mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is performed at 215°C for 24h to obtain a magnesium alloy profile, and a sample is marked as 2#. Another second magnesium alloy blank is subjected to solid solution treatment at 520°C for 8h, and then water cooled, and subjected to aging treatment at 225°C for 24h to obtain a second pretreated blank. The second pretreated blank is preheated to 420°C and then extrusion formed, the mold temperature is 360°C, the extrusion speed is 1 mm / s, and the extrusion ratio is 16. Subsequently, aging treatment is performed at 215°C for 24h to obtain a magnesium alloy profile, and a sample is marked as 3#, that is, the samples 2# and 3# are not subjected to friction stir additive manufacturing process.

[0268] The mechanical properties of the above-mentioned three samples are tested, including tensile strength, yield strength and elongation, etc., and the results are shown in Table 20.

[0269] Table 20

[0270]

[0271] As can be seen from Table 20, the tensile strength and yield strength of the 1# sample are slightly lower than those of the 2# sample, but higher than those of the 3# sample, and the 1# sample has a higher elongation of 13.2%, i.e., higher plasticity, and has better comprehensive mechanical properties.

[0272] Example 21

[0273] A preparation method of a layered heterogeneous magnesium alloy profile, comprising the following steps:

[0274] S100, cutting Mg-11Gd-3Y-0.5Nd-Zr and Mg-8Gd-3Y-0.5Nd-Zr alloy ingots into several plates with a thickness of 5 mm, taking the Mg-11Gd-3Y-0.5Nd-Zr plate as a first magnesium alloy blank, and taking the Mg-8Gd-3Y-0.5Nd-Zr plate as a second magnesium alloy blank.

[0275] S200, respectively performing solid solution treatment on each first magnesium alloy blank and each second magnesium alloy blank at 520℃ for 24h, and then water cooling to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks. The average grain size of the first pretreated blank is different from that of the second pretreated blank, and the alloy element content is also different.

[0276] S300, taking the above-mentioned plates after solid solution treatment as raw materials, alternately stacking each first pretreated blank and each second pretreated blank, combining adjacent first pretreated blanks and second pretreated blanks through a friction stir additive process, the rotation speed of the stirring head in the friction stir additive process being 1500rpm, and the feeding speed being 25mm / min, to obtain a composite blank, which can be machined and used as an extrusion blank.

[0277] S400, preheating the above-mentioned composite blank to 500℃, and then performing extrusion forming, the mold temperature being 360℃, the extrusion speed being 1mm / s, and the extrusion ratio being 5. Subsequently, aging treatment is performed at 215℃ for 24h to obtain a layered heterogeneous magnesium alloy profile, and a sample is taken and marked as 1#.

[0278] As a comparison, another first magnesium alloy blank and another second magnesium alloy blank are respectively subjected to solid solution treatment at 520℃ for 24h, and then water cooled to obtain a first pretreated blank and a second pretreated blank. The first pretreated blank and the second pretreated blank are respectively preheated to 500℃, and then subjected to extrusion forming, the mold temperature being 360℃, the extrusion speed being 1mm / s, and the extrusion ratio being 16. Subsequently, aging treatment is respectively performed at 215℃ for 24h to obtain magnesium alloy profiles, and samples are respectively taken and marked as 2# and 3#, i.e., the 2# and 3# samples do not use the friction stir additive process.

[0279] The three samples are subjected to mechanical property tests, including tensile strength, yield strength and elongation, and the results are shown in Table 21.

[0280] Table 21

[0281]

[0282] As can be seen from Table 21, the tensile strength and yield strength of the 1# sample are higher than those of the 2# and 3# samples, and the 1# sample has a higher elongation of 7.8%, i.e. higher plasticity, and has better comprehensive mechanical properties.

[0283] As can be seen from the above tables, the preparation method of the layered heterogeneous magnesium alloy profile of the present application uses the friction stir additive process, which can make the strength and plasticity of the material synergistic, so as to obtain better comprehensive performance, compared with the traditional single extrusion process.

[0284] The above describes the preferred embodiments of the present application and the test verification in detail. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present application without creative labor. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the concept of the present application shall be within the protection scope defined by the claims.

Claims

1. A method for producing a layered isomeric magnesium alloy profile, characterized in that The application relates to a preparation method of a layered heterogeneous magnesium alloy profile. a plurality of first magnesium alloy blanks and a plurality of second magnesium alloy blanks are provided; each of the first magnesium alloy blanks and each of the second magnesium alloy blanks is subjected to solid solution treatment to obtain a plurality of first pretreated blanks and a plurality of second pretreated blanks, and the average grain size of the first pretreated blanks is different from that of the second pretreated blanks; each of the first pretreated blanks and each of the second pretreated blanks is alternately stacked in sequence, and adjacent first pretreated blanks and second pretreated blanks are combined through a friction stir additive process to obtain a composite blank; the composite blank is sequentially subjected to extrusion forming and aging treatment to obtain a layered heterogeneous magnesium alloy profile.

2. The method of producing a layered heterostructured magnesium alloy profile according to claim 1, characterized in that In the friction stir additive process, the rotating speed of the stirring head is 750 rpm-5000 rpm, and the feeding speed is 10 mm / min-500 mm / min.

3. The method of producing a layered heterostructured magnesium alloy profile according to claim 1, characterized in that In the solid solution treatment, the temperature is 400 DEG C-520 DEG C, and the time length is 8 h-72 h.

4. The method of producing a layered heterostructured magnesium alloy profile according to claim 1, characterized in that In the aging treatment, the temperature is 180 DEG C-250 DEG C, and the time length is 8 h-100 h.

5. The method of producing a layered heterostructured magnesium alloy profile according to claim 1, characterized in that, In the extrusion forming, the temperature of the composite blank is 400 DEG C-500 DEG C, the temperature of the die is 300 DEG C-400 DEG C, the extrusion speed is 0.2 mm / s-20 mm / s, and the extrusion ratio is 5-60:

1.

6. The method of producing a layered heterostructured magnesium alloy profile according to claim 1, characterized in that After the solid solution treatment of each of the first magnesium alloy blanks and each of the second magnesium alloy blanks, each of the first magnesium alloy blanks or each of the second magnesium alloy blanks is subjected to pre-aging treatment, the temperature is 225 DEG C-400 DEG C, and the time length is 8 h-24 h.

7. A wrought magnesium alloy profile of the type described in the preamble, characterized in that The layered heterogeneous magnesium alloy profile is prepared by the preparation method of the layered heterogeneous magnesium alloy profile according to any one of claims 1 to 6.

8. Application of a layered heterogeneous magnesium alloy profile prepared by the preparation method of the layered heterogeneous magnesium alloy profile according to any one of claims 1 to 6 in the fields of aerospace, transportation and special equipment.

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