A method for preparing a high-strength aluminum / ti2alnab / high-strength aluminum three-layer composite plate through metastable rolling

Abstract

The application relates to a method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate through metastable rolling, and relates to a method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate. The application aims at solving the problem that the prior art is difficult to prepare a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate. The method comprises the following steps: one, stacking and sealing; two, metastable heat treatment and rolling; and three, post-rolling heat treatment. The application is used for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate through metastable rolling.

Description

Technical Field

[0001] This invention relates to a method for preparing a three-layer composite plate of high-strength aluminum / Ti2AlNb / high-strength aluminum. Background Technology

[0002] With the development of industries such as aerospace, military, and transportation, the requirements for the performance of metal components are becoming increasingly stringent, and their service environments are becoming more complex and variable. Low density, high strength, high temperature resistance, and low cost are the future development directions, as single metals are no longer sufficient to meet the increasingly demanding comprehensive performance requirements. Metal composite plates combine the properties of multiple metals and are an important way to improve the comprehensive performance of metal materials. Ti2AlNb-based alloys have excellent properties such as high strength, high temperature resistance, and corrosion resistance, and can operate at temperatures exceeding 700℃. They are often used in high-temperature service environments such as the skin of hypersonic aircraft. High-strength aluminum alloys have low density, high strength, and low cost, but their high-temperature strength is relatively poor. Therefore, high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plates, prepared by combining Ti2AlNb-based alloys with high-strength aluminum alloys, combine the characteristics of high temperature resistance, lightweight, and low cost. They have unique advantages in short-term service environments across temperature ranges and are particularly suitable for components such as hypersonic missile skins, where the temperature only exceeds 700℃ for short periods throughout the entire service life. They have important applications in the aerospace field. However, there is a huge difference in processing temperature between Ti2AlNb-based alloys and high-strength aluminum, as well as significant differences in deformation resistance and elongation, which makes the preparation of high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plates extremely difficult. Summary of the Invention

[0003] This invention aims to address the problem that existing technologies struggle to prepare high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plates, and thus provides a method for preparing high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plates through metastable rolling.

[0004] A method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling, comprising the following steps:

[0005] 1. Stacking and sealing:

[0006] The surfaces of the high-strength aluminum alloy sheet and the Ti2AlNb-based alloy sheet to be bonded are polished. Then, the high-strength aluminum alloy sheet, Ti2AlNb-based alloy sheet and high-strength aluminum alloy sheet are stacked in the order of bottom to top. Then, the sheets are sealed to obtain a three-layer stacked plate of high-strength aluminum / Ti2AlNb / high-strength aluminum.

[0007] II. Metastable heat treatment and rolling:

[0008] High-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate was kept at a temperature of 250℃~400℃, and then kept at a temperature of 650℃~800℃. After the holding temperature was increased, the plate was rolled to obtain a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite rolled plate.

[0009] III. Post-rolling heat treatment:

[0010] A method for preparing high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plates by heat treatment, followed by trimming and cleaning, is completed.

[0011] The beneficial effects of this invention are:

[0012] I. This invention employs metastable heat treatment. The first stage of heat treatment involves holding the material at a relatively low temperature for a longer period, increasing the plasticity of both metal plates and shortening the time of the second stage heat treatment to prevent the high-strength aluminum alloy from melting. The second stage of heat treatment involves holding the material at a relatively high temperature for a short period. The processing temperature of Ti2AlNb is above 650℃, while the melting point of the high-strength aluminum alloy is below 650℃. Prolonged heating would cause the high-strength aluminum alloy to melt. However, by holding the material at 650℃ for a short time, the high-strength aluminum alloy is in an intermediate state between unmelted and molten, still retaining a certain degree of processing strength. This treatment method balances the processing strength of both alloys.

[0013] The two- and three-layer composite plates are made of high-strength aluminum / Ti2AlNb / high-strength aluminum. The outer high-strength aluminum alloy is in contact with the cold rolls of the rolling mill, and the processing temperature is low to prevent the high-strength aluminum alloy from melting. Meanwhile, the Ti2AlNb-based alloy in the center cools down slowly, remaining within a higher processable temperature range during rolling, thus increasing its plasticity. All these methods aim to ensure that the Ti2AlNb-based alloy reaches a higher temperature during rolling, reducing processing strength, while simultaneously preventing the high-strength aluminum alloy from melting, thereby achieving the successful rolling preparation of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate.

[0014] III. The high-quality high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate possesses excellent comprehensive performance and can replace the current hypersonic vehicle skin and structural components, achieving multiple functions such as weight reduction and high-temperature resistance. The Ti2AlNb-based alloy exhibits good high-temperature resistance, enabling it to operate in the short-term high-temperature environment of hypersonic vehicles while maintaining structural integrity. In the three-layer composite plate structure prepared by this invention, the less ductile Ti2AlNb-based alloy is encased between two layers of highly ductile high-strength aluminum alloy. When the composite plate deforms, due to the interfacial connection between the two alloys, the highly ductile high-strength aluminum alloy will drive the deformation of the Ti2AlNb-based alloy, increasing its ductility.

[0015] Instruction manual illustrations

[0016] Figure 1 This is a schematic diagram of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared according to the present invention;

[0017] Figure 2 A physical image of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 1;

[0018] Figure 3 The image shows a physical picture of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 2.

[0019] Figure 4 The image shows a physical sample of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 3.

[0020] Figure 5 A photograph of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 4;

[0021] Figure 6 A photograph of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 5;

[0022] Figure 7 The thickness distribution diagram of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 1;

[0023] Figure 8 This is a data measurement diagram of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 1;

[0024] Figure 9 The tensile curves of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 1 after being held at different temperatures for 3 minutes are shown. Detailed Implementation

[0025] Specific implementation method one, combined with Figure 1 Detailed explanation: This embodiment describes a method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling, which is carried out according to the following steps:

[0026] 1. Stacking and sealing:

[0027] The surfaces of the high-strength aluminum alloy sheet and the Ti2AlNb-based alloy sheet to be bonded are polished. Then, the high-strength aluminum alloy sheet, Ti2AlNb-based alloy sheet and high-strength aluminum alloy sheet are stacked in the order of bottom to top. Then, the sheets are sealed to obtain a three-layer stacked plate of high-strength aluminum / Ti2AlNb / high-strength aluminum.

[0028] II. Metastable heat treatment and rolling:

[0029] High-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate was kept at a temperature of 250℃~400℃, and then kept at a temperature of 650℃~800℃. After the holding temperature was increased, the plate was rolled to obtain a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite rolled plate.

[0030] III. Post-rolling heat treatment:

[0031] A method for preparing high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plates by heat treatment, followed by trimming and cleaning, is completed.

[0032] In this specific implementation method, rolling is performed immediately after intermediate steady-state heat treatment in step two.

[0033] The beneficial effects of this embodiment are:

[0034] I. This embodiment employs metastable heat treatment. The first stage of heat treatment involves holding at a relatively low temperature for a longer period, increasing the plasticity of both metal plates and shortening the time of the second stage heat treatment to prevent the high-strength aluminum alloy from melting. The second stage of heat treatment involves holding at a relatively high temperature for a short period. The processing temperature of Ti2AlNb is above 650℃, while the melting point of the high-strength aluminum alloy is below 650℃. Prolonged heating would cause the high-strength aluminum alloy to melt. However, by holding at 650℃ for a short time, the high-strength aluminum alloy is in an intermediate state between unmelted and molten, still retaining a certain degree of processing strength. This treatment method balances the processing strength of both alloys.

[0035] The two- and three-layer composite plates are made of high-strength aluminum / Ti2AlNb / high-strength aluminum. The outer high-strength aluminum alloy is in contact with the cold rolls of the rolling mill, and the processing temperature is low to prevent the high-strength aluminum alloy from melting. Meanwhile, the Ti2AlNb-based alloy in the center cools down slowly, remaining within a higher processable temperature range during rolling, thus increasing its plasticity. All these methods aim to ensure that the Ti2AlNb-based alloy reaches a higher temperature during rolling, reducing processing strength, while simultaneously preventing the high-strength aluminum alloy from melting, thereby achieving the successful rolling preparation of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate.

[0036] III. High-quality high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plates possess excellent comprehensive performance, capable of replacing current hypersonic vehicle skins and structural components, achieving multiple functions such as weight reduction and high-temperature resistance. Ti2AlNb-based alloys exhibit good high-temperature resistance, enabling them to operate in the short-term high-temperature environment of hypersonic vehicles while maintaining structural integrity. In the three-layer composite plate structure prepared in this embodiment, the less ductile Ti2AlNb-based alloy is encased between two layers of highly ductile high-strength aluminum alloy. When the composite plate deforms, due to the interfacial connection between the two alloys, the highly ductile high-strength aluminum alloy will drive the deformation of the Ti2AlNb-based alloy, increasing its ductility.

[0037] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the high-strength aluminum alloy sheet mentioned in step one is a 2-series high-strength aluminum alloy or a 7-series high-strength aluminum alloy. Everything else is the same as in Specific Implementation Method One.

[0038] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in that the Ti2AlNb-based alloy plate mentioned in step one is Ti-22Al-25Nb, Ti-23Al-17Nb, Ti-25Al-24Nb, or Ti-22Al-27Nb. Everything else is the same as in Specific Implementation Method One or Two.

[0039] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the polishing described in step one is performed as follows: High-strength aluminum alloy sheets and Ti2AlNb-based alloy sheets are polished sequentially using 200-grit, 400-grit, and 800-grit sandpaper, followed by cleaning. Everything else is the same as in Specific Implementation Methods One to Three.

[0040] Specific Implementation Method Five: This implementation method differs from Specific Implementation Methods One to Four in that the thickness ratio of the Ti2AlNb-based alloy plate to the single-sided high-strength aluminum alloy plate in the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate described in step one is 1:(0.3~1). Everything else is the same as in Specific Implementation Methods One to Four.

[0041] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that the sealing treatment described in step one involves applying high-temperature sealant or vacuum welding along the side surface gaps. Everything else is the same as in Specific Implementation Methods One to Five.

[0042] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that: in step two, the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate is kept at a temperature of 250℃~400℃ for 15min~20min. Everything else is the same as in Specific Implementation Methods One to Six.

[0043] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Methods One to Seven in that: in step two, the temperature is maintained at 650℃~800℃ for 2 to 5 minutes. Everything else is the same as Specific Implementation Methods One to Seven.

[0044] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods One through Eight in that: in step two, after heat preservation for 30 seconds, rolling is carried out under the conditions of roll temperature ranging from room temperature to 200°C, rolling speed of 0.5 m / min to 5 m / min, and total rolling amount of 30% to 70%. The rolling passes are one or two, resulting in a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite rolled plate. Everything else is the same as in Specific Implementation Methods One through Eight.

[0045] Specific Implementation Method Ten: This implementation method differs from Specific Implementation Methods One to Nine in that the heat treatment described in step three is specifically performed at a temperature of 100℃ to 300℃ on the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite rolled plate for 30 to 60 minutes. Everything else is the same as in Specific Implementation Methods One to Nine.

[0046] The beneficial effects of the present invention are verified using the following embodiments:

[0047] Example 1:

[0048] A method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling, comprising the following steps:

[0049] 1. Stacking and sealing:

[0050] The surfaces of the high-strength aluminum alloy sheet and the Ti2AlNb-based alloy sheet to be bonded are polished. Then, the high-strength aluminum alloy sheet, Ti2AlNb-based alloy sheet and high-strength aluminum alloy sheet are stacked in the order of bottom to top. Then, the sheets are sealed to obtain a three-layer stacked plate of high-strength aluminum / Ti2AlNb / high-strength aluminum.

[0051] The initial thickness of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate is 6mm;

[0052] II. Metastable heat treatment:

[0053] The high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate was held at 300℃ for 15 minutes, and then held at 680℃ for 3 minutes. After holding, it was rolled to obtain the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite rolled plate.

[0054] III. Post-rolling heat treatment:

[0055] A method for preparing high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plates by heat treatment, followed by trimming and cleaning, is completed.

[0056] The high-strength aluminum alloy sheet mentioned in step one is a 7075 high-strength aluminum alloy sheet with a thickness of 2mm.

[0057] The Ti2AlNb-based alloy plate mentioned in step one is Ti-22Al-25Nb with a thickness of 2mm.

[0058] The polishing process described in step one is carried out in the following steps: use 200-grit, 400-grit, and 800-grit sandpaper to polish the high-strength aluminum alloy sheet and the Ti2AlNb-based alloy sheet in sequence, and then clean them with alcohol and acetone.

[0059] The sealing process described in step one involves applying an inorganic aluminosilicate high-temperature sealant with the code DB5012. The specific steps are as follows: 1. Weigh the two components according to a ratio of 1.6g powder to 1mL liquid, mix them thoroughly to form a flowable paste, and obtain the high-temperature adhesive; 2. After stacking, apply the high-temperature adhesive along the gaps on the side surfaces while applying vertical pressure to the stacked surfaces; 3. After application, place the mixture at room temperature for 12 hours, then place it in a heat preservation oven, first heat preservation at 80℃ for 2 hours, and then heat preservation at 150℃ for 2 hours to complete the sealing.

[0060] In step two, after heat preservation for 30 seconds, rolling is carried out under the conditions of room temperature of the rolls, rolling speed of 2m / min and rolling amount of 50%, and the rolling pass is one pass, to obtain a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite rolled plate.

[0061] The heat treatment described in step three specifically involves heat-treating the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite rolled plate at a temperature of 200℃ for 1 hour.

[0062] Example 2: This example differs from Example 1 in that, in step two, the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate is kept at 260℃ for 20 minutes, and then kept at 680℃ for 3 minutes. Everything else is the same as in Example 1.

[0063] Example 3: This example differs from Example 1 in that: in step 2, the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate is held at 300℃ for 15 minutes, and then held at 700℃ for 3 minutes; the rolling amount in step 2 is 16%. Everything else is the same as in Example 1.

[0064] Example 4: This example differs from Example 1 in that: in step 2, the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate is held at 300℃ for 15 minutes, and then held at 700℃ for 3 minutes; the rolling amount in step 2 is 66%. Everything else is the same as in Example 1.

[0065] Example 5: This example differs from Example 1 in that: in step two, the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate is held at 300℃ for 15 minutes, and then held at 700℃ for 3 minutes; in step two, the rolling passes are two, with the first rolling amount being 16% and the second rolling amount being 40%, for a total rolling mass of 56%. Everything else is the same as in Example 1.

[0066] Figure 2 A physical image of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 1; Figure 3 The image shows a physical picture of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 2. Figure 4 The image shows a physical sample of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 3. Figure 5 A photograph of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 4; Figure 6 The image shows a physical photograph of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 5. It can be seen that the Ti2AlNb bonding alloy and the high-strength aluminum alloy deform in a coordinated and uniform manner, the interface between the two metals is well-bonded, and the surface quality of the composite plate is good. Therefore, using the metastable rolling method of this example, high-quality high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plates can be prepared under different rolling qualities and rolling passes.

[0067] Figure 7 This is a thickness distribution diagram of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 1. The thickness was measured at 12 sampling points on the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate using vernier calipers, and the values ​​were recorded. The thickness ranged from 3.38 mm to 3.44 mm, and the thickness distribution was uniform.

[0068] Figure 8This image shows the data measurement of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 1. The high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate was cut into rectangles using wire cutting. Its outer dimensions were measured using calipers: thickness 3.54 mm, width 18.85 mm, length 54.75 mm, and weight 11.43 g. Based on the measurement data, the equivalent density of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate is roughly estimated to be 3.12 g / mm². 3 Compared to the density of Ti2AlNb-based alloys (4.5 g / mm³), 3 The weight reduction exceeds 30%. This demonstrates that the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate can achieve weight reduction in spacecraft.

[0069] The material was subjected to tensile testing in accordance with GB / T 228.2-2015 standard; Figure 9 The tensile curves of the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in Example 1 after holding at different temperatures for 3 minutes are shown. The ultimate stress is 530 MPa at 400℃, 337 MPa at 500℃, 260 MPa at 600℃, and 235 MPa at 650℃. Notably, 650℃ is close to the melting point of the high-strength aluminum alloy, but the plate still retains a certain strength after holding at this temperature for 3 minutes. This demonstrates that the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate prepared in this example can be used in high-temperature service environments, and can even maintain a certain strength for a short period near the melting point of the high-strength aluminum alloy.

Claims

1. A method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling, characterized in that... It is done in the following steps:

1. Stacking and sealing: The surfaces of the high-strength aluminum alloy sheet and the Ti2AlNb-based alloy sheet to be bonded are polished. Then, the high-strength aluminum alloy sheet, Ti2AlNb-based alloy sheet and high-strength aluminum alloy sheet are stacked in the order of bottom to top. Then, the sheets are sealed to obtain a three-layer stacked plate of high-strength aluminum / Ti2AlNb / high-strength aluminum. II. Metastable heat treatment and rolling: The high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate was held at a temperature of 250℃~400℃ for 15min~20min, and then held at a temperature of 650℃~800℃ for 2min~5min. After holding, it was rolled to obtain the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite rolled plate. III. Post-rolling heat treatment: A method for preparing high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plates by heat treatment, followed by trimming and cleaning, is completed.

2. The method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling according to claim 1, characterized in that... The high-strength aluminum alloy sheet mentioned in step one is a 2-series high-strength aluminum alloy or a 7-series high-strength aluminum alloy.

3. The method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling according to claim 1, characterized in that... The Ti2AlNb-based alloy plate mentioned in step one is Ti-22Al-25Nb, Ti-23Al-17Nb, Ti-25Al-24Nb or Ti-22Al-27Nb.

4. The method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling according to claim 1, characterized in that... The polishing process described in step one is carried out in the following steps: use 200-grit, 400-grit, and 800-grit sandpaper to polish the high-strength aluminum alloy sheet and the Ti2AlNb-based alloy sheet in sequence, and then clean them.

5. The method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling according to claim 1, characterized in that... In the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer stacked plate described in step one, the thickness ratio of the Ti2AlNb-based alloy plate to the single-sided high-strength aluminum alloy plate is 1:(0.3~1).

6. The method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling according to claim 1, characterized in that... The sealing process described in step one involves applying high-temperature sealant or vacuum welding along the gaps on the side surface.

7. The method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling according to claim 1, characterized in that... In step two, after heat preservation for 30 seconds, rolling is carried out under the conditions of roll temperature from room temperature to 200℃, rolling speed of 0.5m / min to 5m / min, and total rolling amount of 30% to 70%. The rolling passes are one or two, to obtain a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite rolled plate.

8. The method for preparing a high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite plate by metastable rolling according to claim 1, characterized in that... The heat treatment described in step three specifically involves heat-treating the high-strength aluminum / Ti2AlNb / high-strength aluminum three-layer composite rolled plate at a temperature of 100℃~300℃ for 30min~60min.

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