A method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates through pre-rolling microstructure control
By controlling the microstructure before rolling and performing metastable rolling on Ti2AlNb/high-strength aluminum alloy composite plates, the problem of deformation incoordination during the rolling process was solved, and high-quality composite plate preparation was achieved. Specifically, this included improving the plasticity of the Ti2AlNb-based alloy and matching the strength of the high-strength aluminum alloy, thereby reducing the risk of cracking and misalignment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HARBIN INST OF TECH
- Filing Date
- 2024-01-23
- Publication Date
- 2026-06-26
AI Technical Summary
During the rolling process, the large difference in strength and plasticity between the two metals leads to inconsistent deformation, making it prone to cracking, misalignment, and low bonding strength, thus making it difficult to produce high-quality composite plates.
By controlling the microstructure of Ti2AlNb-based alloy and high-strength aluminum alloy plates before rolling, including heat treatment and solution treatment, combined with sealing treatment, and using a metastable rolling method, the plates are rolled at a specific temperature after control to achieve synergistic deformation of the two metals.
The plasticity of Ti2AlNb-based alloys and the strength matching of high-strength aluminum alloys were improved, defects in composite plates were reduced, thickness uniformity and bonding strength were ensured, and high-quality composite plate forming was achieved.
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Figure CN117862246B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates. Background Technology
[0002] With the rapid development of industries such as aerospace and military, the requirements for the performance of metallic materials are also increasing. Facing complex and harsh service environments, materials must meet multiple requirements, including high strength, high temperature resistance, and lightweight, which is extremely difficult for single-metal materials. Therefore, multilayer composite plates are becoming increasingly popular. Ti2AlNb-based alloys possess high strength, high stiffness, and heat resistance, while high-strength aluminum alloys are lightweight. Ti2AlNb / high-strength aluminum alloy double-layer composite plates can meet the service requirements of complex environments. However, rolling composites of Ti2AlNb-based alloys and high-strength aluminum alloys is difficult. Due to the large differences in strength and plasticity, as well as the significant differences in temperature sensitivity between the two finished plates, uneven deformation of the two materials during rolling can easily occur, leading to cracking, misalignment, and low bonding strength, greatly limiting the preparation of Ti2AlNb / high-strength aluminum alloy composite plates. Summary of the Invention
[0003] This invention aims to address the problems of inconsistent deformation, cracking, misalignment, and low bonding strength in existing Ti2AlNb / high-strength aluminum alloy composite plates during rolling due to the significant differences in properties between the two metals. The invention provides a method to improve the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates through pre-rolling microstructure control.
[0004] A method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, comprising the following steps:
[0005] I. Microstructure control before rolling Ti2AlNb-based alloy plates:
[0006] Ti2AlNb-based alloy plates were held at 960℃~1040℃ for 15min~60min and then water-quenched to obtain Ti2AlNb-based alloy plates that had undergone pre-rolling heat treatment.
[0007] II. Microstructure Control Before Rolling of High-Strength Aluminum Alloy Sheets:
[0008] High-strength aluminum alloy sheets are subjected to solution treatment and aging treatment in sequence to obtain high-strength aluminum alloy sheets with high yield strength structure.
[0009] III. Sheet metal processing and sealing:
[0010] The surfaces to be joined by the heat-treated Ti2AlNb-based alloy sheet and the high-strength aluminum alloy sheet with high yield strength structure are ground and cleaned. Then, they are stacked in the order of Ti2AlNb / high-strength aluminum alloy or high-strength aluminum alloy / Ti2AlNb / high-strength aluminum alloy, and finally sealed to obtain the sealed stacked parts.
[0011] IV. Rolling of Metastable Composite Plates:
[0012] The sealed stacked parts are kept at a temperature below the melting point of the high-strength aluminum alloy for a long time, and then kept at a temperature above the melting point of the aluminum alloy for a short time. After the holding time, they are rolled within 30 seconds, and finally heat treated. This completes the method of improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plate by controlling the microstructure before rolling.
[0013] The beneficial effects of this invention are:
[0014] This invention utilizes the characteristic that both Ti2AlNb-based alloys and high-strength aluminum alloys have a significant impact on their properties due to their microstructure. Before rolling heating, the microstructure of the two types of plates is controlled to reduce the differences in mechanical properties such as deformation resistance and elongation between the two metals, thereby improving their synergistic deformation ability. A metastable rolling method is then used to achieve high-quality forming of both types of plates, as detailed below:
[0015] I. The microstructure of rolled Ti2AlNb-based alloy billets is generally O-phase, exhibiting high strength but poor plasticity. This makes it difficult to match the strength of the alloy with that of the aluminum alloy during composite plate rolling, easily leading to breakage. This invention, however, achieves a B2+O+α2 three-phase or B2+α2 two-phase microstructure through pre-regulation of the Ti2AlNb-based alloy. This significantly improves the plasticity and deformation capacity of the Ti2AlNb-based alloy, enabling it to match the deformation capacity of high-strength aluminum alloys, thus facilitating the preparation of Ti2AlNb / high-strength aluminum alloy composite plates.
[0016] II. This invention pre-regulates the microstructure of high-strength aluminum alloy billets through pre-rolling heat treatment, resulting in a microstructure with the highest strength and elongation significantly higher than that of Ti2AlNb-based alloys, thus achieving compatibility with Ti2AlNb-based alloys. Through composite plate rolling experiments and analysis, it was found that the regulated Ti2AlNb-based alloy exhibits excellent rolling compatibility with the high-strength aluminum alloy during rolling. Compared to composite plates without pre-rolling regulation, the regulated composite plates show no defects such as breakage or localized thinning, and possess uniform thickness.
[0017] Instruction manual illustrations
[0018] Figure 1 The microstructure of the Ti2AlNb-based alloy sheet after heat treatment before rolling in Example 1;
[0019] Figure 2The image shows the actual Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared in Example 1.
[0020] Figure 3 The microstructure of the Ti2AlNb-based alloy sheet after heat treatment before rolling in step one of Example 2;
[0021] Figure 4 The image shows the actual Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared in Example 2.
[0022] Figure 5 A physical image of the Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared for comparison experiment 1;
[0023] Figure 6 A physical image of the Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared for comparison experiment 2;
[0024] Figure 7 The room temperature tensile curves of the Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared in Example 1, the Ti2AlNb-based alloy plate prepared in step 1 of Example 1 after pre-rolling heat treatment, and the high-strength aluminum alloy plate with high yield strength microstructure prepared in step 2 of Example 1 are shown.
[0025] Figure 8 The image shows a comparison of the Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared in Example 1 before and after room temperature tensile testing. Detailed Implementation
[0026] Specific Implementation Method 1: This implementation method is a method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates through pre-rolling microstructure control, which is carried out according to the following steps:
[0027] I. Microstructure control before rolling Ti2AlNb-based alloy plates:
[0028] Ti2AlNb-based alloy plates were held at 960℃~1040℃ for 15min~60min and then water-quenched to obtain Ti2AlNb-based alloy plates that had undergone pre-rolling heat treatment.
[0029] II. Microstructure Control Before Rolling of High-Strength Aluminum Alloy Sheets:
[0030] High-strength aluminum alloy sheets are subjected to solution treatment and aging treatment in sequence to obtain high-strength aluminum alloy sheets with high yield strength structure.
[0031] III. Sheet metal processing and sealing:
[0032] The surfaces to be joined by the heat-treated Ti2AlNb-based alloy sheet and the high-strength aluminum alloy sheet with high yield strength structure are ground and cleaned. Then, they are stacked in the order of Ti2AlNb / high-strength aluminum alloy or high-strength aluminum alloy / Ti2AlNb / high-strength aluminum alloy, and finally sealed to obtain the sealed stacked parts.
[0033] IV. Rolling of Metastable Composite Plates:
[0034] The sealed stacked parts are kept at a temperature below the melting point of the high-strength aluminum alloy for a long time, and then kept at a temperature above the melting point of the aluminum alloy for a short time. After the holding time, they are rolled within 30 seconds, and finally heat treated. This completes the method of improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plate by controlling the microstructure before rolling.
[0035] The beneficial effects of this embodiment are:
[0036] This embodiment utilizes the characteristic that both Ti2AlNb-based alloys and high-strength aluminum alloys have a significant impact on performance due to their microstructure. Before rolling heating, the microstructure of the two types of plates is controlled to reduce the differences in mechanical properties such as deformation resistance and elongation between the two metals, thereby improving their synergistic deformation ability. High-quality forming of both types of plates is then achieved using a metastable rolling method, as detailed below:
[0037] I. The microstructure of rolled Ti2AlNb-based alloy billets is generally O-phase, exhibiting high strength but poor plasticity. This makes it difficult to match the strength of the alloy with that of the aluminum alloy during composite plate rolling, easily leading to breakage. This embodiment, however, achieves a B2+O+α2 three-phase or B2+α2 two-phase microstructure through pre-regulation of the Ti2AlNb-based alloy. This significantly improves the plasticity and deformation capacity of the Ti2AlNb-based alloy, enabling it to match the deformation capacity of the high-strength aluminum alloy and facilitating the preparation of Ti2AlNb / high-strength aluminum alloy composite plates.
[0038] II. This embodiment pre-regulates the microstructure of high-strength aluminum alloy billets through pre-rolling heat treatment, resulting in a microstructure with the highest strength and elongation significantly higher than that of Ti2AlNb-based alloys, thus achieving compatibility with Ti2AlNb-based alloys. Through composite plate rolling experiments and analysis, it was found that the regulated Ti2AlNb-based alloy exhibits excellent rolling compatibility with the high-strength aluminum alloy during rolling. Compared to composite plates without pre-rolling regulation, the regulated composite plates show no defects such as breakage or localized thinning, and possess uniform thickness.
[0039] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One 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.
[0040] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in that the microstructure of the Ti2AlNb-based alloy sheet subjected to pre-rolling heat treatment in Step One is a three-phase microstructure of B2+O+α2 or a two-phase microstructure of B2+α2. Everything else is the same as in Specific Implementation Method One or Two.
[0041] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that: when the microstructure of the Ti2AlNb-based alloy sheet undergoing pre-rolling heat treatment in Step One is a three-phase structure of B2+O+α2, the Ti2AlNb-based alloy sheet is held at a temperature of 930℃~960℃ for 10min~30min in Step One. Everything else is the same as in Specific Implementation Methods One to Three.
[0042] Specific Implementation Method Five: This implementation method differs from Specific Implementation Methods One to Four in that: when the microstructure of the Ti2AlNb-based alloy sheet undergoing pre-rolling heat treatment in Step One is a B2+α2 dual-phase microstructure, the Ti2AlNb-based alloy sheet is held at a temperature of 1020℃~1030℃ for 10min~15min in Step One. Everything else is the same as in Specific Implementation Methods One to Four.
[0043] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five 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 Methods One to Five.
[0044] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that: the solution treatment in step two is specifically carried out at a temperature of 450℃~520℃ for 20min~60min; the aging treatment in step two is specifically carried out at a temperature of 120℃~150℃ for 12h~30h. Everything else is the same as in Specific Implementation Methods One to Six.
[0045] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Methods One to Seven in that the sealing treatment described in step three 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 Seven.
[0046] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods One to Eight in that: in step four, the sealed stacked components are kept at a temperature of 250℃~300℃ for 15min~20min, and then kept at a temperature of 650℃~800℃ for 2min~5min. Everything else is the same as in Specific Implementation Methods One to Eight.
[0047] Specific Implementation Method Ten: This implementation method differs from Specific Implementation Methods One to Nine in that: the rolling process in step four specifically involves a roll temperature of room temperature, 1 to 4 rolling passes, a rolling speed of 0.5 m / min to 5 m / min, and a total reduction of 30% to 70%; the heat treatment in step four specifically involves treatment at a temperature of 100℃ to 200℃ for 30 to 60 minutes. Everything else is the same as in Specific Implementation Methods One to Nine.
[0048] The beneficial effects of the present invention are verified using the following embodiments:
[0049] Example 1:
[0050] A method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, comprising the following steps:
[0051] I. Microstructure control before rolling Ti2AlNb-based alloy plates:
[0052] Ti2AlNb-based alloy sheet was held at 1020℃ for 15 minutes and then water quenched to obtain Ti2AlNb-based alloy sheet under heat treatment before rolling.
[0053] II. Microstructure Control Before Rolling of High-Strength Aluminum Alloy Sheets:
[0054] High-strength aluminum alloy sheets are subjected to solution treatment and aging treatment in sequence to obtain high-strength aluminum alloy sheets with high yield strength structure.
[0055] III. Sheet metal processing and sealing:
[0056] The surfaces to be joined by the heat-treated Ti2AlNb-based alloy sheet and the high-strength aluminum alloy sheet with high yield strength structure are polished and cleaned with alcohol and acetone. Then, they are stacked in the order of high-strength aluminum alloy / Ti2AlNb / high-strength aluminum alloy and finally sealed to obtain the sealed stacked parts.
[0057] IV. Rolling of Metastable Composite Plates:
[0058] The sealed stacked parts were kept at 300℃ for 20 minutes, then at 680℃ for 3 minutes. After the holding time, they were rolled within 30 seconds and finally heat-treated to obtain a Ti2AlNb / high-strength aluminum alloy three-layer composite plate. This completed the method of improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plate by controlling the microstructure before rolling.
[0059] The Ti2AlNb-based alloy plate mentioned in step one is Ti-22Al-25Nb with a thickness of 1mm.
[0060] The microstructure of the Ti2AlNb-based alloy sheet subjected to pre-rolling heat treatment described in step one is a B2+α2 dual-phase microstructure.
[0061] The high-strength aluminum alloy sheet mentioned in step one is 7075 high-strength aluminum alloy with a thickness of 2mm.
[0062] The solution treatment described in step two is specifically held at a temperature of 470℃ for 60 minutes; the aging treatment described in step two is specifically held at a temperature of 120℃ for 24 hours.
[0063] The sealing process described in step three 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.
[0064] The rolling process described in step four specifically involves a roll temperature of room temperature, one rolling pass, a rolling speed of 2 m / min, and a reduction of 50%. The heat treatment described in step four specifically involves a treatment at a temperature of 200°C for 1 hour.
[0065] Example 2: This example differs from Example 1 in that: in step 1, the Ti2AlNb-based alloy sheet is held at 960℃ for 30 minutes; the microstructure of the Ti2AlNb-based alloy sheet subjected to pre-rolling heat treatment in step 1 is a three-phase structure of B2+O+α2. Everything else is the same as in Example 1.
[0066] Comparative Experiment 1: This comparative experiment differs from Example 1 in that the Ti2AlNb-based alloy in step one does not undergo heat treatment and retains its original rolled microstructure. Everything else is the same as in Example 1.
[0067] Comparative Experiment 2: This comparative experiment differs from Example 1 in that: in step one, the Ti2AlNb-based alloy plate was held at 960℃ for 30 minutes, and then held at 750℃ for 60 minutes. Everything else was the same as in Example 1.
[0068] Figure 1 This is the microstructure of the Ti2AlNb-based alloy sheet after heat treatment before rolling in Example 1. The bulk matrix is the B2 phase, and the smaller phase near the grain boundaries is the α2 phase, demonstrating that holding the Ti2AlNb-based alloy sheet at 1020℃ for 15 min can yield a B2+α2 dual-phase microstructure.
[0069] Figure 2 The image shows a physical picture of the Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared in Example 1. It can be seen that the plasticity of the Ti2AlNb-based alloy is greatly increased after pretreatment, and no cracking occurs during the rolling process.
[0070] Figure 3 This is the microstructure of the Ti2AlNb-based alloy sheet after heat treatment before rolling in Step 1 of Example 2. The matrix is the B2 phase, the larger blocky phase is the O phase, and the smaller, less distributed phase is the α2 phase. This demonstrates that holding the Ti2AlNb-based alloy sheet at 960℃ for 30 min can yield a three-phase microstructure of B2+O+α2.
[0071] Figure 4 The image shows the actual Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared in Example 2. It can be seen that after the Ti2AlNb-based alloy is held at 960℃ for 30 minutes, it has good plasticity and its deformation is coordinated with that of the high-strength aluminum alloy during the rolling process of the composite plate, without cracking.
[0072] Figure 5 The image shows a physical sample of the Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared in Experiment 1 for comparison. It can be seen that the Ti2AlNb-based alloy is only bonded to one side of the high-strength aluminum alloy, while the other side has detached. Cracks appeared on the Ti2AlNb-based alloy layer, proving that a Ti2AlNb / high-strength aluminum alloy three-layer composite plate cannot be prepared without microstructure control of the Ti2AlNb-based alloy.
[0073] Figure 6 The image shows a physical sample of the Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared for comparison experiment two. It can be seen that the Ti2AlNb-based alloy layer exhibits numerous fractures, failing to form a continuous structure, and the thickness of the Ti2AlNb-based alloy layer is uneven. Under stress, the fracture points of the Ti2AlNb-based alloy layer are mechanically weak areas, rendering the Ti2AlNb / high-strength aluminum alloy three-layer composite plate unusable.
[0074] Tested according to GB / T 228.1-2021 standard; Figure 7The figures show the room temperature tensile curves of the Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared in Example 1, the Ti2AlNb-based alloy plate prepared in step one of Example 1 after pre-rolling heat treatment, and the high-strength aluminum alloy plate with high yield strength microstructure prepared in step two of Example 1. After pre-regulation of Ti2AlNb in this example, the maximum room temperature tensile stress of the prepared Ti2AlNb / high-strength aluminum alloy three-layer composite plate is 654 MPa, and the maximum strain is 0.16 MPa. Comparison shows that the maximum stress and maximum strain of the Ti2AlNb / high-strength aluminum alloy three-layer composite plate are both greater than those of the high-strength aluminum alloy plate with high yield strength microstructure (T6 state), and the maximum strain is greater than that of the Ti2AlNb-based alloy plate after pre-rolling heat treatment.
[0075] Figure 8 The image shows a comparison of the Ti2AlNb / high-strength aluminum alloy three-layer composite plate prepared in Example 1 before and after room temperature tensile testing. It can be seen that the three metal layers did not separate after stretching, demonstrating strong intermetallic bonding.
Claims
1. A method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, characterized in that... It is done in the following steps: I. Microstructure control before rolling Ti2AlNb-based alloy plates: Ti2AlNb-based alloy plates were held at 960℃~1020℃ for 15min~30min and then water-quenched to obtain Ti2AlNb-based alloy plates that had undergone pre-rolling heat treatment. The microstructure of the Ti2AlNb-based alloy sheet subjected to pre-rolling heat treatment is a three-phase structure of B2+O+α2 or a two-phase structure of B2+α2; II. Microstructure Control Before Rolling of High-Strength Aluminum Alloy Sheets: High-strength aluminum alloy sheets are subjected to solution treatment and aging treatment in sequence to obtain high-strength aluminum alloy sheets with high yield strength structure. III. Sheet metal processing and sealing: The surfaces to be joined by the heat-treated Ti2AlNb-based alloy sheet and the high-strength aluminum alloy sheet with high yield strength structure are ground and cleaned. Then, they are stacked in the order of Ti2AlNb / high-strength aluminum alloy or high-strength aluminum alloy / Ti2AlNb / high-strength aluminum alloy, and finally sealed to obtain the sealed stacked parts. IV. Rolling of Metastable Composite Plates: The sealed stacked parts are kept at a temperature below the melting point of the high-strength aluminum alloy for a long time, and then kept at a temperature above the melting point of the aluminum alloy for a short time. After the holding time, they are rolled within 30 seconds, and finally heat treated. This completes the method of improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plate by controlling the microstructure before rolling.
2. The method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, as described in claim 1, is 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.
3. The method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, as described in claim 1, is characterized in that... When the microstructure of the Ti2AlNb-based alloy plate undergoing pre-rolling heat treatment in step one is a three-phase structure of B2+O+α2, the Ti2AlNb-based alloy plate is held at a temperature of 960℃ for 30 minutes in step one.
4. The method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, as described in claim 1, is characterized in that... When the microstructure of the Ti2AlNb-based alloy plate undergoing pre-rolling heat treatment in step one is a B2+α2 dual-phase microstructure, the Ti2AlNb-based alloy plate is held at 1020℃ for 15 minutes in step one.
5. The method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, as described in claim 1, is characterized in that... The high-strength aluminum alloy sheet mentioned in step two is a 2-series high-strength aluminum alloy or a 7-series high-strength aluminum alloy.
6. The method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, as described in claim 1, is characterized in that... The solution treatment described in step two is specifically performed at a temperature of 450℃~520℃ for 20min~60min; the aging treatment described in step two is specifically performed at a temperature of 120℃~150℃ for 12h~30h.
7. A method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, as described in claim 1, is characterized in that... The sealing process described in step three involves applying high-temperature sealant or vacuum welding along the gaps on the side surfaces.
8. The method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, as described in claim 1, is characterized in that... In step four, the sealed stacked parts are kept at a temperature of 250℃~300℃ for 15min~20min, and then kept at a temperature of 650℃~800℃ for 2min~5min.
9. A method for improving the rolling quality of Ti2AlNb / high-strength aluminum alloy composite plates by controlling the microstructure before rolling, as described in claim 1, characterized in that... The rolling process described in step four specifically involves a roll temperature of room temperature, 1 to 4 rolling passes, a rolling speed of 0.5 m / min to 5 m / min, and a total reduction of 30% to 70%. The heat treatment described in step four specifically involves a treatment at a temperature of 100℃ to 200℃ for 30 to 60 minutes.