A magnesium-titanium-aluminum composite material and a preparation process thereof

Abstract

The application provides a preparation process of a magnesium-titanium-aluminum composite material, which comprises the following steps: A) mixing Ti-Al alloy powder, Al-RE alloy powder, Al-V alloy powder and B powder to obtain mixed powder; B) preheating the mixed powder and then spraying the mixed powder to the surface of a magnesium alloy to obtain a sprayed layer; C) inductively heating the sprayed layer; D) rolling the obtained initial magnesium-titanium-aluminum composite material; E) detecting the surface temperature of the sprayed layer after rolling, when the surface temperature of the sprayed layer is less than 2 / 3 of the melting point, repeatedly inductively heating and rolling, and repeating for multiple times to obtain the magnesium-titanium-aluminum composite material, and when the surface temperature of the sprayed layer is greater than or equal to 2 / 3 of the melting point, the magnesium-titanium-aluminum composite material is obtained. The application adopts the mode of "spraying + inductive heating + rolling" to prepare the magnesium-titanium-aluminum composite material which has high strength and toughness, wear resistance and corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of magnesium alloy technology, and in particular to a magnesium-titanium-aluminum composite material and its preparation process. Background Technology

[0002] High-speed rail, new energy vehicles, aerospace, and other fields all have a strong market demand for high-strength lightweight alloy sheets. To date, although magnesium alloy materials have seen some applications, these are still negligible compared to the vast majority of metal material applications. This is mainly because magnesium alloy sheets suffer from drawbacks such as high surface notch sensitivity, low toughness, and poor corrosion resistance, which severely restrict the development and application of their lightweight and high-strength advantages. Preparing magnesium sheets with other high-rigidity materials to form composite sheets can effectively improve the stiffness and other mechanical properties of magnesium alloys. Metal composite sheets / profiles are new materials obtained by using composite technology to achieve a strong metallurgical bond between two or more metals with different physical, chemical, and mechanical properties. Each layer of metal retains its original characteristics, but its overall physical, chemical, and mechanical properties are significantly improved compared to single metals.

[0003] There are already reports on patents related to the preparation of magnesium alloy composite plates. For example, Chinese patent CN102501454B, authorized by the patent, provides a high-performance magnesium alloy microwave absorbing composite plate and its preparation method. The disclosed high-performance magnesium alloy microwave absorbing composite plate comprises three layers: the top layer is a Mg35Zn53Gd12 quasi-crystalline microwave absorbing layer, below which is a bonding layer composed of Mg-Zn and Mg eutectic structures, and the bottom layer is a Mg-15Gd-4Er-0.4Zr magnesium alloy plate. The preparation method includes the following steps: Mg-15... The Gd-4Er-0.4Zr alloy ingot is statically pressed at 50MPa at room temperature, heated to 510℃ and held for 3 hours; cooled to 370℃ and extruded into a 10mm thick sheet at an extrusion ratio of 1:20, held at 310℃ for 30 minutes, and rolled to a 5mm thickness; placed in a melting and casting equipment for heating; the 35Mg-50Zn-15Gd reference crystal intermediate alloy is heated and melted and directly cast onto the magnesium alloy sheet; left to stand, the baffle is removed, and it is immersed in 80℃ water; this type of microwave absorbing sheet is lightweight, high-strength, the microwave absorbing layer is not easy to peel off, and the microwave absorbing effect is good.

[0004] Chinese Patent CN109161758B discloses a high-strength, high-ductility magnesium alloy composite sheet and its preparation method. The magnesium alloy sheet is composed of Mg, Al, Zn, Mn, Si, Cu, and Fe, and is obtained through steps such as friction stirring and surface shot peening, ultimately achieving a product with excellent mechanical properties. This invention uses industrial-grade rolled magnesium alloy sheets as raw material, has a relatively simple production process, and significantly improves the overall performance of the sheet.

[0005] Chinese Patent CN110293145B, authorized by CN110293145B, discloses a magnesium-aluminum composite sheet and its preparation method. The magnesium alloy composite sheet comprises a magnesium alloy core layer, an aluminum alloy cladding layer, and a bonding interface layer formed between the magnesium alloy core layer and the aluminum alloy cladding layer. The preparation method includes: casting molten aluminum alloy onto a magnesium alloy rod to obtain a magnesium-aluminum composite ingot; extruding the magnesium-aluminum composite ingot to obtain a magnesium-aluminum composite billet; and finally rolling the magnesium-aluminum composite billet to obtain a magnesium-aluminum composite sheet. This invention achieves initial composite formation between aluminum and magnesium alloys through casting, followed by metallurgical bonding through extrusion, and further enhances the bonding strength through rolling. Through the synergistic effect of these three processes, a magnesium-aluminum composite sheet with higher bonding strength and superior mechanical properties can be obtained.

[0006] Chinese Patent No. 201410409421.X discloses a method for rolling Al / Cu / Mg composite plates, comprising the following steps: 1) homogenizing aluminum alloy or pure aluminum billets and magnesium alloy billets; 2) slotting corresponding positions on the aluminum alloy or pure aluminum billets, magnesium alloy billets, and transverse copper mesh; 3) removing the oxide layer from the surface of the aluminum alloy or pure aluminum billets and magnesium alloy billets, roughening the surface, then cleaning with an ultrasonic cleaner and anhydrous ethanol and drying to prevent impurities at the interface of the composite material; 4) stacking the billets in the order of aluminum alloy or pure aluminum billets, transverse copper mesh, magnesium alloy billets, transverse copper mesh, and aluminum alloy or pure aluminum billets, and inserting longitudinal copper mesh into the slots of the stacked billets to form a composite billet; 5) cold rolling; 6) hot rolling; 7) stacking rolling. This invention can improve the interfacial bonding strength of magnesium-aluminum composite plates and increase the impact toughness of the material, thereby improving the comprehensive mechanical properties of the composite material.

[0007] Chinese Patent Publication No. CN113858725A discloses a multi-layer composite sheet and its preparation method. The disclosed preparation method includes the following steps: S1) Material preparation: Aluminum alloy and magnesium alloy materials are processed to the required shape and size. The outer two layers of aluminum alloy have S-shaped arc surfaces, and the middle layer is a magnesium alloy layer. The three can be combined into a cylinder; S2) Surface cleaning: The aluminum alloy and magnesium alloy materials prepared in step S1 are polished and then cleaned to make the alloy material surface clean; S3) Assembly: The cleaned alloy materials in step S2 are assembled and combined, and fixed into a cylinder by mechanical interlocking; S4) Extrusion forming: The assembled magnesium-aluminum composite billet is preheated and then extruded to obtain a magnesium-aluminum composite sheet. The composite sheet prepared by the method of this invention has high alloy interface bonding strength and excellent comprehensive mechanical properties.

[0008] Chinese Patent Publication No. CN115742485A discloses a boron carbide-reinforced Mg-Al-Ta layered composite plate and its preparation method, which includes the following steps: S1) Raw material preparation, including a pure tantalum plate, an AZ-based magnesium alloy plate with a bimodal separation non-basal surface texture, and an aluminum plate with B4C ceramic particles covering the surface; S2) Stacking and fixing the raw materials to obtain a rolled billet; S3) Performing low-temperature cumulative rolling on the rolled billet to obtain a deformed plate; S4) First immersing the deformed plate in liquid nitrogen for cryogenic treatment, and then performing high-temperature diffusion annealing treatment to obtain a heat-treated plate; S5) Cutting the heat-treated plate in half, re-stacking and fixing, and repeating S3 and S4 until the set rolling passes are obtained to obtain a boron carbide-reinforced Mg-Al-Ta layered composite plate. While ensuring good interlayer interface bonding quality through mechanical and metallurgical bonding, the introduction of the ceramic reinforcing phase B4C into the composite plate further improves the interfacial mechanical properties and electromagnetic shielding performance of the composite plate.

[0009] As a lightweight structural material, magnesium alloy sheets have relatively low stiffness and strength, especially stiffness, which, being an intrinsic characteristic of the material, is difficult to improve by adding metallic elements. Titanium alloys, on the other hand, possess high strength and stiffness, effectively enhancing the overall mechanical properties of magnesium alloys. However, the hot rolling temperature of magnesium alloys is typically between 250 and 450°C, while the hot deformation temperature of titanium alloys exceeds 900°C. Therefore, the two cannot be used to prepare composite sheets. The aforementioned patents do not provide methods for preparing magnesium alloy and titanium alloy composite sheets, and existing research and reports indicate that titanium can only be applied to the surface of magnesium alloy parts or sheets in powder form through spraying or cladding. However, titanium alloy layers applied in this way are usually thin and have limited strength. Summary of the Invention

[0010] The technical problem solved by this invention is to provide a method for preparing magnesium-titanium-aluminum composite materials. The preparation method provided by this application can enable magnesium alloy and titanium-aluminum coating to have good metallurgical bonding, increase the surface strength of magnesium-titanium-aluminum composite materials, and have high wear resistance and corrosion resistance.

[0011] In view of this, this application provides a preparation process for magnesium-titanium-aluminum composite materials, including the following steps:

[0012] A) Mix Ti-Al alloy powder, Al-RE alloy powder, Al-V alloy powder and B powder to obtain a mixed powder;

[0013] B) The mixed powder is preheated and then sprayed onto the surface of the magnesium alloy to obtain a sprayed coating;

[0014] C) The sprayed coating is induction heated to a temperature greater than 3 / 4 of the melting point of the sprayed coating;

[0015] D) Roll the initial magnesium-titanium-aluminum composite material obtained in step C);

[0016] E) Detect the surface temperature of the coating after rolling. When the surface temperature of the coating is lower than 2 / 3 of the melting point, repeat steps C) and D) in sequence, repeating 3 to 10 times to obtain magnesium-titanium-aluminum composite material. When the surface temperature of the coating is higher than or equal to 2 / 3 of the melting point, magnesium-titanium-aluminum composite material is obtained.

[0017] Preferably, the content of the Ti-Al alloy powder is 1-95 wt%, the content of the Al-RE alloy powder is 1-95 wt%, the content of the Al-V alloy powder is 1-30 wt%, and the content of the B powder is 0.1-3 wt%.

[0018] Preferably, the Ti-Al alloy powder contains 0 to 99 wt% Al, the Al-RE alloy powder contains 0.1 to 90 wt% RE, and RE is selected from one or more of La, Ce, Nd, Sm, Gd, Y, Dy, Ho, Er, Yb and Eu, and the Al-V alloy powder contains 0.1 to 60 wt% V.

[0019] Preferably, the spraying method is selected from one or more of flame spraying, explosive spraying, supersonic spraying, arc spraying, plasma spraying, electro-explosive spraying, induction heating spraying, capacitor discharge spraying, laser spraying, and cold spraying; the spraying is carried out using a step-by-step spraying method, the distance between the nozzle and the magnesium alloy is 5mm to 60mm, the nozzle moving speed is 2mm / s to 40mm / s, and the nozzle powder feeding rate is 10g / min to 200g / min.

[0020] Preferably, the preheating temperature is 300-500°C, and the thickness of the sprayed coating is 50μm-3mm.

[0021] Preferably, the oscillation frequency of the induction heating coil is 500KHz to 1.2MHz, and the induced current is 10 to 300A.

[0022] Preferably, the distance between the induction heating coil and the sprayed coating is 1mm to 30mm, the relative moving speed between the induction heating coil and the magnesium alloy plate is 0.1 to 10mm / s, and the heating treatment time is 2 to 20s.

[0023] Preferably, the rolls are heated to above 200°C before rolling.

[0024] This application also provides a magnesium-titanium-aluminum composite material prepared by the aforementioned preparation process, which consists of a magnesium alloy and a coating composited on the surface of the magnesium alloy, wherein the coating is prepared from Ti-Al alloy, Al-RE alloy, Al-V alloy and B.

[0025] Preferably, the coating comprises one or more of Ti3Al, TiAl, Al2Ti, and Al3Ti.

[0026] This application provides a method for preparing a magnesium-titanium-aluminum composite material. First, Ti-Al alloy powder, Al-RE alloy powder, Al-V alloy powder, and B powder are mixed. Then, the resulting mixed powder is sprayed onto the surface of a magnesium alloy to initially prepare a titanium-aluminum-magnesium layered composite material with a magnesium alloy as the intermediate material and a titanium alloy as the outer surface. Then, the initial composite material is heated by induction heating. By limiting the heating temperature, the sprayed coating is significantly softened. The composite material is then processed by hot rolling to increase the bonding force between the sprayed coating and the magnesium alloy, thereby improving the surface toughness, wear resistance, and corrosion resistance of the composite material. Detailed Implementation

[0027] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims of the present invention.

[0028] Given the significant difference in hot deformation temperatures between magnesium alloys and titanium alloys, resulting in insufficient adhesion of the titanium alloy layer and limited strength improvement, this application provides a method for preparing a magnesium-titanium-aluminum composite material. This method employs a "spraying + induction heating + rolling" process, combined with the involved "exothermic reaction alloy system," to prepare the magnesium-titanium-aluminum composite material, thereby giving it high strength, toughness, wear resistance, and corrosion resistance. Specifically, this invention discloses a preparation process for a magnesium-titanium-aluminum composite material, including the following steps:

[0029] A) Mix Ti-Al alloy powder, Al-RE alloy powder, Al-V alloy powder and B powder to obtain a mixed powder;

[0030] B) The mixed powder is preheated and then sprayed onto the surface of the magnesium alloy to obtain a sprayed coating;

[0031] C) The sprayed coating is induction heated to a temperature greater than 3 / 4 of the melting point of the sprayed coating;

[0032] D) Roll the initial magnesium-titanium-aluminum composite material obtained in step C);

[0033] E) Detect the surface temperature of the coating after rolling. When the surface temperature of the coating is lower than 2 / 3 of the melting point, repeat steps C) and D) in sequence, repeating 3 to 10 times to obtain magnesium-titanium-aluminum composite material. When the surface temperature of the coating is higher than or equal to 2 / 3 of the melting point, magnesium-titanium-aluminum composite material is obtained.

[0034] In the preparation method of magnesium-titanium-aluminum composite materials, this application first prepares materials by mixing Ti-Al alloy powder, Al-RE alloy powder, Al-V alloy powder, and B powder to obtain a mixed powder. For the above raw materials, Ti-Al is a binary alloy containing Ti and Al, with an Al content of 0–99 wt%, specifically 3–90 wt%, and more specifically 10–70 wt%. The particle size of the Ti-Al powder is 0.1 μm–1 mm. In the Ti-Al alloy powder, Ti and Al have significantly different melting points and densities. Therefore, in metallurgy, the addition of Ti to Al alloys or Al to Ti alloys is done using an intermediate alloying method. In this application, in addition to mutual solid solution strengthening, Ti and Al also form Ti3Al, TiAl, Al2Ti, and Al3Ti compounds, which serve to harden the alloy layer. The content of the Ti-Al alloy powder is 1 to 95 wt%, specifically, the content of the Ti-Al alloy powder is 5 to 90 wt%, and more specifically, the content of the Ti-Al alloy powder is 12 to 75 wt%.

[0035] Al-RE alloy powder is a binary alloy containing Al and RE. In Al-RE, RE is selected from one or more of La, Ce, Nd, Sm, Gd, Y, Dy, Ho, Er, Yb, and Eu. The RE content ranges from 0.1% to 60%, specifically 1% to 45 wt%, and more specifically, 3% to 30 wt%. The particle size of the Al-RE alloy powder is 0.1 μm to 1 mm. Adding a small amount of rare earth elements to the Al-RE alloy powder increases the corrosion resistance and strength of the alloy layer. The content of the Al-RE alloy powder is 1% to 99 wt%, specifically 5% to 80 wt%, and more specifically, 20% to 60 wt%.

[0036] Al-V alloy powder is a binary alloy containing Al and V, wherein the V content is 0.1–60 wt%, specifically 1–50 wt%, and more specifically 5–30 wt%. The particle size of the Al-V alloy powder is 0.1 μm–1 mm. V in the Al-V alloy powder acts as a reinforcing agent for the alloy layer. The Al-V alloy powder content is 1–30 wt%, specifically 2–25 wt%, and more specifically 3–20 wt%.

[0037] Borosilicate powder can form an Al-Ti-B compound in the mixed powder and improve the alloy fluidity during induction heating. The particle size of the borosilicate powder is 0.1 μm to 1 mm. The content of the borosilicate powder is 0.1 to 3 wt%, specifically 1 to 2 wt%.

[0038] The above alloy powders are mixed in a manner known to those skilled in the art. In a specific embodiment, the mixing is carried out in a powder mixer for a time of 4 to 8 hours.

[0039] This application then preheats the mixed powder and sprays it onto the surface of the magnesium alloy to obtain a coating layer. Preferably, the magnesium alloy is polished and cleaned before spraying to facilitate the process. The mixed powder is first preheated to a temperature of 300–500°C. The spraying method can be one or more of flame spraying, explosive spraying, supersonic spraying, arc spraying, plasma spraying, electro-explosive spraying, induction heating spraying, capacitor discharge spraying, laser spraying, and cold spraying. In a specific embodiment, cold spraying is used. In the cold spraying process, a step-by-step spraying method is used. The distance between the nozzle and the magnesium alloy is 5mm–60mm, the nozzle moving speed is 2mm / s–40mm / s, and the nozzle powder feed rate is 10g / min–200g / min. Specifically, the distance between the nozzle and the magnesium alloy is 10–40mm, the nozzle moving speed is 5–30mm / s, and the nozzle powder feed rate is 20–180g / min; more specifically, the distance between the nozzle and the magnesium alloy is 20–30mm, the nozzle moving speed is 10–20mm / s, and the nozzle powder feed rate is 50–120g / min. The thickness of the sprayed layer is 50μm–3mm, specifically 1mm–2mm. The spraying described in this application achieves a uniform distribution of the sprayed layer on the magnesium alloy surface through the above-mentioned mixed powder and the control of the above-mentioned spraying process parameters. The spraying process mainly affects the thickness of the sprayed layer and has no direct impact on the bonding strength.

[0040] According to the present invention, the sprayed coating is then induction heated to a temperature greater than 3 / 4 of the melting point of the sprayed coating to soften it, which facilitates the metallurgical bonding between the sprayed coating and the magnesium alloy. The induction heating exhibits a skin effect, heating only the high-melting-point sprayed coating and not the low-melting-point magnesium alloy, thereby enabling interfacial metallurgical bonding between the sprayed coating and the magnesium alloy, increasing the bonding strength of the resulting composite material. The oscillation frequency of the induction heating coil is 0.5MHz to 1.2MHz, and the induced current is 10 to 300A. The distance between the induction heating coil and the sprayed layer is 1mm to 30mm, and the relative moving speed between the induction heating coil and the magnesium alloy plate is 0.1 to 10mm / s. The heating treatment time is 2 to 20s. Specifically, the oscillation frequency of the induction heating coil is 0.8MHz to 1.0MHz, and the induced current is 30 to 200A. The distance between the induction heating coil and the sprayed layer is 2mm to 20mm, and the relative moving speed between the induction heating coil and the magnesium alloy plate is 2 to 8mm / s. The heating treatment time is 5 to 15s. Induction heating mainly affects the temperature of the surface sprayed layer. When the induction heating temperature is too low, metallurgical bonding cannot occur at the interface; when the temperature is too high, the surface alloy layer will turn into a melt, resulting in significant flow and making rolling difficult. Therefore, for induction heating processes, the state of the surface coating is best controlled within the range of significant softening to molten state, which helps to form metallurgical bonding at the interface. However, the change in bonding strength is also affected by the rolling process.

[0041] After the aforementioned induction heating, the resulting initial magnesium-titanium-aluminum composite material is rolled. Before rolling, the rolls are preheated to a temperature above 200°C, specifically 300–400°C. This rolling process is similar to a forging-welding process, during which the sprayed coating and the magnesium alloy undergo a pressure welding effect, resulting in a metallurgical bond that is beneficial for obtaining a composite material with high bonding strength.

[0042] During the rolling process described above, the rolls carry away heat, causing a temperature drop on the surface of the composite material. The surface temperature of the coated layer after rolling is then monitored. If the surface temperature of the coated layer is below 2 / 3 of its melting point, the induction heating and rolling steps are repeated 3–10 times to obtain a magnesium-titanium-aluminum composite material. If the surface temperature of the coated layer is above or equal to 2 / 3 of its melting point, the magnesium-titanium-aluminum composite material is obtained. 2 / 3 of the melting point of the coated layer is the optimal deformation temperature. If the temperature is below this temperature, the coated layer and magnesium alloy have not achieved good metallurgical bonding, and induction heating and rolling need to be repeated 3–10 times to obtain the magnesium-titanium-aluminum composite material. If the surface temperature of the coated layer is above or equal to 2 / 3 of its melting point, the magnesium-titanium-aluminum composite material is obtained.

[0043] This application also provides a magnesium-titanium-aluminum composite material, which consists of a magnesium alloy and a coating compounded on the surface of the magnesium alloy, the coating being prepared from a Ti-Al alloy, an Al-RE alloy, an Al-V alloy, and B.

[0044] Furthermore, the coating includes one or more of Ti3Al, TiAl, Al2Ti, and Al3Ti.

[0045] This invention provides a method for preparing a magnesium-titanium-aluminum composite material. Traditional techniques for preparing composite plates often fail to achieve metallurgical bonding, especially between magnesium alloys and titanium alloys with significant differences in melting points. This application provides a magnesium-titanium-aluminum composite material, which first uses a spraying technique to uniformly spray alloy powder onto the surface of a magnesium alloy. At this point, the titanium-aluminum alloy powder and the magnesium alloy matrix are only mechanically bonded. Subsequently, induction heating is used to heat the sprayed layer, causing it to soften significantly, even reaching a molten state slightly below the melting temperature. The plate is then processed by rolling, which is somewhat similar to a "forging and welding" process. In this high-temperature and high-pressure process, the sprayed titanium-aluminum alloy layer and the magnesium alloy matrix undergo a pressure welding effect, resulting in a metallurgical bond.

[0046] To further understand the present invention, the following embodiments illustrate the magnesium-titanium-aluminum composite material and its manufacturing process provided by the present invention. The scope of protection of the present invention is not limited by the following embodiments.

[0047] Example 1

[0048] A method for preparing a magnesium-titanium-aluminum composite plate, the composition and mass percentage of each component are as follows: Ti-3wt%Al:90wt%,Al-30wt%Ce:7wt%,Al-20wt%V:2wt%,B:1wt%, the average size of the powder is about 10μm;

[0049] The preparation method is as follows:

[0050] Step 1: Mix Ti-Al powder, Al-Ce alloy powder, Al-V alloy powder, and B powder according to the mass percentage of each component, and mix them in a powder mixer for 8 hours to ensure that the powder is evenly mixed.

[0051] Step 2: Sand the 3mm thick magnesium alloy sheet and clean it with alcohol;

[0052] Step 3: Using a cold spraying process, uniformly spray the powder mixed in Step 1 onto the magnesium alloy sheet. The powder needs to be preheated in the powder hopper at a temperature of 400℃. A step-by-step spraying method is used, with the following parameters: nozzle distance from the sheet: 20mm; nozzle movement speed: 20mm / s; powder feed rate: 20g / min; after cold spraying, the thickness of the cold spray layer is approximately 1mm.

[0053] Step 4: After the above spraying is completed, the cold spray layer on the surface of the board is heated using an induction heating coil. The method is as follows: one side of the cold spray layer of the board is placed close to a plate-shaped electromagnetic induction coil, with the board and the plate-shaped induction coil parallel and at a fixed distance, and a staggered relative movement occurs. The electromagnetic induction oscillation range is 1.0MHz, the induction current range is 80A, the distance between the induction coil and the cold spray layer is 2mm, the relative moving speed between the induction coil and the board is 2mm / s, and the heating time is 10s. The temperature is measured during the induction heating process, and heating is stopped when the surface temperature of the cold spray coating reaches 1500℃.

[0054] Step 5: When the cold spray layer reaches the required temperature, heat the rolling mill rolls to 300°C to roll the sheet and measure the surface temperature of the cold spray layer.

[0055] Step 6: When the surface temperature of the cold spray layer is below 1100℃, repeat steps 4 and 5, repeating approximately 3 times.

[0056] The test results of the bending strength and deflection of the tested embodiments are shown in Table 1.

[0057] Example 2

[0058] A method for preparing a magnesium-titanium-aluminum composite plate, the composition and mass percentage of each component are as follows: Ti-90wt%, Al: 90wt%, Al-0.5wt%, Ce: 5wt%, Al-20wt%, V: 4wt%, B: 1wt%, the average size of the powder is about 10μm;

[0059] The preparation method is as follows:

[0060] Step 1: Mix Ti-Al powder, Al-Ce alloy powder, Al-V alloy powder, and B powder according to the mass percentage of each component, and mix them in a powder mixer for 8 hours to ensure that the powder is evenly mixed.

[0061] Step 2: Sand the 3mm thick magnesium alloy sheet and clean it with alcohol;

[0062] Step 3: Using a cold spraying process, the powder mixed in Step 1 is evenly sprayed onto the magnesium alloy sheet. The powder needs to be preheated in the powder hopper at a temperature of 400℃. A step-by-step spraying method is used for processing. The distance between the nozzle and the sheet is 20mm; the nozzle moving speed is 20mm / s; the powder feed rate is 20g / min; after cold spraying, the thickness of the cold spray layer is approximately 2mm.

[0063] Step 4: After the above cold spraying is completed, the cold spray layer on the surface of the board is heated using an induction heating coil. The method is as follows: one side of the cold spray layer of the board is placed close to a plate-shaped electromagnetic induction coil, with the board and the plate-shaped induction coil parallel and at a fixed distance, and a staggered relative movement occurs. The electromagnetic induction oscillation range is 0.5MHz, the induction current range is 50A, the distance between the induction coil and the cold spray layer is 2mm, the relative moving speed between the induction coil and the board is 8mm / s, and the heating time is 5s. The temperature is measured during the induction heating process, and heating is stopped when the surface temperature of the cold spray coating reaches 550℃.

[0064] Step 5: When the cold spray layer reaches the required temperature, heat the rolling mill rolls to 300°C to roll the sheet and measure the surface temperature of the cold spray layer.

[0065] Step 6: When the surface temperature of the cold spray layer is below 400℃, repeat steps 4 and 5, repeating approximately 3 times.

[0066] The test results of the bending strength and deflection of the tested embodiments are shown in Table 1.

[0067] Example 3

[0068] A method for preparing a magnesium-titanium-aluminum composite plate, the composition and mass percentage of each component are as follows: Ti-50wt% Al: 90wt%, Al-3wt% Ce: 5wt%, Al-20wt% V: 3wt%, B: 2wt%, the average size of the powder is 10μm;

[0069] The preparation method is as follows:

[0070] Step 1: Mix Ti-Al powder, Al-Ce alloy powder, Al-V alloy powder, and B powder according to the mass percentage of each component, and mix them in a powder mixer for 8 hours to ensure that the powder is evenly mixed.

[0071] Step 2: Sand the 3mm thick magnesium alloy sheet and clean it with alcohol;

[0072] Step 3: Using a cold spraying process, the powder mixed in Step 1 is evenly sprayed onto the magnesium alloy sheet. The powder needs to be preheated in the powder hopper at a temperature of 400℃. A step-by-step spraying method is used for processing. The distance between the nozzle and the sheet is 20mm; the nozzle moving speed is 20mm / s; the powder feed rate is 20g / min. After cold spraying, the thickness of the cold spray layer is approximately 2mm.

[0073] Step 4: After the above cold spraying is completed, the cold spray layer on the surface of the board is heated by an induction heating coil. The method is as follows: one side of the cold spray layer of the board is placed close to a plate-shaped electromagnetic induction coil, the board and the plate-shaped induction coil are parallel and kept at a fixed distance, and a staggered relative movement occurs. The electromagnetic induction oscillation range is 0.8MHz, the induction current range is 60A, the distance between the induction coil and the cold spray layer is 2mm, the relative moving speed between the induction coil and the board is 5mm / s, and the heating time is 8s. The temperature is measured during the induction heating process. When the alloy surface temperature reaches 1300℃, the heating is stopped.

[0074] Step 5: When the cold spray layer reaches the required temperature, heat the rolling mill rolls to 300°C to roll the sheet and measure the surface temperature of the cold spray layer.

[0075] Step 6: When the surface temperature of the cold spray layer is below 1100℃, repeat steps 4 and 5, repeating approximately 3 times.

[0076] The test results of the bending strength and deflection of the tested embodiments are shown in Table 1.

[0077] Comparative Example 1

[0078] The preparation method of magnesium-aluminum alloy plate is carried out by steps one, two, three and four. Steps one, two and three are the same as in Example 1. The coating powder is the same as the coating powder in Example 1. Step four involves high-temperature rolling of the powder and magnesium alloy plate. Specifically, the rolling mill rolls are heated to 300°C, the coated composite plate blank is placed in a vacuum tube furnace for heating at 420°C, and the composite plate is rolled after reaching the temperature.

[0079] Comparative Example 2

[0080] The preparation method of magnesium-aluminum alloy plate is prepared by steps one, two and three. Steps one and two are the same as in Example 1. The coating powder is the same as the coating powder in Example 1. Step three involves explosive welding of the powder and magnesium alloy plate. Specifically, aluminum alloy plates are used to reinforce both sides of the magnesium alloy plate, and explosive welding is performed. Ammonium nitrate fuel is used to perform instantaneous explosive welding in a pit to produce magnesium-titanium-aluminum alloy plate.

[0081] Comparative Example 3

[0082] The preparation method is the same as in Example 1, except that the coating composition is as follows: pure Ti: 90wt%, pure Ce: 7wt%, Al-50wt%, V: 2wt%, B: 1wt%.

[0083] Comparative Example 4

[0084] The preparation method is the same as in Example 1, except that the coating composition is as follows: Ti-90wt% Al: 81wt%, Al-0.5wt% Ce: 5wt%, Al-20wt% V: 4wt%, B: 10wt%.

[0085] The flexural strength and deflection properties of the composite plates prepared in the examples and comparative examples were detected, and the results are shown in Table 1.

[0086] Table 1 Performance data of composite panels prepared in the examples and comparative examples

[0087] Sample (T6) Flexural strength (MPa) Deflection (mm) Example 1 520 0.8 Example 2 583 0.7 Example 3 611 0.7 Comparative Example 1 320 0.2 Comparative Example 2 350 0.3 Comparative Example 3 150 0.1 Comparative Example 4 100 0.05

[0088] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0089] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A preparation process for a magnesium-titanium-aluminum composite material, comprising the following steps: A) Mix Ti-Al alloy powder, Al-RE alloy powder, Al-V alloy powder and B powder to obtain a mixed powder; B) The mixed powder is preheated and then sprayed onto the surface of the magnesium alloy to obtain a sprayed coating; C) The sprayed coating is induction heated to a temperature greater than 3 / 4 of the melting point of the sprayed coating; D) Roll the initial magnesium-titanium-aluminum composite material obtained in step C); E) Detect the surface temperature of the coating after rolling. When the surface temperature of the coating is lower than 2 / 3 of the melting point, repeat steps C) and D) in sequence, repeating 3 to 10 times to obtain magnesium-titanium-aluminum composite material. When the surface temperature of the coating is higher than or equal to 2 / 3 of the melting point, magnesium-titanium-aluminum composite material is obtained. The content of the Ti-Al alloy powder is 1~95wt%, the content of the Al-RE alloy powder is 1~95wt%, the content of the Al-V alloy powder is 1~30wt%, and the content of the B powder is 0.1~3wt%. The Ti-Al alloy powder contains 3 to 99 wt% Al, the Al-RE alloy powder contains 0.1 to 90 wt% RE, and the Al-V alloy powder contains 0.1 to 60 wt% V.

2. The preparation process according to claim 1, characterized in that, RE is selected from one or more of La, Ce, Nd, Sm, Gd, Y, Dy, Ho, Er, Yb, and Eu.

3. The preparation process according to claim 1, characterized in that, The spraying method is selected from one or more of flame spraying, explosive spraying, supersonic spraying, arc spraying, plasma spraying, electro-explosive spraying, induction heating spraying, capacitor discharge spraying, laser spraying, and cold spraying. The spraying is carried out using a step-by-step spraying method, with the distance between the nozzle and the magnesium alloy being 5mm to 60mm, the nozzle moving speed being 2mm / s to 40mm / s, and the nozzle powder feeding rate being 10g / min to 200g / min.

4. The preparation process according to claim 1, characterized in that, The preheating temperature is 300~500℃, and the thickness of the sprayed coating is 50μm~3mm.

5. The preparation process according to claim 1, characterized in that, The oscillation frequency of the induction heating coil is 500KHz~1.2MHz, and the induced current is 10~300A.

6. The preparation process according to claim 1, characterized in that, The distance between the induction heating coil and the sprayed coating is 1mm to 30mm, the relative moving speed between the induction heating coil and the magnesium alloy plate is 0.1 to 10mm / s, and the induction heating time is 2 to 20s.

7. The preparation process according to claim 1, characterized in that, The rolls are heated to above 200°C before rolling.

8. The magnesium-titanium-aluminum composite material prepared by the preparation process according to claim 1 is composed of a magnesium alloy and a coating on the surface of the magnesium alloy, wherein the coating is prepared from Ti-Al alloy, Al-RE alloy, Al-V alloy and B.

9. The magnesium-titanium-aluminum composite material according to claim 8, characterized in that, The coating includes one or more of Ti3Al, TiAl, Al2Ti, and Al3Ti.