TiAl / TC4 alloy composite plate and short-process preparation method thereof

Abstract

The invention provides a TiAl / TC4 alloy composite plate and a short-process preparation method thereof. The preparation method uses TiAl3 powder, pure Ti powder and TC4 powder as raw materials, firstly uniformly mixes TiAl3 powder and pure Ti powder according to a powder ratio to obtain Ti-Al powder; the Ti-Al powder and TC4 powder are alternately loaded into a sheath in sequence to form a layered powder blank in which Ti-Al powder layers and TC4 powder layers are alternately superimposed on each other; then, the sheath is directly hot-rolled through powder packaging, so as to shorten the process flow, significantly reduce energy consumption, reduce production costs, and reduce the risk of blank exposure and contamination, and can also significantly improve the interface bonding force between the Ti-Al powder layer and the TC4 powder layer, so as to obtain a TiAl / TC4 alloy composite plate with fine grains and excellent performance.

Description

Technical Field

[0001] The invention relates to the technical field of titanium-aluminum alloy powder metallurgy, and in particular to a TiAl / TC4 alloy composite plate and a short-process preparation method thereof. Background Art

[0002] Nowadays, with the rapid development of domestic aerospace, national defense and other industries, especially the requirements of aerospace vehicles and military aircraft engines with a large thrust ratio, the selection of materials has been rapidly developed in the direction of high performance, high specific strength and light weight. Titanium aluminum alloy has low density, high specific strength, and can still maintain excellent oxidation resistance and creep resistance at high temperatures. Its elastic modulus, creep resistance and other properties are comparable to nickel-based high-temperature alloys currently used in aerospace engines. The density of titanium aluminum alloy is only half of that of nickel-based high-temperature alloys or even lower, and it has received widespread attention in the field of lightweight heat-resistant structural parts.

[0003] The process of preparing plates by traditional ingot metallurgical rolling is mature and has excellent performance, but the process is complex and the cost is high. The titanium-aluminum composite plates prepared from foil have problems such as poor interface bonding and high impurity content.

[0004] Therefore, it is very necessary to develop a short-process preparation method that can significantly reduce costs and achieve the effect of improving alloy density and refining grain structure to a certain extent. Summary of the invention

[0005] In order to overcome the deficiencies in the prior art, the main purpose of the present invention is to provide a TiAl / TC4 alloy composite plate and a short-process preparation method thereof. The preparation method of directly performing sheath hot rolling through powder encapsulation can shorten the process flow of preparing titanium-aluminum alloy plates, significantly reduce energy consumption, reduce production costs, and reduce the risk of exposed billets being contaminated. Moreover, the preparation method can also significantly improve the interfacial bonding strength between the Ti-Al powder layer and the TC4 powder layer, thereby obtaining a TiAl / TC4 alloy composite plate with fine grains and excellent performance.

[0006] In order to achieve the above object, according to a first aspect of the present invention, a short-process preparation method for a TiAl / TC4 alloy composite plate is provided.

[0007] The short-process preparation method of the TiAl / TC4 alloy composite plate comprises the following steps:

[0008] Using TiAl3 powder, pure Ti powder and TC4 powder as raw materials, and uniformly mixing the TiAl3 powder and the pure Ti powder according to a powder ratio to obtain Ti-Al powder;

[0009] The Ti-Al powder and the TC4 powder are alternately loaded into the package in sequence, and are respectively filled to a certain thickness to form a layered powder blank in which Ti-Al powder layers and TC4 powder layers are alternately stacked on each other, and the bottom layer and the top layer of the powder blank are both Ti-Al powder layers;

[0010] The sheath is sealed and welded, and then the sealed and welded sheath and the powder blank are rolled for multiple times to obtain a TiAl / TC4 alloy composite sheet.

[0011] Furthermore, the rolling process includes: heating to 1200-1350°C, keeping the temperature for 10-20 minutes, and then rolling the powder blank, with the total deformation of multiple rolling passes being 60-80%; wherein the final rolling temperature of each pass is controlled to be ≥1200°C, and after each rolling pass, the powder blank is returned to the furnace for 5-10 minutes to average the temperature before the next rolling pass;

[0012] Preferably, the powder blank is rolled using an induction coil heating furnace.

[0013] Furthermore, during the rolling process, when the total deformation of the powder blank is ≤30%, the linear speed of the roller is 20-40 mm / s, and the deformation per pass is 30-40%;

[0014] When the total deformation of the powder blank is 30-80%, the linear speed of the roller is 100-120 mm / s, and the deformation per pass is 15-25%.

[0015] Furthermore, the number of layers of the powder blank is 2N+1 layers, wherein N is an integer of 1-50.

[0016] Furthermore, the thickness of each Ti-Al powder layer is 1 to 10 mm, and the thickness of each TC4 powder layer is 1 to 10 mm;

[0017] Preferably, the thickness of each Ti—Al powder layer is 2 to 4 mm, and the thickness of each TC4 powder layer is 2 to 4 mm.

[0018] Furthermore, the Ti-Al powder and the TC4 powder are alternately loaded into the package in sequence by a vibration method and fully vibrated and filled to obtain the powder blank.

[0019] Furthermore, in the Ti-Al powder, the percentage of Al atoms in the total number of all atoms is 40-50%.

[0020] Furthermore, the average particle size of the TiAl3 powder is 40-60 μm, and the oxygen content is 400-600 ppm;

[0021] The average particle size of the pure Ti powder is 40-60 μm, and the oxygen content is 600-800 ppm;

[0022] The average particle size of the TC4 powder is 40-60 μm, and the oxygen content is 600-800 ppm.

[0023] In order to achieve the above objective, according to a second aspect of the present invention, a TiAl / TC4 alloy composite plate material is provided.

[0024] The TiAl / TC4 alloy laminated composite plate material is prepared by the above-mentioned preparation method, wherein the organizational structure of the TiAl / TC4 alloy laminated composite plate material comprises Ti-Al alloy layers and TC4 alloy layers stacked in sequence, and both the bottom layer and the top layer are Ti-Al alloy layers; and there is a "serrated" connection interface between the Ti-Al alloy layer and the TC4 alloy layer;

[0025] Wherein, the Ti—Al alloy layer is formed by doping Ti3Al phase and TiAl phase.

[0026] Furthermore, the room temperature tensile strength of the TiAl / TC4 alloy laminated composite plate is ≥980MPA, the room temperature plasticity is 4-5%, the 700°C tensile strength is 760MPA, and the 700°C plasticity is 8-9%;

[0027] Preferably, the thickness of the TiAl / TC4 alloy laminated composite plate is 1.4-1.6 mm.

[0028] Beneficial effects of the present invention:

[0029] The present invention adopts a powder metallurgy method, adopts low-oxygen TiAl3 powder, pure Ti powder and TC4 alloy powder, directly avoiding the problem of metallurgical structure segregation of ingots and easy contamination during the processing of single powders and foils, and also avoids the problem of difficult control of the interface bonding quality of different foils caused by stacking foils, thereby significantly improving the bonding strength of the interfaces of different components of the titanium-aluminum composite plate and reducing the impurity content of the interface.

[0030] The present invention adopts a powder metallurgy method to alternately stack Ti-Al powder and TC4 powder obtained by powder ratio, so that the TC4 powder layer is used as a toughening layer of the TiAl / TC4 alloy composite plate, and the loading energy is absorbed by the TC4 powder layer, thereby improving the fracture toughness of the TiAl / TC4 alloy composite plate.

[0031] The method of directly performing jacket hot rolling through powder encapsulation in the present invention can shorten the process flow of preparing titanium-aluminum alloy plates, reduce the risk of billet exposure and contamination, and can also significantly improve the interface bonding strength between the Ti-Al powder layer and the TC4 powder layer; at the same time, powder rolling has a lower rheological stress, and subsequently a hot rolling process with multiple passes, different rates, and different pressing amounts is performed according to the deformation amount of the billet, and finally the jacket is removed after furnace cooling to obtain a TiAl / TC4 alloy composite plate with fine grains and excellent performance.

[0032] The method of the present invention has low processing difficulty, short rolling cycle, high production efficiency, clear process flow, low requirements on rolling equipment, and is suitable for large-scale production.

[0033] The TiAl / TC4 alloy composite plate prepared by the present invention has obvious lamination structural characteristics, and the interface is tightly bonded in a "serrated" shape, thereby improving the comprehensive mechanical properties of the composite plate, overcoming the problems of existing titanium aluminum plates such as high brittleness, easy cracking, poor interface bonding between different components, high impurity content, and complex preparation process and high cost. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present disclosure will be described in more detail below. It should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] In view of some shortcomings in traditional processing, the method of directly performing jacket hot rolling through powder encapsulation in the present invention can significantly reduce energy consumption and production costs compared to isothermal forging, hot extrusion and other hot processing methods. At the same time, the powder hot rolling process is applied to the forming of titanium-aluminum alloy powder, which not only reduces the processing cost of preparing titanium-aluminum alloy plates, but also can achieve the effect of improving the alloy density and refining the grain structure to a certain extent. This plays an extremely important role in promoting the widespread application of titanium-aluminum alloy plates in the industrial field.

[0036] According to a specific embodiment of the present invention, a short-process preparation method for a TiAl / TC4 alloy composite plate is provided.

[0037] The preparation method of the present invention comprises the following steps:

[0038] 1) Using TiAl3 powder, pure Ti powder and TC4 powder as raw materials, firstly, the TiAl3 powder and the pure Ti powder are uniformly mixed according to a preset powder ratio to obtain Ti-Al powder. Among them, in the Ti-Al powder, the percentage of Al atoms in the total number of all atoms is 40-50%, for example, Ti-(46-48)Al powder is obtained according to the powder ratio.

[0039] In the embodiment of the present invention, the average particle size of the TiAl3 powder is 40-60 μm, and the oxygen content is 400-600 ppm.

[0040] In the embodiment of the present invention, the average particle size of the pure Ti powder is 40-60 μm, and the oxygen content is 600-800 ppm.

[0041] In the embodiment of the present invention, the average particle size of TC4 powder is 40-60 μm, and the oxygen content is 600-800 ppm.

[0042] 2) Ti-Al powder is first loaded into the package by vibration method, and fully vibrated to a certain thickness to form a Ti-Al powder layer; then TC4 powder is loaded into the package, and fully vibrated to a certain thickness to form a TC4 powder layer; the steps are performed alternately to obtain a layered powder blank in which Ti-Al powder layers and TC4 powder layers are alternately superimposed on each other, and the bottom layer and the top layer of the powder blank are both Ti-Al powder layers.

[0043] In an embodiment of the present invention, the number of layers of the powder blank is 2N+1 layers, wherein N is an integer of 1-50.

[0044] In the embodiment of the present invention, the thickness of each Ti-Al powder layer is 1-10 mm.

[0045] As an implementation mode of the present invention, the thickness of each Ti-Al powder layer is 2-4 mm.

[0046] In the embodiment of the present invention, the thickness of each TC4 powder layer is 1-10 mm.

[0047] As an embodiment of the present invention, the thickness of each TC4 powder layer is 2 to 4 mm.

[0048] It is worth mentioning that when the powder blank reaches the predetermined thickness, the sheath is sealed and welded. The sheath material is selected from stainless steel, pure titanium or titanium alloy. The sheath shape can be square. At this time, the exhaust hole is located at the minimum cross-section of the square sheath. Vacuum exhaust treatment is performed and finally the exhaust hole is sealed and welded.

[0049] It should be noted that before loading the powder, the package is firstly cleaned by ultrasonic cleaning and alcohol scrubbing to remove oil and dust impurities on the surface, and then blown dry with hot air.

[0050] 3) The sealed and welded package and powder blank are subjected to multiple rolling processes to obtain a TiAl / TC4 alloy composite plate.

[0051] The rolling process includes: placing the sealed and welded sheath into an induction coil heating furnace, heating it to 1200-1350°C with the furnace, and directly hot-rolling the sheath after keeping it warm for 10-20 minutes, so that the pure Ti powder and the low-oxygen TiAl3 powder undergo a certain degree of diffusion reaction to generate TiAl alloy, and achieve a compact effect with the TC4 powder; the total deformation of multiple rolling passes is 60-80%; wherein, the final rolling temperature of each pass is controlled to be ≥1200°C, and after each rolling pass, the sheath is returned to the furnace for 5-10 minutes to average the temperature before the next rolling pass; the powder rolling has a lower rheological stress, and after multiple hot rolling passes, the sheath is cooled with the furnace, and finally the sheath is removed to obtain a fine-grained and dense TiAl / TC4 alloy composite plate.

[0052] During the rolling process, when the total deformation of the powder billet is ≤30%, the roller linear speed is 20-40 mm / s, and the deformation per pass is 30-40%;

[0053] When the total deformation of the powder blank is 30-80%, the linear speed of the roller is 100-120 mm / s, and the deformation per pass is 15-25%.

[0054] According to a specific embodiment of the present invention, a TiAl / TC4 alloy laminated composite plate material is also provided, and the TiAl / TC4 alloy laminated composite plate material is prepared by the above-mentioned preparation method.

[0055] The organizational structure of the TiAl / TC4 alloy laminated composite plate in the present invention comprises Ti-Al alloy layers and TC4 alloy layers stacked in sequence, and both the bottom layer and the top layer are Ti-Al alloy layers; there is a "serrated" connection interface between the Ti-Al alloy layer and the TC4 alloy layer;

[0056] Wherein, the Ti—Al alloy layer is formed by doping Ti3Al phase and TiAl phase.

[0057] In the present invention, the main components of the composite layer of the laminated structure composite plate are TC4 phase, Ti3Al phase and TiAl phase, wherein the Ti3Al phase and the TiAl phase are doped to form a Ti-Al alloy layer; the TC4 phase forms a TC4 alloy layer, the laminated structure has obvious characteristics, and the interface is tightly combined in a "serrated" shape, the interface bonding is good, the interface bonding force is improved, and the comprehensive mechanical properties of the composite plate are improved.

[0058] The TiAl / TC4 alloy laminated composite plate and its short-process preparation method in the present invention will be described in detail below through specific embodiments.

[0059] Embodiment 1:

[0060] S1. Powder selection:

[0061] The average particle size of TiAl3 powder is 40μm, and the oxygen content is 400-600ppm; the average particle size of pure Ti powder is 40μm, and the oxygen content is 600-800ppm; the average particle size of TC4 powder is 40μm, and the oxygen content is 600-800ppm;

[0062] S2, Square packaging powder and vacuum extraction:

[0063] TiAl3 powder and pure Ti powder are proportioned and uniformly mixed according to Ti-46Al powder, and are loaded into a square sleeve by a vibration method, and are fully vibrated and filled to form a Ti-46Al powder layer with a thickness of 2 mm; TC4 powder is then loaded into the sleeve, and is fully vibrated and filled to form a TC4 powder layer with a thickness of 2 mm; Ti-46Al powder layers and TC4 powder layers are alternately stacked to finally obtain a 31-layer powder blank, and the bottom layer and top layer of the powder blank are both Ti-46Al powder layers; when the powder blank reaches a predetermined thickness, the sleeve is sealed and welded, and the exhaust hole is located at the minimum cross-section of the square sleeve, and vacuum exhaust treatment is performed, and finally the exhaust hole is sealed and welded;

[0064] S3, hot rolling with jacket:

[0065] The sealed and welded sheath is placed in an induction coil heating furnace, heated to 1200°C and kept warm for 10 minutes, and then rolled directly. The total deformation of multiple rolling passes is 80%, and the final rolling temperature of each pass is controlled to be ≥1200°C. After each rolling pass, the next rolling pass is carried out after returning to the furnace for 6 minutes to average the temperature. When the total deformation of the billet to be rolled is ≤30%, the linear speed of the roll is 20mm / s, and the deformation of the pass is 40%; when the total deformation of the billet to be rolled is 30-80%, the linear speed of the roll is 120mm / s, and the deformation of the pass is 25%; finally, the sheath is removed after cooling in the furnace to obtain a TiAl / TC4 alloy composite plate with fine grains, excellent performance and a plate size of 190*60*1.4mm.

[0066] Embodiment 2:

[0067] S1. Powder selection:

[0068] The average particle size of TiAl3 powder is 50μm, and the oxygen content is 400-600ppm; the average particle size of pure Ti powder is 50μm, and the oxygen content is 600-800ppm; the average particle size of TC4 powder is 50μm, and the oxygen content is 600-800ppm;

[0069] S2, Square packaging powder and vacuum extraction:

[0070] TiAl3 powder and pure Ti powder are proportioned and uniformly mixed according to Ti-47Al powder, and then loaded into a square sleeve by a vibration method, and fully vibrated and filled to form a Ti-47Al powder layer with a thickness of 3 mm; TC4 powder is then loaded into the sleeve, and fully vibrated and filled to form a TC4 powder layer with a thickness of 3 mm; Ti-47Al powder layers and TC4 powder layers are alternately stacked to finally obtain 25 layers of powder blanks, and the bottom layer and top layer of the powder blanks are both Ti-47Al powder layers; when the powder blank reaches a predetermined thickness, the sleeve is sealed and welded, and the exhaust hole is located at the minimum cross-section of the square sleeve, and vacuum exhaust treatment is performed, and finally the exhaust hole is sealed and welded;

[0071] S3, hot rolling with jacket:

[0072] The sealed and welded sheath is placed in an induction coil heating furnace, heated to 1250°C and kept warm for 15 minutes, and then rolled directly. The total deformation of multiple rolling passes is 70%, and the final rolling temperature of each pass is controlled to be ≥1200°C. After each rolling pass, the next rolling pass is carried out after returning to the furnace for 8 minutes to average the temperature. When the total deformation of the billet to be rolled is ≤30%, the linear speed of the roll is 30mm / s, and the deformation of the pass is 35%; when the total deformation of the billet to be rolled is 30-70%, the linear speed of the roll is 110mm / s, and the deformation of the pass is 20%; finally, the sheath is removed after cooling in the furnace to obtain a TiAl / TC4 alloy composite plate with fine grains, excellent performance and a plate size of 200*70*1.6mm.

[0073] Embodiment 3:

[0074] S1. Powder selection:

[0075] The average particle size of TiAl3 powder is 60μm, and the oxygen content is 400-600ppm; the average particle size of pure Ti powder is 60μm, and the oxygen content is 600-800ppm; the average particle size of TC4 powder is 60μm, and the oxygen content is 600-800ppm;

[0076] S2, Square packaging powder and vacuum extraction:

[0077] TiAl3 powder and pure Ti powder are proportioned and uniformly mixed according to Ti-48Al powder, and then loaded into a square sleeve by a vibration method, and fully vibrated and filled to form a Ti-48Al powder layer with a thickness of 4 mm; TC4 powder is then loaded into the sleeve, and fully vibrated and filled to form a TC4 powder layer with a thickness of 4 mm; Ti-48Al powder layers and TC4 powder layers are alternately stacked to finally obtain a 21-layer powder blank, and the bottom layer and top layer of the powder blank are both Ti-48Al powder layers; when the powder blank reaches a predetermined thickness, the sleeve is sealed and welded, and the exhaust hole is located at the minimum cross-section of the square sleeve, and vacuum exhaust treatment is performed, and finally the exhaust hole is sealed and welded;

[0078] S3, hot rolling with jacket:

[0079] The sealed and welded sheath is placed in an induction coil heating furnace, heated to 1300°C and kept warm for 20 minutes, and then rolled directly. The total deformation of multiple rolling passes is 60%, and the final rolling temperature of each pass is controlled to be ≥1200°C. After each rolling pass, the next rolling pass is carried out after returning to the furnace for 10 minutes to average the temperature. When the total deformation of the billet to be rolled is ≤30%, the linear speed of the roll is 40mm / s, and the deformation of the pass is 30%; when the total deformation of the billet to be rolled is 30-60%, the linear speed of the roll is 100mm / s, and the deformation of the pass is 15%; finally, the sheath is removed after cooling in the furnace to obtain a TiAl / TC4 alloy composite plate with fine grains, excellent performance and a plate size of 200*60*1.4mm.

[0080] Embodiment 4:

[0081] S1. Powder selection:

[0082] The average particle size of TiAl3 powder is 55μm, and the oxygen content is 400-600ppm; the average particle size of pure Ti powder is 55μm, and the oxygen content is 600-800ppm; the average particle size of TC4 powder is 55μm, and the oxygen content is 600-800ppm;

[0083] S2, Square packaging powder and vacuum extraction:

[0084] TiAl3 powder and pure Ti powder are proportioned and uniformly mixed according to Ti-48Al powder, and then loaded into a square sleeve by a vibration method, and fully vibrated and filled to form a Ti-48Al powder layer with a thickness of 8 mm; TC4 powder is then loaded into the sleeve, and fully vibrated and filled to form a TC4 powder layer with a thickness of 8 mm; Ti-48Al powder layers and TC4 powder layers are alternately stacked to finally obtain a 7-layer powder blank, and the bottom layer and top layer of the powder blank are both Ti-48Al powder layers; when the powder blank reaches a predetermined thickness, the sleeve is sealed and welded, and the exhaust hole is located at the minimum cross-section of the square sleeve, and vacuum exhaust treatment is performed, and finally the exhaust hole is sealed and welded;

[0085] S3, hot rolling with jacket:

[0086] The sealed and welded sheath is placed in an induction coil heating furnace, heated to 1300°C and kept warm for 15 minutes, and then rolled directly. The total deformation of multiple rolling passes is 75%, and the final rolling temperature of each pass is controlled to be ≥1200°C. After each rolling pass, the next rolling pass is carried out after returning to the furnace for 10 minutes to average the temperature. When the total deformation of the billet to be rolled is ≤30%, the linear speed of the roll is 35mm / s, and the deformation of the pass is 30%; when the total deformation of the billet to be rolled is 30-60%, the linear speed of the roll is 110mm / s, and the deformation of the pass is 15%; finally, the sheath is removed after cooling in the furnace to obtain a TiAl / TC4 alloy composite plate with fine grains, excellent performance and a plate size of 190*70*1.5mm.

[0087] In the present invention, conventional testing methods are used to test the mechanical properties of the TiAl / TC4 alloy laminated composite plate obtained in the embodiment, wherein the room temperature tensile strength of the TiAl / TC4 alloy laminated composite plate is ≥980MPA, the room temperature plasticity is 4-5%, the 700℃ tensile strength is 760MPA, and the 700℃ plasticity is 8-9%.

[0088] It should be noted that room temperature is also generally referred to as normal temperature or general temperature, which is generally defined as 25°C.

[0089] The analysis of crack propagation behavior shows that in the traditional titanium aluminum foil stacking preparation method, cracks are generated and extended from the interface joint. After expanding to a certain stage, they deflect when approaching the next layer, but the overall direction of the cracks is straight and approximates a broken line, which makes it relatively easy to develop and extend. In the powder stacking preparation method, cracks are no longer easily generated from the interface joint, and the development direction of the cracks is more tortuous, making it difficult for them to continue to extend.

[0090] Moreover, the thickness of the TiAl / TC4 alloy laminated composite plate can be in the range of 1.4 to 1.6 mm, thereby achieving the purpose of reducing the thickness of the plate.

[0091] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A short-process preparation method for a TiAl / TC4 alloy composite sheet, characterized in that: The following steps are involved: TiAl3 powder, pure Ti powder and TC4 powder are used as raw materials, and the TiAl3 powder and the pure Ti powder are uniformly mixed according to a powder ratio to obtain Ti-Al powder; the average particle size of the TC4 powder is 40-60 μm, and the oxygen content is 600-800 ppm; The Ti-Al powder and the TC4 powder are alternately loaded into the package in sequence, and are respectively filled to a certain thickness to form a layered powder blank in which Ti-Al powder layers and TC4 powder layers are alternately stacked on each other, and the bottom layer and the top layer of the powder blank are both Ti-Al powder layers; The package is sealed and welded, and then the sealed and welded package and the powder blank are rolled for multiple times to obtain a TiAl / TC4 alloy composite plate; The rolling process includes: heating to 1200-1350°C, keeping the temperature for 10-20 minutes, and then rolling the powder billet, with the total deformation of multiple rolling passes being 60-80%; wherein the final rolling temperature of each pass is controlled to be ≥1200°C, and after each rolling pass, the billet is returned to the furnace for 5-10 minutes to average the temperature before the next rolling pass.

2. The preparation method according to claim 1, characterized in that The powder blank is rolled using an induction coil heating furnace.

3. The preparation method according to claim 1 or 2, characterized in that: During the rolling process, when the total deformation of the powder blank is ≤30%, the roller linear speed is 20-40 mm / s, and the deformation per pass is 30-40%; when the total deformation of the powder blank is 30-80%, the roller linear speed is 100-120 mm / s, and the deformation per pass is 15-25%.

4. The preparation method according to claim 1, characterized in that: The number of layers of the powder blank is 2N+1, wherein N is an integer of 1-50.

5. The preparation method according to claim 1 or 4, characterized in that: The thickness of each Ti-Al powder layer is 1-10 mm, and the thickness of each TC4 powder layer is 1-10 mm.

6. The preparation method according to claim 5, characterized in that: The thickness of each Ti-Al powder layer is 2-4 mm, and the thickness of each TC4 powder layer is 2-4 mm.

7. The preparation method according to claim 1, characterized in that: The Ti-Al powder and the TC4 powder are alternately loaded into the package in sequence by a vibration method and fully vibrated and filled to obtain the powder blank.

8. The preparation method according to claim 1, characterized in that: In the Ti-Al powder, the percentage of Al atoms in the total number of all atoms is 40-50%.

9. The preparation method according to claim 1, characterized in that: The TiAl3 powder has an average particle size of 40-60 μm and an oxygen content of 400-600 ppm; The average particle size of the pure Ti powder is 40-60 μm, and the oxygen content is 600-800 ppm.

10. The TiAl / TC4 alloy laminated composite sheet prepared by the preparation method according to any one of claims 1 to 9, characterized in that: The organizational structure of the TiAl / TC4 alloy laminated composite plate comprises Ti-Al alloy layers and TC4 alloy layers stacked in sequence, and both the bottom layer and the top layer are Ti-Al alloy layers; there is a "serrated" connection interface between the Ti-Al alloy layer and the TC4 alloy layer; Wherein, the Ti—Al alloy layer is formed by doping Ti3Al phase and TiAl phase.

11. The TiAl / TC4 alloy laminated composite sheet according to claim 10, characterized in that: The room temperature tensile strength of the TiAl / TC4 alloy laminated composite plate is ≥980MPA, and the tensile strength at 700°C is 760MPA.

12. The TiAl / TC4 alloy laminated composite sheet according to claim 10, characterized in that: The thickness of the TiAl / TC4 alloy laminated composite plate is 1.4-1.6 mm.