A granular inhomogeneous isomeric magnesium alloy composite plate and a preparation method thereof

Abstract

This invention relates to the field of composite material preparation, specifically to a heterogeneous magnesium alloy composite plate with non-uniform particles and its preparation method. The method includes: providing a first plate and a second plate, wherein the first plate is a magnesium alloy plate without reinforcement, and the second plate is a magnesium alloy plate including reinforcement; alternately stacking the first plate and the second plate to form a multi-layered laminate; and extruding the laminate to obtain the heterogeneous magnesium alloy composite plate with non-uniform particles. This invention can solve the problem of strength-plasticity imbalance in magnesium-based composite materials, possessing good plasticity while maintaining reasonable strength.

Description

Technical Field

[0001] This invention relates to the field of composite material preparation, specifically to a particle-heterogeneous magnesium alloy composite plate and its preparation method. Background Technology

[0002] Magnesium-based composites can achieve higher strength, hardness, and wear resistance while maintaining lightweight properties, making them promising for applications in aerospace, military, transportation, and electronics. Adding particulate reinforcement can refine grains, strengthen the second phase, enhance load transfer, and create a mismatch between the coefficient of thermal expansion and the elastic modulus, thus significantly improving strength and hardness. However, due to undesirable interfacial reactions or property mismatches, the increase in strength of magnesium-based composites often comes at the cost of reduced plasticity. Conversely, low elongation limits the applications of magnesium-based composites. Therefore, developing methods for creating magnesium-based composites that combine strength and plasticity is urgently needed.

[0003] In recent years, various heterogeneous metallic materials, such as gradient structures, layered structures, and two-phase and multiphase microstructures, have been shown to simultaneously achieve high strength and good ductility. This is mainly because significant mechanical property mismatches exist between these heterogeneous microstructure regions, such as yield strength, rheological stress, and strain hardening capacity, leading to stress / strain distribution and back stress hardening, resulting in high strengthening and hardening effects in heterogeneous materials. Among these heterogeneous structures, layered metallic structures have significant advantages in structural applications because their excellent tensile properties can be achieved by adjusting microstructure parameters, such as interfacial microstructure, interfacial spacing, and hardness differences between plates. Currently, the microstructure control of heterogeneous structures in magnesium-based composites is not mature, and the synthesis methods for heterogeneous composites are usually achieved through multi-stage ball milling. However, this process has extremely strict requirements on particle dispersion, ball milling parameters, and equipment, making it difficult to promote. Summary of the Invention

[0004] The purpose of this invention is to provide a particle-heterogeneous magnesium alloy composite plate and its preparation method, which can solve the problem of imbalance between strength and plasticity in magnesium-based composite materials.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a method for preparing a particle-heterogeneous heterogeneous magnesium alloy composite plate, comprising: A first plate and a second plate are provided, wherein the first plate is a magnesium alloy sheet excluding reinforcement, and the second plate is a magnesium alloy sheet including reinforcement; The first and second plates are alternately stacked to form a multi-layered composite plate. The composite plate is then extruded to obtain a heterogeneous magnesium alloy composite plate with non-uniform particles.

[0006] Furthermore, the thickness ratio of the first plate to the second plate is 1:1 to 1.5; And / or, the stacking ratio of the first plate and the second plate is 1:1 to 2.

[0007] Furthermore, by weight percentage, the second plate comprises 85% to 98.5% magnesium alloy matrix and 1.5% to 15% reinforcement; And / or, the reinforcing material includes pure titanium, TC4, Al2O3, SiC, etc.

[0008] Furthermore, the process parameters for the extrusion compounding include: the extrusion temperature is set to 250℃~350℃, and the extrusion ratio is set to 5~10:1.

[0009] Furthermore, both the first plate and the second plate are manufactured by powder sintering and extrusion, comprising: The ingredients are prepared by preparing the blank powder for the first plate or the second plate, wherein the blank powder for the first plate includes magnesium alloy matrix powder, and the blank powder for the second plate includes magnesium alloy matrix powder and reinforcing powder. Ball milling is used to process the blank powder of the first or second plate. Sintering involves hot pressing and sintering the ball-milled billet powder to obtain sintered blocks. Extrusion: The sintered block is extruded to obtain the first plate or the second plate.

[0010] Furthermore, the ball mill speed is set to 50 rpm to 120 rpm, and the ball milling time is set to 120 min to 360 min; And / or, the sintering temperature is set to a×T m , a It is 0.6~0.8. T m The melting point of the magnesium alloy matrix powder is used as the reference, and the sintering time is set to 30 min to 60 min. And / or, the extrusion temperature is set to 250℃~350℃, and the extrusion ratio is set to 5~10:1.

[0011] Secondly, the present invention provides a particle-heterogeneous heterogeneous magnesium alloy composite plate, which is prepared by the above-mentioned preparation method of particle-heterogeneous heterogeneous magnesium alloy composite plate.

[0012] The beneficial effects of this invention are: 1. The particle-heterogeneous heterogeneous magnesium alloy composite plate prepared by the present invention is composed of alternating layers of reinforced and unreinforced layers. During tensile deformation, the reinforced layer, i.e., the hard phase, provides high strength, while the unreinforced layer, i.e., the soft phase, can maintain good plasticity. The strain coordination and deformation gradient between the soft and hard phases will induce HDI (Hetero-Deformation Induced) strengthening, thereby maintaining good tensile plasticity while maintaining high strength in the heterogeneous magnesium matrix composite plate.

[0013] 2. In this invention, both the first and second plates are produced by powder sintering and extrusion, ensuring the uniformity of their composition. By controlling the distribution of the reinforcing powder in the second plate, the ratio of soft to hard phases can be altered, achieving flexible control over the microstructure and mechanical properties of the heterogeneous magnesium alloy composite plate. This avoids the problem of difficulty in precisely controlling the ratio and distribution of soft and hard phases in multi-stage ball milling. This process also has the potential for large-scale industrial production. Attached Figure Description

[0014] Figure 1 A flowchart illustrating the preparation method of the particle-heterogeneous heterogeneous magnesium alloy composite plate of the present invention is shown.

[0015] Figure 2 A flowchart illustrating the preparation method of the particle-heterogeneous magnesium alloy composite plate according to Embodiment 1 of the present invention is shown.

[0016] Figure 3 The microstructure of the magnesium alloy plates prepared according to Embodiment 1, Comparative Example 1, and Comparative Example 2 of the present invention is shown.

[0017] Figure 4 A schematic diagram showing the mechanical properties of magnesium alloy plates prepared according to Embodiment 1, Comparative Example 1, and Comparative Example 2 of the present invention is illustrated. Detailed Implementation

[0018] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0019] In one embodiment, see Figure 1 As shown, the present invention provides a method for preparing a particle-heterogeneous heterogeneous magnesium alloy composite plate, which includes: A first plate and a second plate are provided, wherein the first plate is a magnesium alloy sheet excluding reinforcement, and the second plate is a magnesium alloy sheet including reinforcement; The first and second plates are alternately stacked to form a multi-layered composite plate. The composite plate is then extruded to obtain a heterogeneous magnesium alloy composite plate with non-uniform particles.

[0020] The heterogeneous magnesium alloy composite plate prepared by this invention consists of alternating layers of unreinforced and reinforced layers. During tensile deformation, the reinforced layer, i.e., the hard phase, provides high strength, while the unreinforced layer, i.e., the soft phase, maintains good plasticity. The strain coordination and deformation gradient between the soft and hard phases induce Hetero-Deformation Induced (HDI) strengthening, thereby maintaining good tensile plasticity while ensuring high strength in the heterogeneous magnesium-based composite plate.

[0021] In a preferred embodiment, the thickness ratio of the first plate to the second plate is 1:1 to 1.5; this ratio range is chosen based on considerations of material mechanical properties. A thicker first plate (excluding the magnesium alloy sheet with reinforcement) can provide better toughness and ductility, while a thicker second plate (including the magnesium alloy sheet with reinforcement) can enhance the overall strength and hardness. By adjusting this ratio, the overall strength of the magnesium alloy composite plate can be improved while maintaining a certain level of toughness.

[0022] The stacking ratio of the first and second plates is 1:1 to 3. This ratio range is chosen to achieve a reasonable distribution of unreinforced and reinforced layers in the composite plate. When the stacking ratio is close to 1:1, the reinforcement and pure magnesium alloy are more evenly distributed in the plate, which is suitable for applications requiring balanced performance.

[0023] In actual manufacturing, the selection of the thickness ratio and the number of stacked layers should be comprehensively considered based on specific application requirements and material properties. For example, if the composite plate needs to withstand large impact loads, the thickness and number of stacked layers of the second plate (reinforcing magnesium alloy plate) can be appropriately increased to improve its impact resistance. Conversely, if the composite plate requires good processability and formability, the thickness and number of stacked layers of the first plate (pure magnesium alloy plate) can be appropriately increased.

[0024] In addition, it is necessary to maintain the flatness and tightness between layers during the stacking process to ensure a good metallurgical bond is formed during extrusion lamination. Meanwhile, optimizing the extrusion process parameters is also a key factor in ensuring the performance of the final composite sheet.

[0025] In summary, by optimizing the thickness ratio of the first plate and the second plate, as well as the stacking layer ratio, a particle-heterogeneous magnesium alloy composite plate with more balanced performance and a more reasonable structure can be prepared.

[0026] In a preferred embodiment, the second plate comprises 85% to 98.5% magnesium alloy matrix and 1.5% to 15% reinforcement by weight percentage; the reinforcement includes pure titanium, TC4, Al2O3, SiC, etc.

[0027] The magnesium alloy matrix content in the second plate is 85% to 98.5% by weight. This range ensures that the magnesium alloy matrix, as the main material, provides good basic properties for the composite plate, such as toughness, corrosion resistance and machinability.

[0028] The content of the reinforcing agent is controlled between 1.5% and 15%. Within this range, the reinforcing agent effectively improves the key properties of the second sheet (and thus the entire composite board), such as strength, hardness, and abrasion resistance. The amount of reinforcing agent added needs to be precisely adjusted according to specific application requirements to achieve the optimal performance balance.

[0029] This invention uses pure titanium as a reinforcement. Pure titanium possesses characteristics such as high strength, low density, excellent corrosion resistance, and good biocompatibility, making it an ideal reinforcement material. When pure titanium is added to a magnesium alloy matrix as a reinforcement, the mechanical properties of the composite material can be significantly improved through interactions with the matrix (such as grain refinement, load transfer, and dislocation strengthening).

[0030] In addition, other types of reinforcing materials, such as ceramic particles and intermetallic compounds, can be explored according to actual needs to further enrich and optimize the performance characteristics of composite panels.

[0031] In summary, by precisely controlling the ratio of magnesium alloy matrix and reinforcement in the second plate and selecting appropriate reinforcement materials (such as pure titanium), particle-heterogeneous magnesium alloy composite plates with excellent mechanical properties and comprehensive performance can be prepared.

[0032] In a preferred embodiment, the extrusion composite process parameters include: an extrusion temperature of 250°C to 350°C and an extrusion ratio of 5 to 10:1, to ensure that ideal microstructure and mechanical properties can be obtained when preparing heterogeneous magnesium alloy composite plates with non-uniform particles.

[0033] The extrusion temperature was set between 250°C and 350°C. This temperature range was chosen based on considerations of the hot working properties of magnesium alloys. Within this temperature range, the magnesium alloy matrix possesses sufficient plasticity and fluidity to facilitate extrusion deformation while avoiding excessively high temperatures that could lead to overheating or coarsening of the material.

[0034] During the extrusion process, it is necessary to strictly control the heating temperature and holding time to ensure that the entire laminate reaches a uniform temperature distribution before extrusion. This helps to reduce the temperature gradient during extrusion and reduce defects such as deformation and cracks caused by uneven temperature.

[0035] The extrusion ratio is set to 5~10:1. The extrusion ratio is the rate of change of the material's cross-sectional area during extrusion, reflecting the severity of the extrusion deformation. Selecting the extrusion ratio within this range ensures sufficient deformation and bonding of the material while avoiding excessive deformation that could lead to excessive defects and stress concentration within the material.

[0036] The specific choice of extrusion ratio should be based on a comprehensive consideration of factors such as the type of material, thickness, number of stacked layers, and required performance. A larger extrusion ratio can result in finer grains and a tighter bonding interface, but it may also increase the processing difficulty and cost of the material.

[0037] In actual production, in addition to extrusion temperature and extrusion ratio, other process parameters such as extrusion speed, die design, and lubrication conditions need to be considered to affect the extrusion compounding process. By optimizing these parameters, the molding quality and performance stability of composite sheets can be further improved.

[0038] Furthermore, the extruded composite sheets may require subsequent heat treatment or surface treatment processes to further improve their mechanical properties and surface quality. The selection and implementation of these processes also need to be comprehensively considered based on specific application requirements and material properties.

[0039] In summary, by precisely controlling process parameters such as extrusion temperature and extrusion ratio, it is possible to prepare particle-heterogeneous heterogeneous magnesium alloy composite plates with excellent mechanical properties and microstructure.

[0040] In a preferred embodiment, both the first plate and the second plate are formed by powder sintering and extrusion, comprising: The process involves preparing the blank powder for either the first or second plate. The blank powder for the first plate comprises magnesium alloy matrix powder, while the blank powder for the second plate comprises both magnesium alloy matrix powder and reinforcing powder. When preparing the blank powder for the first plate, the main component is magnesium alloy matrix powder. This powder should possess good flowability and sinterability to ensure smooth operation of subsequent processes. When preparing the blank powder for the second plate, in addition to the magnesium alloy matrix powder, reinforcing powder must be added. The selection of the reinforcing powder should be based on its enhancing effect on the matrix properties and its compatibility with the matrix. By precisely controlling the amount of reinforcing powder added, customized design of the composite plate's properties can be achieved.

[0041] Ball milling is the process of grinding the raw material powder for the first or second plate. The main purpose of ball milling is to refine the powder particles, improve the uniformity and activity of the powder, and promote densification and bonding strength during sintering. During ball milling, parameters such as milling time, milling media, and milling speed must be controlled to ensure that the powder achieves the desired refining effect.

[0042] Sintering involves hot-pressing and sintering the ball-milled raw powder to obtain sintered blocks. During sintering, the powder particles undergo plastic deformation and solid-phase diffusion under high temperature and pressure, forming a dense sintered block. The selection of parameters such as sintering temperature, pressure, and time should be optimized based on the composition and properties of the powder to ensure that the quality and performance of the sintered block meet the requirements.

[0043] Extrusion involves pressing sintered blocks to obtain a first or second sheet. During extrusion, the sintered blocks undergo plastic deformation under high temperature and pressure to form a sheet with the desired shape and size. Extrusion process parameters such as extrusion temperature, extrusion ratio, and extrusion speed need to be optimized based on material properties and sheet requirements to ensure the forming quality and mechanical properties of the sheet.

[0044] Plates prepared by powder sintering and extrusion processes have advantages such as fine microstructure, uniform properties, and controllable composition. By adjusting the powder composition and process parameters, first and second plates with different performance characteristics can be prepared to meet the application needs of different fields.

[0045] In actual production, it is also necessary to pay attention to the impact of factors such as the purity of raw material powder, the selection of ball milling media, the control of sintering atmosphere, and the design of extrusion dies on the performance of the sheet material. By optimizing these aspects, the quality and performance stability of the sheet material can be further improved.

[0046] In a preferred embodiment, the ball mill rotation speed is set to 50 rpm to 120 rpm. The selection of the rotation speed should be determined based on the particle size, hardness of the powder, and the characteristics of the milling media. Lower rotation speeds help reduce powder particle breakage and wear, while higher rotation speeds can improve ball milling efficiency but may also lead to powder overheating and agglomeration. Therefore, in actual operation, it is necessary to find a suitable rotation speed range to achieve the best ball milling effect.

[0047] The ball milling process time is set between 120 and 360 minutes, and the processing time directly affects the fineness and uniformity of the powder. Longer processing times help obtain finer powder particles and a more uniform particle size distribution, but also increase production costs and energy consumption. Therefore, when determining the processing time, both the powder fineness requirements and production efficiency need to be considered.

[0048] Sintering temperature set to a×T m ,a It is 0.6~0.8. T m The melting point of the magnesium alloy matrix powder is set in this way to ensure that the sintering process is carried out within a suitable temperature range. This avoids overheating and performance degradation caused by excessively high temperatures, while also ensuring that the sintered block has sufficient density and strength.

[0049] The sintering time is set between 30 and 60 minutes, and the length of the sintering time has a significant impact on the density and properties of the sintered block. A shorter sintering time may not allow the powder particles to fully bond and form a dense sintered block, while a longer sintering time may lead to grain growth and performance degradation. Therefore, when determining the sintering time, it is necessary to comprehensively consider the sintering characteristics and performance requirements of the material.

[0050] The extrusion temperature is set to 250℃~350℃. This temperature range is chosen based on the hot working properties of magnesium alloys, which can ensure that the material has sufficient plasticity and fluidity during the extrusion process.

[0051] The extrusion ratio is set between 5 and 10:1, and its magnitude determines the degree of material deformation during extrusion. A larger extrusion ratio can result in finer grains and a tighter bonding interface, but it may also increase the processing difficulty and cost of the material. Therefore, when determining the extrusion ratio, it is necessary to comprehensively consider the material's performance requirements and processing conditions.

[0052] In summary, by precisely controlling the key parameters in the ball milling, sintering, and extrusion processes, it is possible to prepare particle-heterogeneous heterogeneous magnesium alloy composite plates with excellent properties. Optimizing these parameters is of great significance for improving the forming quality, mechanical properties, and stability of the plates.

[0053] In another embodiment, the present invention provides a particle-heterogeneous heterogeneous magnesium alloy composite plate, which is prepared by the above-described preparation method of particle-heterogeneous heterogeneous magnesium alloy composite plate.

[0054] The following will illustrate this with specific examples.

[0055] Example 1, see Figure 2 As shown, a method for preparing a particle-heterogeneous heterogeneous magnesium alloy composite plate includes the following steps: Step 1: Prepare the first plate and the second plate.

[0056] For the formulation, 257.6g of pure AZ31 magnesium alloy powder was used as the unreinforcing powder, i.e., the blank powder for the first plate. The AZ31 magnesium alloy powder and TA2 nano-pure titanium powder were mixed in a ratio of 250g:7.6g to obtain the reinforcing powder, i.e., the blank powder for the second plate.

[0057] Ball milling was performed using stainless steel grinding balls at a ball-to-powder ratio of 5:1. 750g of stainless steel grinding balls were pre-placed in two separate grinding jars. The raw material powder for the first plate was then loaded into a dedicated grinding jar. The powder inside the jar was purged using vacuum equipment and high-purity argon gas, and finally filled with argon as a protective gas. The grinding jars were then symmetrically placed on a planetary ball mill, with a rotation speed of 80 rpm and a grinding time of 360 minutes. The grinding process consisted of a 10-minute forward rotation, a 10-minute stop, and a 10-minute reverse rotation cycle. After grinding, the mixture was allowed to stand for 180 minutes. Similarly, the raw material powder for the second plate was ball-milled.

[0058] Sintering: The ball-milled blank powders of the first and second plates were hot-pressed and sintered using isostatic graphite molds. The blank powders were then encapsulated in the hot-pressing cavity and placed in a sintering furnace. The powders were then compressed with a pre-pressure of 0.5 MPa. After the furnace was evacuated to a certain vacuum level, the temperature was raised to 500°C at a rate of 10°C / min and held at that temperature. The pressure was increased to 20 MPa after 10 minutes and held at that temperature for 30 minutes. The loading and heating were then stopped. After the furnace temperature dropped to room temperature, samples were taken to obtain a reinforced composite material block. The same sintering process was then repeated to obtain a non-reinforced alloy material block.

[0059] Extrusion: The sintered block is processed into small pieces with dimensions of 35mm × 15mm × 15mm, and the surface is polished and degreased. Before extrusion, graphite ink is sprayed onto the inner wall of the extrusion cylinder as a lubricant. After the temperature of the extrusion die and extrusion cylinder stabilizes at 300℃, it is held at that temperature for 10 minutes. Then, extrusion pressure is applied through the extrusion rod for one pass extrusion at an extrusion speed of 6mm / s and a reduction of 90%, finally obtaining a first plate with a thickness of approximately 1.5mm. A second plate is obtained under the same extrusion operation.

[0060] Step 2, stacking: The first and second plates obtained in Step 1 are machined to obtain first and second plates with dimensions of approximately 35mm×15mm×1.4mm. After surface grinding and degreasing treatment of the plates, 6 composite material plates and 5 alloy plates are alternately stacked to form a sandwich structure composite plate, with the middle layer being the first plate and the top and bottom layers being the second plate.

[0061] Step 3: Extrusion lamination. The laminated board is placed in the extrusion cylinder with the extrusion direction parallel to the width direction of the die exit. After the temperature of the extrusion die and cylinder stabilizes at 300℃, it is held at this temperature for 10 minutes. The extrusion speed is then set to 6 mm / s, ultimately yielding a layered heterogeneous magnesium-based composite board with a thickness of approximately 1.5 mm, consisting of reinforced / unreinforced / reinforced materials. Mechanical testing is performed (see [link to mechanical testing]). Figure 4As shown, the yield strength of the prepared layered heterogeneous magnesium-based composite plate is 177.9 MPa, the tensile strength is 309.8 MPa, and the elongation is 13.5%.

[0062] Using the sintered and extruded reinforced composite material plate as a comparative example, the specific steps include the following: 1. Ingredients: Mix AZ31 magnesium alloy powder and TA2 nano pure titanium powder in a ratio of 250g:7.6g to obtain reinforced powder.

[0063] 2. Ball milling: Stainless steel balls are used as grinding beads at a ball-to-material ratio of 5:1. 750g of stainless steel grinding beads are placed in two separate grinding jars. The enriched powder is then loaded into the dedicated grinding jars. The powder inside the jars is purged using vacuum equipment and high-purity argon gas. Finally, the jars are filled with argon gas as a protective gas. The grinding jars are placed symmetrically on a planetary ball mill. The rotation speed is set to 80 rpm and the time is 360 min. The grinding process consists of a 10-minute forward rotation, a 10-minute stop, and a 10-minute reverse rotation cycle. After grinding, the jars are allowed to stand for 180 min.

[0064] 3. Sintering: The ball-milled reinforced powder was hot-pressed and sintered using isostatic graphite molds. The powder blank was sealed in the hot-pressing cavity and placed in the sintering furnace. The powder was then compressed with a pre-pressure of 0.5 MPa. After the furnace was evacuated to a certain vacuum level, the temperature was raised to 500℃ at a rate of 10℃ / min and held. The pressure was increased to 20 MPa after 10 minutes and held for 30 minutes. The loading and heating were then stopped. After the furnace temperature dropped to room temperature, samples were taken to obtain the reinforced composite material block.

[0065] 4. Extrusion: The sintered block is processed into small blocks with dimensions of 35mm×15mm×15mm, and the surface is polished and degreased. Before extrusion, graphite ink is sprayed on the inner wall of the extrusion cylinder as a lubricant. After the temperature of the extrusion die and the extrusion cylinder stabilizes at 300℃, it is kept at that temperature for 10 minutes. Then, extrusion pressure is applied through the extrusion rod to perform one extrusion pass. The extrusion speed is 6mm / s and the reduction is 90%, finally obtaining a plate with a thickness of about 1.5mm.

[0066] Based on mechanical testing, see [link / reference] Figure 4 As shown, the mechanical properties of the plate obtained in Comparative Example 1 include: yield strength of 207.3 MPa, tensile strength of 321.2 MPa, and elongation of 7.8%.

[0067] Using the unreinforced alloy material plate obtained by sintering and extrusion as Comparative Example 2, an unreinforced alloy material plate was prepared using a similar method to Comparative Example 1. Mechanical testing was performed; see [link to relevant documentation]. Figure 4As shown, the mechanical properties of the comparative plate obtained by extrusion include: yield strength of 168.7 MPa, tensile strength of 288.8 MPa, and elongation of 12.6%.

[0068] The comparison shows that Comparative Example 1 has high strength but extremely low plasticity; while Comparative Example 2 has high plasticity but unsatisfactory strength; compared to Comparative Examples 1 and 2, Example 1 has yield strength and tensile strength at the average level of both, but Example 1 has the best plasticity. Therefore, Example 1 exhibits a good synergy of strength and plasticity. Because the heterogeneous structure induces heterogeneous deformation-induced hardening during deformation, and the absence of a reinforcing bulk phase provides fracture delay, the heterogeneous composite material maintains reasonable strength while possessing good plasticity.

[0069] The microstructure of the products obtained in Example 1, Comparative Example 1, and Comparative Example 2 was observed, and the results are shown in [reference]. Figure 3 As shown, Comparative Examples 1 and 2 are homogeneous structures. Comparative Example 1 is a composite material structure with uniformly distributed reinforcement, and Comparative Example 2 is a homogeneous alloy structure without reinforcement. In contrast, Example 1 is a non-homogeneous structure with dispersed and layered reinforcement. Furthermore, the grain sizes in Comparative Examples 1 and 2 are also uniformly distributed, while the grains in Example 1 exhibit a layered distribution.

[0070] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A method for preparing a particle-heterogeneous heterogeneous magnesium alloy composite plate, characterized in that, include: A first plate and a second plate are provided, wherein the first plate is a magnesium alloy sheet excluding reinforcement, and the second plate is a magnesium alloy sheet including reinforcement; by weight percentage, the second plate comprises 85% to 98.5% magnesium alloy matrix and 1.5% to 15% reinforcement, wherein the reinforcement comprises pure titanium, TC4, Al2O3, and SiC; Both the first plate and the second plate are produced by powder sintering and extrusion, comprising: The ingredients are prepared by preparing the blank powder for the first plate or the second plate, wherein the blank powder for the first plate includes magnesium alloy matrix powder, and the blank powder for the second plate includes magnesium alloy matrix powder and reinforcing powder. Ball milling is used to process the blank powder of the first plate or the second plate; the ball milling speed is set to 50 rpm to 120 rpm and the ball milling time is set to 120 min to 360 min. Sintering involves hot pressing and sintering the ball-milled billet powder to obtain sintered blocks; the sintering temperature is set to... a × T m , a It is 0.6~0.

8. T m The melting point of the magnesium alloy matrix powder is used as the reference, and the sintering time is set to 30 min to 60 min. Extrusion: The sintered block is extruded at a temperature of 250℃ to 350℃ and an extrusion ratio of 5 to 10:1 to obtain a first plate or a second plate. The first plate and the second plate are alternately stacked to form a multi-layered composite plate. The composite plate is then extruded to obtain a heterogeneous magnesium alloy composite plate with non-uniform particles. The extrusion process parameters include: the extrusion temperature is set to 250℃~350℃ and the extrusion ratio is set to 5~10:

1.

2. The method for preparing the particle-heterogeneous heterogeneous magnesium alloy composite plate according to claim 1, characterized in that: The thickness ratio of the first plate to the second plate is 1:1 to 1.5; And / or, the stacking ratio of the first plate and the second plate is 1:1 to 2.

3. A composite sheet of heterogeneous magnesium alloy with non-uniform particles, characterized in that: The composite sheet was prepared using the method described in claim 1 or 2 for preparing heterogeneous magnesium alloy composite sheets with non-uniform particles.

Images