Mg-al-ta composite plate based on corrugation rolling and laser irradiation cooperation and preparation method

Abstract

The application relates to preparation of a dissimilar metal composite plate, in particular to a Mg-Al-Ta composite plate based on corrugated rolling and laser irradiation cooperation and a preparation method, which comprises the following steps: S1, providing an aluminum plate, a tantalum plate and an AZ31 magnesium alloy plate with a bimodal separated non-basal plane texture; S2, performing wave flat room temperature rolling on the AZ31 magnesium alloy plate, so that the surface of the AZ31 magnesium alloy plate combined with the aluminum plate is a concave-convex stripe surface; the aluminum plate and the AZ31 magnesium alloy plate are contacted and stacked and the edges of the two are fixedly connected, so that a Mg-Al composite plate blank is obtained; S3, placing the tantalum plate and the Mg-Al composite plate blank in an atmosphere protection box and filling the box with inert gas; S4, heating the surface of the tantalum plate combined with the aluminum plate in the atmosphere protection box by using a laser irradiation mode; then performing single-pass medium-temperature rolling and compounding; S5, sequentially performing deep cooling treatment and high-temperature diffusion annealing treatment, so that the Mg-Al-Ta composite plate based on corrugated rolling and laser irradiation cooperation is obtained. The Mg-Al-Ta composite plate can improve the interface bonding strength.

Description

Technical Field

[0001] This invention relates to the preparation of dissimilar metal composite plates, specifically to a Mg-Al-Ta composite plate based on the synergy of corrugated rolling and laser irradiation, and its preparation method. Background Technology

[0002] High-energy charged particles in the deep space environment have extremely strong penetrating power and can easily trigger space electron radiation, causing damage to electronic components inside spacecraft. Therefore, it is necessary to upgrade and modify existing materials and processes to achieve lightweight construction, designing layered composite panels with characteristics such as radiation resistance and lightweight properties.

[0003] According to the research in "Optimization Design of Radiation Vault in Jupiter Orbiting Mission [J]" (JZ Wang, JN Ma, JW Qiu, D. Tian, ​​AW Zhu, QX Zhang, AS Zhou. IEEE Transactions on Nuclear Science, (66) 2019, 2179-2187.), Mg-Ta composite plates can effectively solve the above problems. Currently, Mg-Ta composite plates are mainly prepared by rolling. However, due to the significant differences in physical properties between magnesium (Mg) and tantalum (Ta), such as low mutual solubility, different crystal structures, and mismatched thermal expansion coefficients, it is difficult to coordinate the deformation of the two during rolling, which aggravates the interface mismatch and stress concentration during the rolling process, and easily leads to problems such as interlayer delamination or cracking during the rolling forming process. There is an urgent need to improve the traditional rolling composite process.

[0004] Chinese patent CN114289504A discloses a copper / high-carbon steel composite material, its dedicated V-shaped gas shield, laser-assisted preparation method, and application. This method reduces dependence on rolling deformation and avoids the problem of poor deformation coordination. However, this preparation method does not involve liquid nitrogen cryogenic treatment and high-temperature diffusion annealing, resulting in limited bonding ability at the interface of the composite plate. Chinese patent CN114192580A discloses a method for preparing a cross-corrugated interface metal composite plate. This method compensates for the difference in elongation between the difficult-to-deform metal composite plate and the easily deformable metal substrate, solving the problem of plate warping. However, this preparation method cannot avoid generating large shear forces during rolling, leading to poor bonding performance between the plates. Chinese patent CN112742870A discloses a method for preparing a shielded magnesium-Ta multilayer composite plate. Although it can realize the processing and preparation of Mg-Ta composite plates, its process involves high-temperature rolling in a vacuum to avoid oxidation of the plate, placing high demands on rolling equipment and the rolling environment, and resulting in low production efficiency.

[0005] In summary, the preparation of high-quality Mg-Ta composite plates requires comprehensive optimization of multiple aspects, including the forming performance of magnesium plates, surface treatment, atmosphere protection, heating method, cryogenic treatment, diffusion annealing, and rolling process, in order to solve the problems faced by existing technologies and obtain composite plates with excellent performance. Summary of the Invention

[0006] The purpose of this invention is to develop a Mg-Al-Ta composite plate and its preparation method based on the synergistic process of corrugated rolling and laser irradiation, which can improve the interfacial bonding strength of the Mg-Al-Ta composite plate and lay the foundation for the engineering application of this type of composite plate.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides a method for preparing Mg-Al-Ta composite plates based on the synergistic effect of corrugated rolling and laser irradiation, comprising the following steps:

[0009] S1 offers aluminum plates, tantalum plates, and AZ31 magnesium alloy plates with bimodal separation non-basal texture;

[0010] S2, the AZ31 magnesium alloy plate is subjected to room temperature rolling to make the surface of the AZ31 magnesium alloy plate and the aluminum plate together have a textured surface; then the aluminum plate and the textured surface of the AZ31 magnesium alloy plate are stacked in contact and the edges of the two are fixed together to obtain the Mg-Al composite plate blank.

[0011] S3, place the tantalum plate and Mg-Al composite plate blank in an atmosphere protection box, and fill the atmosphere protection box with inert gas to achieve atmosphere protection;

[0012] S4, In an atmosphere-protected chamber, the surfaces of the tantalum plate and aluminum plate to be bonded are heated by laser irradiation to reduce the deformation resistance of the tantalum plate to be bonded surface; then, the Mg-Al composite plate blank and the heated tantalum plate are subjected to single-pass medium-temperature rolling to obtain a deformed plate; the aluminum plate in the deformed plate is located between the AZ31 magnesium alloy plate and the tantalum plate.

[0013] S5, the deformed sheet is subjected to cryogenic treatment and high-temperature diffusion annealing in sequence to obtain Mg-Al-Ta composite sheet based on the synergy of corrugated rolling and laser irradiation.

[0014] Furthermore, the process parameters for the corrugated room temperature rolling in S2 include: single-pass corrugated room temperature rolling, a rolling pass thinning rate of 15~25%, and one of the upper and lower rolls being a corrugated roll.

[0015] Furthermore, the oxygen content in the atmosphere protection chamber of S3 is 0.5~1.0%.

[0016] Furthermore, in S4, laser irradiation is used to heat the surface where the tantalum plate and aluminum plate are bonded to 400~800℃.

[0017] Furthermore, the laser irradiation angle is 15~65°, and the energy density is 50~300W / mm². 2 .

[0018] Furthermore, in S4, the roll temperature for medium-temperature rolling is 180~240℃, the thinning rate per rolling pass is 30~60%, and the roll speed is 10~60m / min.

[0019] Furthermore, in S5, liquid nitrogen is used to perform cryogenic treatment on the deformed sheet metal, and the cryogenic treatment time is 60~600min.

[0020] Furthermore, the uniform pressure of the high-temperature diffusion annealing treatment in S5 is 0.05~0.15MPa, the annealing temperature is 300~450℃, and the annealing time is 60~300min.

[0021] Furthermore, in S1, the provided tantalum plate and the AZ31 magnesium alloy plate with bimodal separation non-basal surface texture are subjected to surface polishing treatment to remove surface oxides and contaminants.

[0022] Secondly, the present invention provides a Mg-Al-Ta composite plate based on the synergy of corrugated rolling and laser irradiation, which is prepared by the above-mentioned method for preparing Mg-Al-Ta composite plates based on the synergy of corrugated rolling and laser irradiation.

[0023] The beneficial effects of this invention are:

[0024] 1. The AZ31 magnesium alloy plate and aluminum plate bonded by this invention have a textured surface, which is beneficial for increasing the contact area between dissimilar metal plates during the subsequent hot rolling process of the composite plate, enabling better mechanical interlocking between the dissimilar metal plates. Simultaneously, heating the bonding surface of the tantalum plate and aluminum plate in an inert gas protective atmosphere using laser irradiation reduces the deformation resistance of the tantalum plate's bonding surface, improves the coordinated deformation capability at the interface of the composite plate, reduces interlayer shear stress in the dissimilar metal plates, and helps improve the interfacial bonding strength of the composite plate. Combined with subsequent cryogenic treatment, residual stress inside the composite plate is effectively released while avoiding warping and interlayer cracking. Furthermore, cryogenic treatment does not introduce oxide inclusions at the interface of the composite plate, which is beneficial for improving the interfacial bonding quality during subsequent high-temperature diffusion annealing. Combined with subsequent high-temperature diffusion annealing, a Mg-Al-Ta composite plate with good interfacial bonding is obtained. This invention provides a feasible process route and theoretical guidance for the forming and preparation of Mg-Al-Ta composite plates, laying the foundation for the engineering application of this type of composite plate.

[0025] 2. The magnesium alloy plate provided by this invention is an AZ31 magnesium alloy plate with a bimodal separation non-base surface texture, which replaces the traditional base surface textured magnesium alloy plate. It ensures that a large deformation amount (15%~25%) can be achieved in a single pass without edge cracking during room temperature wave rolling, and ensures that a large deformation amount (30%~60%) can be achieved in a single pass without significant edge cracking during subsequent medium temperature rolling. This avoids the problem that base surface textured plates are prone to cracking under corresponding deformation conditions.

[0026] 3. In this invention, tantalum plate and Mg-Al composite plate blank are placed in an atmosphere protection box and inert gas is introduced into the atmosphere protection box to achieve atmosphere protection, which effectively avoids the introduction of oxide inclusions at the interface during laser irradiation or medium-temperature rolling deformation, and helps to improve the interface bonding strength of the composite plate.

[0027] 4. In the cryogenic treatment process of this invention, the liquid nitrogen used is a by-product of the oxygen production industry. It is inexpensive, widely available, energy-saving, easy to store and transport, chemically stable, non-toxic and pollution-free, and extremely low in cost. Attached Figure Description

[0028] Figure 1 This is a flowchart of the preparation method of Mg-Al-Ta composite plate based on the synergistic effect of corrugated rolling and laser irradiation as described in the embodiments of the present invention.

[0029] Figure 2 This is a SEM image of the composite interface of the Mg-Al-Ta composite plate obtained in Example 1 of this invention.

[0030] Figure 3 This is a SEM image of the composite interface of the Mg-Al-Ta composite plate obtained in Example 2 of the present invention. Detailed Implementation

[0031] 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.

[0032] In one embodiment, see Figure 1 As shown, this invention provides a method for preparing Mg-Al-Ta composite plates based on the synergistic effect of corrugated rolling and laser irradiation, which includes the following steps:

[0033] S1 offers aluminum plates, tantalum plates, and AZ31 magnesium alloy plates with bimodal separation non-basal texture.

[0034] S2, the AZ31 magnesium alloy plate is subjected to room temperature rolling to make the surface of the AZ31 magnesium alloy plate and the aluminum plate together have a textured surface; then the aluminum plate and the textured surface of the AZ31 magnesium alloy plate are stacked in contact and the edges of the two are fixed together to obtain the Mg-Al composite plate blank.

[0035] S3. The tantalum plate and Mg-Al composite plate blank are placed in an atmosphere protection chamber, and an inert gas is introduced into the atmosphere protection chamber to achieve atmosphere protection.

[0036] S4. In a protective atmosphere chamber, the surfaces where the tantalum plate and aluminum plate are to be bonded are heated by laser irradiation to reduce the deformation resistance of the tantalum plate surface to be bonded. Then, the Mg-Al composite plate blank and the heated tantalum plate are subjected to single-pass medium-temperature rolling to obtain a deformed plate; the aluminum plate in the deformed plate is located between the AZ31 magnesium alloy plate and the tantalum plate.

[0037] S5, the deformed sheet is subjected to cryogenic treatment and high-temperature diffusion annealing in sequence to obtain Mg-Al-Ta composite sheet based on the synergy of corrugated rolling and laser irradiation.

[0038] The AZ31 magnesium alloy plate and aluminum plate bonded by this invention have a textured, wavy surface, which helps to increase the contact area between dissimilar metal plates during the subsequent hot rolling process of the composite plate, enabling better mechanical interlocking between the dissimilar metal plates. Simultaneously, heating the bonding surface of the tantalum plate and aluminum plate in an inert gas protective atmosphere using laser irradiation reduces the deformation resistance of the tantalum plate's bonding surface, improves the coordinated deformation capability at the interface of the composite plate, reduces interlayer shear stress in the dissimilar metal plates, and helps to improve the interfacial bonding strength of the composite plate. Furthermore, combined with subsequent cryogenic treatment, residual stress within the composite plate is effectively released while avoiding warping and interlayer cracking. Cryogenic treatment also avoids introducing oxide inclusions at the interface of the composite plate, which is beneficial for improving the interfacial bonding quality during subsequent high-temperature diffusion annealing. Combined with subsequent high-temperature diffusion annealing, a Mg-Al-Ta composite plate with good interfacial bonding is obtained. This invention provides a feasible process route and theoretical guidance for the forming and preparation of Mg-Ta composite plates, laying the foundation for the engineering application of this type of composite plate.

[0039] It should be noted that this application only specifies the stacking order of the AZ31 magnesium alloy plate, aluminum plate, and heated tantalum plate, and does not specify the specific number of stacked layers. For example, the composite material can be a three-layer composite structure, including an AZ31 magnesium alloy plate, an aluminum plate, and a tantalum plate arranged sequentially from top to bottom. The composite material can also be a five-layer composite structure, including an AZ31 magnesium alloy plate, an aluminum plate, a tantalum plate, another aluminum plate, and an AZ31 magnesium alloy plate arranged sequentially from top to bottom, with an aluminum plate of a predetermined thickness placed between the AZ31 magnesium alloy plate and the tantalum plate. Similarly, the specific number of layers in the composite material is reasonably determined based on the number of composite layers of the AZ31 magnesium alloy plate and the tantalum plate, with an aluminum plate of a predetermined thickness placed between adjacent AZ31 magnesium alloy plates and tantalum plates.

[0040] In a preferred embodiment, the process parameters for the corrugated room temperature rolling in S2 include: single-pass corrugated room temperature rolling, a rolling pass thinning rate of 15-25%, and one of the upper and lower rolls being a corrugated roll.

[0041] The surface of the AZ31 magnesium alloy sheet bonded to the aluminum sheet can be formed into a textured surface with concave and convex stripes through single-pass large deformation rolling, which is convenient and quick to operate. Furthermore, due to the use of AZ31 magnesium alloy sheet with bimodal separation non-basal surface texture, a large deformation amount (15%~25%) can be achieved in a single pass during room temperature wave rolling without edge cracking, thus ensuring rolling quality.

[0042] In a preferred embodiment, the oxygen content in the atmosphere protection chamber in S3 is 0.5~1.0%. By reasonably limiting the oxygen content in the atmosphere protection chamber, the introduction of oxide inclusions at the interface during laser irradiation or medium-temperature rolling deformation is effectively avoided, which is beneficial to improving the interfacial bonding strength of the composite material.

[0043] In a preferred embodiment, in step S4, laser irradiation is used to heat the surface where the tantalum plate and the aluminum plate are bonded to 400-800°C. By reasonably limiting the heating temperature, the following effects are achieved:

[0044] 1) Reduced deformation resistance: Within this temperature range, the surface of the tantalum plate softens to some extent, thereby reducing its deformation resistance. This makes it easier for the tantalum plate to form a good bond with other layer materials (such as aluminum plates) during subsequent rolling processes, reducing the problem of poor bonding caused by differences in material hardness.

[0045] 2) Maintaining material properties: Although heating can reduce the material's resistance to deformation, excessively high temperatures may lead to degradation of material properties, such as grain growth and reduced hardness. Therefore, controlling the temperature between 400 and 800℃ can achieve the goal of reducing deformation resistance while preserving the material's basic properties from excessive impact.

[0046] 3) Promotes atomic diffusion: Appropriate heating can promote the thermal motion of atoms on the material surface and increase the diffusion rate between atoms. In the subsequent rolling and high-temperature diffusion annealing processes, this diffusion helps to form a tighter metallurgical bonding interface and improve the overall performance of Mg-Al-Ta composite plates.

[0047] Preferably, the laser irradiation angle is 15~65° and the energy density is 50~300W / mm². 2 By precisely controlling the laser irradiation angle and energy density, it is possible to achieve precise heating and modification of the surfaces on which tantalum and aluminum plates will be bonded, laying a solid foundation for the subsequent rolling composite process.

[0048] In a preferred embodiment, the roll temperature in S4 for medium-temperature rolling is 180~240°C, the thinning rate per rolling pass is 30~60%, and the roll speed is 10~60m / min.

[0049] The roll temperature is set between 180 and 240°C. Within this temperature range, aluminum and AZ31 magnesium alloy plates exhibit good plasticity, making them easier to deform during rolling, which is beneficial for the bonding between material layers. Appropriate roll temperature reduces the rolling force required during rolling, minimizes wear on the rolls and materials, and extends the equipment's service life. Maintaining the roll temperature within a certain range helps ensure uniform heating of the material during rolling, avoiding uneven performance caused by localized overheating or undercooling.

[0050] The thinning rate of each rolling pass is set to 30-60%. Since the magnesium alloy plate of the raw material is AZ31 magnesium alloy plate with bimodal separation and non-basal surface texture, the risk of cracking is low, thus enabling large deformation rolling in a single pass, providing a basis for the effective composite of Mg, Al and Ta.

[0051] The roll speed is set to 10~60m / min. An appropriate roll speed helps ensure uniform deformation of the material during rolling, avoiding problems such as uneven thickness and surface roughness. Furthermore, since the raw material magnesium alloy plate is an AZ31 magnesium alloy plate with a bimodal separation non-basal surface texture, the risk of cracking is low. Therefore, compared with conventional magnesium alloy plate composite rolling, the rolling speed can be appropriately increased to improve rolling efficiency and shorten the production cycle.

[0052] In summary, by precisely controlling parameters such as roll temperature, thinning rate per rolling pass, and roll speed during the medium-temperature rolling process, effective deformation and composite processing of materials can be achieved, thereby producing high-quality Mg-Al-Ta composite plates.

[0053] In a preferred embodiment, liquid nitrogen is used to perform cryogenic treatment on the deformed sheet material in step S5, and the cryogenic treatment time is 60~600min.

[0054] Liquid nitrogen is a byproduct of the oxygen production industry. It is inexpensive, has a wide range of raw material sources, saves energy, is easy to store and transport, has stable chemical properties, is non-toxic and pollution-free, and has extremely low cost.

[0055] The specific selection of cryogenic treatment time should be determined comprehensively based on factors such as material thickness, performance requirements, production efficiency, equipment capacity, and cost considerations. In practice, the impact of different treatment times on material properties can be verified through experiments to find the optimal treatment time parameters.

[0056] In a preferred embodiment, the uniform pressure of the high-temperature diffusion annealing treatment in S5 is 0.05~0.15MPa, the annealing temperature is 300~450℃, and the annealing time is 60~300min.

[0057] The uniform pressure is set to 0.05~0.15MPa. An appropriate uniform pressure helps promote uniform deformation and diffusion of the material during annealing, thereby enhancing the metallurgical bond between layers. Too low a pressure may not be enough to drive sufficient diffusion, while too high a pressure may cause excessive stress inside the material, or even cause deformation or cracking.

[0058] The annealing temperature is set at 300~450℃. As the annealing temperature increases, the atomic movement within the material intensifies, which helps promote atomic diffusion between layers, thereby enhancing metallurgical bonding. High-temperature annealing may also trigger phase transformations and microstructure evolution within the material, such as grain growth and recrystallization, which have a significant impact on the material's mechanical properties. However, excessively high annealing temperatures may cause the material to overheat, damaging its internal structure and thus reducing its performance.

[0059] Annealing time is set between 60 and 300 minutes. Sufficient annealing time ensures adequate diffusion within the material, forming a strong metallurgical bond. As annealing time increases, the internal microstructure of the material gradually stabilizes, and its properties become more consistent. However, excessively long annealing times reduce production efficiency and increase energy consumption and production costs.

[0060] In a preferred embodiment, in S1, the provided tantalum plate and the AZ31 magnesium alloy plate with a bimodal separation non-basal surface texture are subjected to surface polishing treatment to remove surface oxides and contaminants.

[0061] The following will illustrate this with specific examples.

[0062] Example 1: A method for preparing Mg-Al-Ta composite plates based on the synergistic effect of corrugated rolling and laser irradiation, comprising the following steps:

[0063] S1 offers aluminum plates, tantalum plates, and AZ31 magnesium alloy plates with bimodal separation non-basal texture.

[0064] The aluminum plate is a 1060 aluminum alloy sheet with an initial thickness of 0.1 mm. The tantalum plate has a purity of 99.95% and an initial thickness of 1.2 mm. The AZ31 magnesium alloy plate with a bimodal non-basal texture has an initial thickness of 1.2 mm. The chemical composition of the intermediate layer between the AZ31 magnesium alloy sheet and the 1060 aluminum sheet should comply with the provisions of national standards GB / T5153-2016 and GB / T3190-2020.

[0065] An angle grinder was used to pre-treat the surface of tantalum plates and AZ31 magnesium alloy plates with bimodal separation non-basal surface texture to remove surface oxides and contaminants.

[0066] S2, the AZ31 magnesium alloy sheet is subjected to room temperature corrugated rolling, resulting in a textured, wavy surface where the AZ31 magnesium alloy sheet and the aluminum sheet are bonded. Specifically: the bimodal, non-basal textured AZ31 magnesium alloy sheet is placed in a corrugated mill for room temperature rolling, with one rolling pass and a thinning rate of 20%. The upper roll of the corrugated mill is a unidirectional corrugated roll, the surface of which is a unidirectional corrugated curved surface formed by transverse corrugations. The lower roll is a flat roll. After rolling, the upper surface of the AZ31 magnesium alloy sheet is a unidirectional corrugated surface, and the lower surface is a flat surface. The aluminum sheet is stacked on the unidirectional corrugated surface on the upper side of the AZ31 magnesium alloy sheet, and the edges of the aluminum sheet and the AZ31 magnesium alloy sheet are fixed together to obtain a Mg-Al composite plate blank.

[0067] S3. Place the tantalum plate and Mg-Al composite plate blank in an atmosphere protection chamber and fill the atmosphere protection chamber with argon gas, controlling the oxygen content at 0.8% to achieve atmosphere protection.

[0068] S4. In the atmosphere-protected chamber, the surface where the tantalum plate and aluminum plate are bonded is heated by laser irradiation. Specifically, a laser is used to heat the surface where the tantalum plate and aluminum plate are bonded, with the laser irradiation angle set to 45° and the energy density set to 180W / mm². 2 The temperature of the Ta plate heating position is 480℃, ensuring that the laser irradiation energy can significantly reduce the deformation resistance of the tantalum plate at the bonding position.

[0069] Then, the Mg-Al composite plate blank and the heated tantalum plate are immediately subjected to single-pass medium-temperature rolling to obtain a deformed plate; the aluminum plate in the deformed plate is located between the AZ31 magnesium alloy plate and the tantalum plate. Specifically, the rolling roll temperature is set to 200℃, the thinning rate per rolling pass is set to 40%, and the upper and lower roll speeds are set to 20m / min.

[0070] S5. The deformed sheet material is placed in liquid nitrogen for cryogenic treatment, and the cryogenic treatment time is set to 120 minutes.

[0071] The cryogenically treated composite board was subjected to high-temperature diffusion annealing. The uniform pressure was set to 0.08 MPa, the diffusion annealing temperature was set to 350℃, the diffusion annealing time was set to 240 min, and the cooling method was furnace cooling. Finally, a Mg-Al-Ta composite board with good interfacial bonding was obtained.

[0072] The surface quality and electron microscopy (SEM) of the prepared Mg-Al-Ta composite plate were observed. The results are shown in [link to SEM document]. Figure 2As shown, the Mg-Al-Ta composite plate prepared in Example 1 had good surface quality, with no obvious cracks at the edges. The diffusion widths at the Mg-Al and Al-Ta interfaces were 9.4 μm and 7.8 μm, respectively. The interface layer was free of voids and cracks, and the interface bonding was good, with the composite plate achieving an interface bonding strength of ~106 MPa.

[0073] Example 2: A method for preparing Mg-Al-Ta composite plates based on the synergistic effect of corrugated rolling and laser irradiation, comprising the following steps:

[0074] S1 offers aluminum plates, tantalum plates, and AZ31 magnesium alloy plates with bimodal separation non-basal texture.

[0075] The aluminum plate is a 1060 aluminum alloy sheet with an initial thickness of 0.2 mm. The tantalum plate has a purity of 99.95% and an initial thickness of 2.0 mm. The AZ31 magnesium alloy plate with a bimodal non-basal texture has an initial thickness of 2.0 mm. The chemical composition of the intermediate layer between the AZ31 magnesium alloy sheet and the 1060 aluminum sheet should comply with the provisions of national standards GB / T5153-2016 and GB / T3190-2020.

[0076] An angle grinder was used to pre-treat the surface of tantalum plates and AZ31 magnesium alloy plates with bimodal separation non-basal surface texture to remove surface oxides and contaminants.

[0077] S2, the AZ31 magnesium alloy sheet is subjected to room temperature corrugated rolling, resulting in a textured, wavy surface where the AZ31 magnesium alloy sheet and the aluminum sheet are bonded. Specifically: the bimodal, non-basal textured AZ31 magnesium alloy sheet is placed in a corrugated mill for room temperature rolling, with one rolling pass and a thinning rate of 25%. The upper roll of the corrugated mill is a unidirectional corrugated roll, the surface of which is a unidirectional corrugated curved surface formed by longitudinal corrugations. The lower roll is a flat roll. After rolling, the upper surface of the AZ31 magnesium alloy sheet is a unidirectional corrugated surface, and the lower surface is a flat surface. The aluminum sheet is stacked on the unidirectional corrugated surface on the upper side of the AZ31 magnesium alloy sheet, and the edges of the aluminum sheet and the AZ31 magnesium alloy sheet are fixed together to obtain a Mg-Al composite plate blank.

[0078] S3. Place the tantalum plate and Mg-Al composite plate blank in an atmosphere protection chamber and fill the atmosphere protection chamber with argon gas, controlling the oxygen content at 0.1% to achieve atmosphere protection.

[0079] S4. In a protected atmosphere chamber, the surface where the tantalum plate and aluminum plate are bonded is heated by laser irradiation. A laser is used to heat the bonded surface of the tantalum plate and aluminum plate; the laser irradiation angle is set to 45°, and the energy density is set to 240 W / mm². 2The temperature of the Ta plate heating position is 550℃ to ensure that the laser irradiation energy can significantly reduce the deformation resistance of the tantalum plate at the bonding position.

[0080] Then, the Mg-Al composite plate blank and the heated tantalum plate are immediately subjected to single-pass medium-temperature rolling to obtain a deformed plate; the aluminum plate in the deformed plate is located between the AZ31 magnesium alloy plate and the tantalum plate. Specifically, the rolling roll temperature is set to 240℃, the rolling pass thinning rate is set to 50%, and the upper and lower roll speeds are set to 30m / min.

[0081] S5. The deformed sheet material is placed in liquid nitrogen for cryogenic treatment, and the cryogenic treatment time is set to 300 minutes.

[0082] The cryogenically treated composite board was subjected to high-temperature diffusion annealing. The uniform pressure was set to 0.10 MPa, the diffusion annealing temperature was set to 380℃, the diffusion annealing time was set to 300 min, and the cooling method was furnace cooling. Finally, a Mg-Al-Ta composite board with good interfacial bonding was obtained.

[0083] The surface quality and electron microscopy (SEM) of the prepared Mg-Al-Ta composite plate were observed. The results are shown in [link to SEM document]. Figure 3 As shown, the Mg-Al-Ta composite plate prepared in Example 2 had good surface quality, with no obvious cracks at the edges. The diffusion widths at the Mg-Al and Al-Ta interfaces were 9.1 μm and 7.5 μm, respectively. The interface layer was free of voids and cracks, and the interface bonding was good, with the composite plate achieving an interface bonding strength of ~102 MPa.

[0084] To compare and verify the beneficial effects of the present invention, the following comparative examples were set up, specifically including:

[0085] Comparative Example 1: A method for preparing a Mg-Al-Ta composite plate, the only difference between this method and Example 1 is that the selected AZ31 magnesium alloy plate has a base surface texture feature.

[0086] Comparative Example 2: A method for preparing a Mg-Al-Ta composite plate, the only difference between this method and Example 1 is that the tantalum plate was not heated by laser irradiation.

[0087] Comparative Example 3: A method for preparing Mg-Al-Ta composite plates. The only difference between this method and Example 1 is that the deformed plates obtained by medium-temperature rolling are not subjected to cryogenic treatment.

[0088] Comparative Example 4: A method for preparing a Mg-Al-Ta composite plate, the only difference between this method and Example 1 is that the surface where the AZ31 magnesium alloy plate and the aluminum plate are bonded is planar.

[0089] In Comparative Example 1, cracks appeared on both sides of the AZ31 magnesium alloy sheet with a base surface texture after a single-pass room temperature wave rolling with a 20% thinning rate. After a subsequent single-pass medium-temperature rolling with a 40% thinning rate, the edge cracks extended to the core of the sheet, and interlayer cracking of the composite sheet occurred. This indicates that the use of bimodal separation non-base surface textured AZ31 magnesium alloy sheet is the key factor for the successful preparation of the Mg-Al-Ta composite sheet in this invention.

[0090] The composite plate prepared in Comparative Example 2 showed good surface quality with no obvious cracks at the edges. However, the Mg-Al and Al-Ta interfacial diffusion widths of the composite plate obtained in this comparative example were 5.4 μm and 3.9 μm, respectively, and the interfacial bonding strength was ~53 MPa, which was significantly lower than the test results of Example 1. This indicates that heating the tantalum plate with laser irradiation is the key factor for the successful preparation of the Mg-Al-Ta composite plate in this invention.

[0091] The failure to prepare the composite board in Comparative Example 3, namely the occurrence of warping and interlayer cracking, indicates that using cryogenic treatment to release residual stress is the key factor for the successful preparation of the Mg-Al-Ta composite board in this invention.

[0092] The composite plate prepared in Comparative Example 4 showed good surface quality with no obvious cracks at the edges. However, the diffusion widths of the Mg-Al and Al-Ta interfaces in this comparative example were 6.1 μm and 4.3 μm, respectively, and the interfacial bonding strength was ~67 MPa, significantly lower than the test results of Example 1. This indicates that the uneven, striped surface of the AZ31 magnesium alloy plate bonded to the aluminum plate is a key factor in the successful preparation of the Mg-Al-Ta composite plate in this invention.

[0093] 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 Mg-Al-Ta composite plates based on the synergistic effect of corrugated rolling and laser irradiation, characterized in that, Includes the following steps: S1 offers aluminum plates, tantalum plates, and AZ31 magnesium alloy plates with bimodal separation non-basal texture; S2, the AZ31 magnesium alloy plate is subjected to room temperature rolling to make the surface of the AZ31 magnesium alloy plate and the aluminum plate together have a textured surface; then the aluminum plate and the textured surface of the AZ31 magnesium alloy plate are stacked in contact and the edges of the two are fixed together to obtain the Mg-Al composite plate blank. S3, place the tantalum plate and Mg-Al composite plate blank in an atmosphere protection box, and fill the atmosphere protection box with inert gas to achieve atmosphere protection; S4, In an atmosphere-protected chamber, the surfaces of the tantalum plate and aluminum plate to be bonded are heated by laser irradiation to reduce the deformation resistance of the tantalum plate to be bonded surface; then, the Mg-Al composite plate blank and the heated tantalum plate are subjected to single-pass medium-temperature rolling to obtain a deformed plate; the aluminum plate in the deformed plate is located between the AZ31 magnesium alloy plate and the tantalum plate. S5, the deformed sheet is subjected to cryogenic treatment and high-temperature diffusion annealing in sequence to obtain Mg-Al-Ta composite sheet based on the synergy of corrugated rolling and laser irradiation.

2. The method for preparing Mg-Al-Ta composite plates based on the synergistic effects of corrugated rolling and laser irradiation according to claim 1, characterized in that: The process parameters for the corrugated room temperature rolling in S2 include: single-pass corrugated room temperature rolling, a thinning rate of 15-25% per rolling pass, and one of the upper and lower rolls being a corrugated roll.

3. The method for preparing Mg-Al-Ta composite plates based on the synergistic effects of corrugated rolling and laser irradiation according to claim 1, characterized in that: The oxygen content in the atmosphere protection chamber of S3 is 0.5~1.0%.

4. The method for preparing Mg-Al-Ta composite plates based on the synergistic effects of corrugated rolling and laser irradiation according to claim 1, characterized in that: In S4, laser irradiation is used to heat the surface where the tantalum plate and aluminum plate are bonded to 400~800℃.

5. The method for preparing Mg-Al-Ta composite plates based on the synergistic effects of corrugated rolling and laser irradiation according to claim 4, characterized in that: The laser irradiation angle is 15~65°, and the energy density is 50~300W / mm². 2 .

6. The method for preparing Mg-Al-Ta composite plates based on the synergistic effects of corrugated rolling and laser irradiation according to claim 1, characterized in that: In S4, the roll temperature for medium-temperature rolling is 180~240℃, the thinning rate per rolling pass is 30~60%, and the roll speed is 10~60m / min.

7. The method for preparing Mg-Al-Ta composite plates based on the synergistic effects of corrugated rolling and laser irradiation according to claim 1, characterized in that: In S5, liquid nitrogen is used to perform cryogenic treatment on deformed plates for a period of 60 to 600 minutes.

8. The method for preparing Mg-Al-Ta composite plates based on the synergistic effects of corrugated rolling and laser irradiation according to claim 1, characterized in that: The uniform pressure of the high-temperature diffusion annealing treatment in S5 is 0.05~0.15MPa, the annealing temperature is 300~450℃, and the annealing time is 60~300min.

9. The method for preparing Mg-Al-Ta composite plates based on the synergistic effects of corrugated rolling and laser irradiation according to claim 1, characterized in that: In S1, the provided tantalum plate and the AZ31 magnesium alloy plate with bimodal separation non-basal surface texture are surface polished to remove surface oxides and contaminants.

10. A Mg-Al-Ta composite sheet based on the synergistic effect of corrugated rolling and laser irradiation, characterized in that: The Mg-Al-Ta composite plate was prepared by the method described in any one of claims 1 to 9, which is based on the synergistic process of corrugated rolling and laser irradiation.

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