Preparation method of titanium-aluminum intermetallic compound disc with uniform structure property

Abstract

The invention discloses a preparation method of a titanium-aluminum intermetallic compound disc with uniform structure properties, relates to the technical field of preparation of titanium-aluminum intermetallic compounds, and provides a method for preparing the titanium-aluminum intermetallic compound disc by combining hot extrusion and vacuum isothermal forging technologies, so that high-quality forming of the titanium-aluminum intermetallic compound disc can be realized. The titanium-aluminum intermetallic compound disc prepared through the method is uniform and fine in microscopic structure and excellent in mechanical property, can meet the service working conditions of disc components for aerospace engines, and has important commercial value.

Description

Technical Field

[0001] The invention relates to the technical field of titanium-aluminum intermetallic compound preparation, and in particular to a method for preparing a titanium-aluminum intermetallic compound disk with uniform organizational properties. Background Art

[0002] As a new type of lightweight high-temperature resistant structural material, titanium-aluminum intermetallic compounds have excellent performance characteristics such as low density, high specific strength, high specific stiffness, good oxidation resistance, creep resistance, fatigue resistance, and good flame retardancy. The service temperature range reaches 600-900℃. It is an ideal lightweight high-temperature resistant metal structural material to replace high-density high-temperature alloys, and has broad application prospects in aviation, aerospace and engine industries. In aerospace engines, disks including compressor disks, turbine disks, and integral blades are one of the most important parts. The life of the disks seriously affects the overall life of the engine. At present, the disk materials with a temperature resistance of more than 550℃ are mainly nickel-based high-temperature alloys. Since the density of titanium-aluminum intermetallic compounds is only half of that of nickel-based high-temperature alloys, the use of titanium-aluminum intermetallic compounds instead of high-temperature alloys can achieve a 40-60% weight reduction of disks, thereby greatly improving the thrust-to-weight ratio and other performance of aerospace engines.

[0003] Since titanium-aluminum intermetallic compounds contain covalent bonds, have intrinsic brittleness, and have poor thermal processing performance, for titanium-aluminum intermetallic compound ingots directly prepared by melt casting or powder metallurgy technology, titanium-aluminum intermetallic compounds that have not been hot-processed and opened have low mechanical properties and uneven performance due to problems such as coarse structure, uneven structure, or defects such as holes, and are not suitable for the use requirements of high-speed rotating disks. If the titanium-aluminum intermetallic compound ingots directly prepared by melt casting or powder metallurgy technology are directly forged at high temperature, it is impossible to achieve the purpose of completely refining the structure, improving the uniformity of the structure, and eliminating defects such as holes. The mechanical properties of the prepared disks will inevitably still not meet the needs of the engine. Hot extrusion technology is a hot processing and opening method that effectively improves the organizational properties and defects of titanium-aluminum intermetallic compounds, and can achieve the purpose of refining grains and eliminating hole defects. However, due to the extrusion effect during the hot extrusion of titanium-aluminum intermetallic compounds, extrusion streamlines will be formed inside the material. This is because at a high extrusion deformation rate, dynamic recrystallization is insufficient, the grains will be elongated and rotated, the grains will be significantly refined along the hot extrusion direction, and an extrusion texture will gradually form. The formation of extrusion streamlines will cause the structure of the extruded rod to be uneven and anisotropic. For engine discs that rotate at high speeds, the materials prepared by extrusion alone still cannot meet the performance requirements of engine discs due to problems such as uneven structure and anisotropy. This requires further high-temperature forging to eliminate the anisotropy in the extrusion direction, improve the uniformity of the structure, and form the discs at the same time. However, due to the uneven temperature field, the near-isothermal forging technology is not suitable for the preparation of engine discs that require extremely high structural uniformity. In response to the above problems, the hot extrusion and vacuum isothermal forging technology proposed in the present invention are combined to prepare titanium-aluminum intermetallic compound discs, which can significantly improve the uniformity of the structural properties of titanium-aluminum intermetallic compounds. Summary of the invention

[0004] The present invention aims to solve the above-mentioned problems existing in the preparation of titanium-aluminum intermetallic compound disks, and proposes a method for preparing titanium-aluminum intermetallic compound disks with uniform organizational properties.

[0005] The method for preparing a titanium-aluminum intermetallic compound disk with uniform organizational properties of the present invention is carried out according to the following steps:

[0006] Step 1: heat-treating the hot-extruded titanium-aluminum intermetallic compound profile, and then machining it into a preformed billet that meets the size requirements of the forged disc, and evenly coating a layer of forging lubricant on the surface of the titanium-aluminum intermetallic compound preformed billet and the surface of the forging die of the vacuum isothermal forging equipment;

[0007] Step 2: After the forging lubricant to be applied is dried, the titanium-aluminum intermetallic compound preform is placed on the lower die of the forging die of the vacuum isothermal forging equipment. The billet is placed in such a way that the hot extrusion direction of the titanium-aluminum intermetallic compound preform is the same as the forging direction. The equipment is evacuated until the vacuum degree reaches 10 -4 After the pressure reaches 50 Pa, heating begins. When the temperature reaches 1000-1390°C, insulation is performed for 1-200 minutes.

[0008] Step 3: After the insulation is completed, the titanium-aluminum intermetallic compound preform is subjected to vacuum isothermal forging, the forging temperature is 1000-1390°C, the forging reduction rate is 0.0001-70mm / s, and isothermal holding is performed after the material reduction reaches the preset deformation amount. The preset deformation amount is 10-95%, the holding time is 1-200min, and the holding temperature is 1000-1390°C. After the holding is completed, it is cooled to obtain the titanium-aluminum intermetallic compound forging.

[0009] Furthermore, the titanium-aluminum intermetallic compound described in step 1 is prepared by a melt casting method or a powder metallurgy method before hot extrusion.

[0010] Furthermore, the titanium-aluminum intermetallic compound hot extrusion method described in step 1 is a sheath hot extrusion method, the extrusion temperature is 1150-1380° C., and the extrusion ratio is 2-35.

[0011] Furthermore, the heat treatment temperature in step 1 is 850-1380° C., and the heat treatment time is 5 minutes to 25 hours.

[0012] Furthermore, the heat treatment in step 1 is vacuum heat treatment, inert gas protection heat treatment or heat treatment with a sheath in the atmosphere and the sheath is removed after the heat treatment.

[0013] Furthermore, the forging lubricant described in step 2 is one or more of boron nitride lubricant, glass lubricant, and graphite lubricant.

[0014] Further, the device is evacuated as described in step 2 until the vacuum degree reaches 10 -4 After the pressure reaches 50 Pa, heating begins. When the temperature reaches 1100-1300°C, insulation is carried out for 1-200 minutes.

[0015] Further, the device is evacuated as described in step 2 until the vacuum degree reaches 10 -1 After the pressure reaches 50 Pa, heating begins. When the temperature reaches 1100-1300°C, insulation is carried out for 1-200 minutes.

[0016] Furthermore, the vacuum isothermal forging conditions in step 3 are as follows: the forging temperature is 1100-1300°C, the forging reduction rate is 0.001-50 mm / s, and isothermal holding is performed after the material reduction reaches a preset deformation amount. The preset deformation amount is 20-80%, the holding time is 1-200 min, and the holding temperature is 1100-1300°C.

[0017] Furthermore, the vacuum isothermal forging conditions in step 3 are: forging temperature is 1200-1390°C, forging reduction rate is 0.1-50 mm / s, isothermal holding is performed after the material reduction reaches a preset deformation amount, the preset deformation amount is 30-90%, the holding time is 1-200 min, and the holding temperature is 1200-1390°C.

[0018] In view of the characteristics of titanium-aluminum intermetallic compounds and the requirements for the microstructure and performance of engine discs, the present invention proposes a method combining hot extrusion and vacuum isothermal forging technology to prepare titanium-aluminum intermetallic compound discs, and the titanium-aluminum intermetallic compound profiles prepared by hot extrusion and heat treatment are machined into preforms that meet the size requirements of forged discs, and the titanium-aluminum intermetallic compound preforms are vacuum isothermally forged in the extrusion direction to form discs. The method proposed by the present invention has significant advantages. First, hot extrusion can ensure the refinement of grains and the elimination of defects, but there is anisotropy. Further, by performing vacuum isothermal forging along the extrusion direction, anisotropy can be very effectively eliminated, thereby preparing discs with uniform microstructure and performance and high performance. Therefore, this method can significantly reduce defects such as holes in discs, refine grains, and improve the uniformity of microstructure and performance, and can meet the performance requirements of aerospace engine discs for titanium-aluminum intermetallic compounds.

[0019] The present invention has the following beneficial effects:

[0020] (1) For the first time, it was proposed to use a combination of hot extrusion and vacuum isothermal forging to prepare titanium-aluminum intermetallic compound disks for aerospace engines. The prepared titanium-aluminum intermetallic compound disks have uniform and fine microstructures, and defects such as holes are eliminated, which can effectively meet the working conditions and performance requirements of aerospace engine disks.

[0021] (2) The deformation under isothermal forging conditions is more uniform, and the titanium-aluminum intermetallic compound disk will not have deformation differences caused by the uneven temperature field. On the one hand, this uniform deformation will not cause local stress concentration due to the temperature difference at different positions of the titanium-aluminum intermetallic compound, and on the other hand, it will not cause uneven deformation structure due to uneven temperature. Uniform deformation and uniform structure will inevitably lead to uniform and excellent mechanical properties of the titanium-aluminum intermetallic compound disk.

[0022] (3) The use of vacuum forging eliminates the impact of severe oxidation during the forging process of titanium-aluminum intermetallic compounds, allowing precision die forging, which is more suitable for the precision forging of discs. This not only reduces manufacturing costs, but also prevents the mechanical properties of titanium-aluminum intermetallic compound discs from deteriorating due to oxidation.

[0023] Therefore, the method for preparing titanium-aluminum intermetallic compound disks with uniform organizational properties proposed in the present invention is a method for preparing high-quality disks. The titanium-aluminum intermetallic compound disks prepared by this method have excellent mechanical properties, meet the service conditions of disk-type components for aerospace engines, and have important commercial value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The prepared Ti-45Al-4Nb-0.5Mo-0.1B alloy disk;

[0025] Figure 2 The microstructure of the prepared Ti-45Al-4Nb-0.5Mo-0.1B alloy disk;

[0026] Figure 3 The microstructure of the prepared Ti-44.5Al-8Nb-0.2Y alloy disk;

[0027] Figure 4 This is the microstructure diagram of the prepared Ti-43.5Al-4Nb-1Mo-0.08B alloy disk. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention more clearly understood, the spirit of the contents disclosed by the present invention will be described in detail below. After understanding the embodiments of the contents of the present invention, any technician in the relevant technical field can change and modify them according to the techniques taught by the contents of the present invention without departing from the spirit and scope of the contents of the present invention.

[0029] The exemplary embodiments of the present invention and the description thereof are used to explain the present invention but are not intended to limit the present invention.

[0030] Embodiment 1:

[0031] A titanium-aluminum intermetallic compound cylindrical ingot with a nominal composition of Ti-45Al-4Nb-0.5Mo-0.1B (at.%) prepared by a melting and casting method is selected for annealing and a sheathing treatment before hot extrusion is performed. Then, a titanium-aluminum intermetallic compound disc is prepared by combining hot extrusion and vacuum isothermal forging. The specific process is as follows:

[0032] (1) hot extruding a cylindrical titanium-aluminum intermetallic compound ingot with a jacket, then annealing the titanium-aluminum intermetallic compound with the jacket at 900° C. for 5 hours, removing the jacket to prepare a titanium-aluminum intermetallic compound rod, and cutting and processing the titanium-aluminum intermetallic compound rod into a cylindrical billet with a diameter of 100 mm and a height of 150 mm, wherein the height direction of the cylindrical titanium-aluminum intermetallic compound billet is consistent with the extrusion direction of the rod;

[0033] (2) a layer of glass lubricant is uniformly applied on the surface of a cylindrical titanium-aluminum intermetallic compound blank and the surface of a forging die of a vacuum isothermal forging device;

[0034] (3) After the coated lubricant is dried, the cylindrical titanium-aluminum intermetallic compound blank is placed on the lower die of the forging die of the vacuum isothermal forging equipment. The blank is placed in such a way that the height direction of the blank is the same as the forging direction to ensure that the hot extrusion direction of the blank is the same as the forging direction. The equipment is evacuated until the vacuum degree reaches 10 -2 After Pa, heating begins, and the set heating temperature is 1200℃. When the blank and the mold reach 1200℃, they are kept warm for 20min.

[0035] (4) After the heat preservation is completed, the cylindrical titanium-aluminum intermetallic compound billet is subjected to vacuum isothermal forging, the forging temperature is 1200°C, the forging reduction rate is 0.1 mm / s, and the pressure holding is started after the material reduction reaches 75% of the deformation. The pressure holding time is 10 min, and the pressure holding temperature is consistent with the forging temperature. After the pressure holding is completed, the billet is cooled with the furnace;

[0036] (5) After cooling to 500° C., the titanium-aluminum intermetallic compound forging is taken out from the vacuum isothermal forging equipment, and the lubricant on the surface of the forging is removed by sandblasting or grinding to prepare a titanium-aluminum intermetallic compound disc.

[0037] Figure 1 The prepared Ti-45Al-4Nb-0.5Mo-0.1B alloy disk has a smooth appearance and no defects. Its microstructure is shown in the figure below. Figure 2 As shown, the grains are small and uniform. Figure 1 The room temperature tensile properties of the samples taken at the three positions A, B and C were tested, and the tensile strengths were 925MPa, 920MPa and 929MPa respectively, and the uniformity of mechanical properties was ideal. The above results show that the method proposed in the present invention for preparing Ti-45Al-4Nb-0.5Mo-0.1B alloy discs by combining hot extrusion and vacuum isothermal forging can obtain discs with uniform microstructure and mechanical properties.

[0038] Comparative Example 1:

[0039] A titanium-aluminum intermetallic compound cylindrical ingot with a nominal composition of Ti-45Al-4Nb-0.5Mo-0.1B (at.%) prepared by a melting and casting method is selected for annealing and jacketing treatment before hot extrusion. Then, a titanium-aluminum intermetallic compound disc is prepared by combining hot extrusion with near-isothermal jacketing forging under atmosphere. The specific process is as follows:

[0040] (1) hot extruding a cylindrical titanium-aluminum intermetallic compound ingot with a jacket, then annealing the titanium-aluminum intermetallic compound with the jacket at 900° C. for 5 hours, removing the jacket to prepare a titanium-aluminum intermetallic compound rod, and cutting and processing the titanium-aluminum intermetallic compound rod into a cylindrical billet with a diameter of 100 mm and a height of 150 mm, wherein the height direction of the cylindrical titanium-aluminum intermetallic compound billet is consistent with the extrusion direction of the rod;

[0041] (2) The cylindrical titanium-aluminum intermetallic compound billet is subjected to a sheathing treatment, and the sheathed cylindrical titanium-aluminum intermetallic compound is placed on the lower die of the forging die of the high-temperature forging equipment for near-isothermal sheathing forging in the atmosphere. The sheathed billet is placed in such a way that the billet height direction is the same as the forging direction to ensure that the hot extrusion direction of the billet is the same as the forging direction. The heating temperature of the titanium-aluminum intermetallic compound is 1200°C, and the heating temperature of the forging die is 1000°C. When the billet and the die reach the set temperature, they are kept warm for 20 minutes. After the insulation is completed, near-isothermal sheathing forging is performed, the forging die temperature is 1000°C, the forging reduction rate is 0.1 mm / s, and the pressure holding is started after the material reduction reaches 75% of the deformation. The pressure holding time is 10 minutes, and the pressure holding temperature is consistent with the forging die temperature. After the pressure holding is completed, the billet is cooled with the furnace;

[0042] (3) After cooling to 500° C., the titanium-aluminum intermetallic compound forging is taken out, and the lubricant on the surface of the forging is removed by sandblasting or grinding to prepare a titanium-aluminum intermetallic compound disk.

[0043] The difference between Comparative Example 1 and Example 1 is that the high temperature forging adopts the near isothermal jacket forging. Due to the temperature drop in this forging process, the temperature field is not uniform, so the uniformity of the microstructure and performance is poor. Figure 1 The tensile strengths of the samples tested at three points at the same position were 733 MPa, 912 MPa, and 876 MPa, respectively. Compared with Example 1, the performance uniformity was significantly reduced, and it was not suitable for the preparation of engine discs.

[0044] Comparative Example 2:

[0045] A titanium-aluminum intermetallic compound cylindrical ingot with a nominal composition of Ti-45Al-4Nb-0.5Mo-0.1B (at.%) prepared by a melting and casting method is annealed and isothermally forged in vacuum to prepare a titanium-aluminum intermetallic compound disc. The specific process is as follows:

[0046] (1) processing the annealed cylindrical titanium-aluminum intermetallic compound ingot into a cylindrical billet with a diameter of 100 mm and a height of 150 mm;

[0047] (2) a layer of glass lubricant is uniformly applied on the surface of a cylindrical titanium-aluminum intermetallic compound blank and the surface of a forging die of a vacuum isothermal forging device;

[0048] (3) After the lubricant is dried, the cylindrical titanium-aluminum intermetallic compound blank is placed on the lower die of the forging die of the vacuum isothermal forging equipment, and the equipment is evacuated until the vacuum degree reaches 10 -2 After Pa, heating begins, and the set heating temperature is 1200℃. When the blank and the mold reach 1200℃, they are kept warm for 20min.

[0049] (4) After the heat preservation is completed, the cylindrical titanium-aluminum intermetallic compound billet is subjected to vacuum isothermal forging, the forging temperature is 1200°C, the forging reduction rate is 0.1 mm / s, and the pressure holding is started after the material reduction reaches 75% of the deformation. The pressure holding time is 10 min, and the pressure holding temperature is consistent with the forging temperature. After the pressure holding is completed, the billet is cooled with the furnace;

[0050] (5) After cooling to 500° C., the titanium-aluminum intermetallic compound forging is taken out from the vacuum isothermal forging equipment, and the lubricant on the surface of the forging is removed by sandblasting or grinding to prepare a titanium-aluminum intermetallic compound disc.

[0051] The difference between Comparative Example 2 and Example 1 is that no hot extrusion is performed, but the ingot is directly subjected to vacuum isothermal forging. Due to the lack of hot extrusion process, the uniformity of the microstructure and performance is also poor. Figure 1 The tensile strengths of the samples tested at three points at the same position were 538 MPa, 634 MPa, and 715 MPa, respectively. Compared with Example 1, the performance uniformity was significantly reduced, and it was not suitable for the preparation of engine discs.

[0052] Embodiment 2:

[0053] A titanium-aluminum intermetallic compound cylindrical ingot with a nominal composition of Ti-44.5Al-8Nb-0.2Y (at.%) prepared by melt casting technology is selected for sheathing treatment before hot extrusion, and then a titanium-aluminum intermetallic compound disc is prepared by combining hot extrusion and vacuum isothermal forging. The specific process is as follows:

[0054] (1) hot extruding a cylindrical titanium-aluminum intermetallic compound ingot with a sheath, then annealing the titanium-aluminum intermetallic compound with the sheath at 950° C. for 20 hours, removing the sheath to prepare a titanium-aluminum intermetallic compound rod, cutting and processing the titanium-aluminum intermetallic compound rod into a cylindrical billet with a diameter of 150 mm and a height of 250 mm, wherein the height direction of the cylindrical titanium-aluminum intermetallic compound billet is consistent with the extrusion direction of the rod;

[0055] (2) uniformly coating a layer of boron nitride lubricant on the surface of a cylindrical titanium-aluminum intermetallic compound blank and the surface of a forging die of a vacuum isothermal forging device;

[0056] (3) After the coated lubricant is dried, the cylindrical titanium-aluminum intermetallic compound blank is placed on the lower die of the forging die of the vacuum isothermal forging equipment. The blank is placed in such a way that the height direction of the blank is the same as the forging direction to ensure that the hot extrusion direction of the blank is the same as the forging direction. The equipment is evacuated until the vacuum degree reaches 10 -1 After Pa, heating begins, and the set heating temperature is 1280℃. When the blank and the mold reach 1280℃, they are kept warm for 30min.

[0057] (4) After the heat preservation is completed, the cylindrical titanium-aluminum intermetallic compound billet is subjected to vacuum isothermal forging, the forging temperature is 1280°C, the forging reduction rate is 0.05 mm / s, and the pressure holding is started after the material reduction reaches 80% of the deformation. The pressure holding time is 15 min, and the pressure holding temperature is consistent with the forging temperature. After the pressure holding is completed, the billet is cooled with the furnace;

[0058] (5) After cooling to room temperature, the titanium-aluminum intermetallic compound forging is taken out from the vacuum isothermal forging equipment, and the lubricant on the surface of the forging is removed by sandblasting or grinding to prepare a titanium-aluminum intermetallic compound disc.

[0059] The prepared Ti-44.5Al-8Nb-0.2Y alloy disk has a smooth appearance and no defects. Its microstructure is shown in the figure below. Figure 3 As shown, the grains are fine and uniform. The Ti-44.5Al-8Nb-0.2Y alloy disc is different from Example 1. Figure 1 The tensile strengths of the samples tested at the same position were 978MPa, 985MPa, and 982MPa, respectively, and the uniformity of mechanical properties was ideal. The above results show that the method proposed in the present invention for preparing Ti-44.5Al-8Nb-0.2Y alloy discs by combining hot extrusion and vacuum isothermal forging can obtain discs with uniform microstructure and mechanical properties.

[0060] Embodiment 3:

[0061] A titanium-aluminum intermetallic compound cylindrical ingot with a nominal composition of Ti-43.5Al-4Nb-1Mo-0.08B alloy (at.%) prepared by hot isostatic pressing powder metallurgy technology is selected for sheathing treatment before hot extrusion, and then a titanium-aluminum intermetallic compound disc is prepared by combining hot extrusion and vacuum isothermal forging. The specific process is as follows:

[0062] (1) hot extruding a cylindrical titanium-aluminum intermetallic compound ingot by encapsulation, then annealing the encapsulated titanium-aluminum intermetallic compound at 920° C. for 10 hours, removing the encapsulation to prepare a titanium-aluminum intermetallic compound rod, and cutting and processing the titanium-aluminum intermetallic compound rod into a cylindrical billet with a diameter of 80 mm and a height of 140 mm, wherein the height direction of the cylindrical titanium-aluminum intermetallic compound billet is consistent with the extrusion direction of the rod;

[0063] (2) uniformly coating a layer of graphite lubricant on the surface of a cylindrical titanium-aluminum intermetallic compound blank and the surface of a forging die of a vacuum isothermal forging device;

[0064] (3) After the coated lubricant is dried, the cylindrical titanium-aluminum intermetallic compound blank is placed on the lower die of the forging die of the vacuum isothermal forging equipment. The blank is placed in such a way that the height direction of the blank is the same as the forging direction to ensure that the hot extrusion direction of the blank is the same as the forging direction. The equipment is evacuated until the vacuum degree reaches 10 -1 After Pa, heating begins, and the set heating temperature is 1180℃. When the blank and the mold reach 1180℃, they are kept warm for 5 minutes.

[0065] (4) After the heat preservation is completed, the cylindrical titanium-aluminum intermetallic compound billet is subjected to vacuum isothermal forging, the forging temperature is 1180°C, the forging reduction rate is 0.01 mm / s, and the pressure holding is started after the material reduction reaches 85% of the deformation. The pressure holding time is 5 min, and the pressure holding temperature is consistent with the forging temperature. After the pressure holding is completed, the billet is cooled with the furnace;

[0066] (5) After cooling to 300° C., the titanium-aluminum intermetallic compound forging is taken out from the vacuum isothermal forging equipment, and the lubricant on the surface of the forging is removed by sandblasting or grinding to prepare a titanium-aluminum intermetallic compound disc.

[0067] The prepared Ti-43.5Al-4Nb-1Mo-0.08B alloy disk has a smooth appearance and no defects. Its microstructure is shown in the figure below. Figure 4 As shown, the grains are fine and uniform. The Ti-43.5Al-4Nb-1Mo-0.08B alloy disc is different from the one in Example 1. Figure 1The tensile strengths of the samples tested at the same position at three points were 848MPa, 837MPa, and 839MPa, respectively, and the uniformity of mechanical properties was ideal. The above results show that the method proposed in the present invention for preparing Ti-43.5Al-4Nb-1Mo-0.08B alloy discs by combining hot extrusion and vacuum isothermal forging can obtain discs with uniform microstructure and mechanical properties.

[0068] The present invention is not limited to the enumerated embodiments, and the improvements and changes made according to this method and on the basis of this method are all included in the patent scope of the present invention.

Claims

1. A method for preparing a titanium-aluminum intermetallic compound disk with uniform structure and performance, characterized in that It is carried out according to the following steps: Step 1: heat-treating the hot-extruded titanium-aluminum intermetallic compound profile, and then machining it into a preformed billet that meets the size requirements of the forged disc, and evenly coating a layer of forging lubricant on the surface of the titanium-aluminum intermetallic compound preformed billet and the surface of the forging die of the vacuum isothermal forging equipment; Step 2: After the forging lubricant to be applied is dried, the titanium-aluminum intermetallic compound preform is placed on the lower die of the forging die of the vacuum isothermal forging equipment. The billet is placed in such a way that the hot extrusion direction of the titanium-aluminum intermetallic compound preform is the same as the forging direction. The equipment is evacuated until the vacuum degree reaches 10 -4 After the pressure reaches 50 Pa, heating begins. When the temperature reaches 1000-1390°C, insulation is performed for 1-200 minutes. Step 3: After the insulation is completed, the titanium-aluminum intermetallic compound preform is subjected to vacuum isothermal forging, the forging temperature is 1000-1390°C, the forging reduction rate is 0.0001-70mm / s, and isothermal holding is performed after the material reduction reaches the preset deformation amount. The preset deformation amount is 10-95%, the holding time is 1-200min, and the holding temperature is 1000-1390°C. After the holding is completed, it is cooled to obtain the titanium-aluminum intermetallic compound forging.

2. The method for preparing a titanium-aluminum intermetallic compound disk with uniform structure and properties according to claim 1, characterized in that The titanium-aluminum intermetallic compound described in step 1 is prepared by a melt casting method or a powder metallurgy method before hot extrusion.

3. The method for preparing a titanium-aluminum intermetallic compound disk with uniform structure and properties according to claim 1, characterized in that The hot extrusion method of the titanium-aluminum intermetallic compound described in step 1 is a sheath hot extrusion method, the extrusion temperature is 1150-1380° C., and the extrusion ratio is 2-35.

4. The method for preparing a titanium-aluminum intermetallic compound disk with uniform structure and properties according to claim 1, characterized in that The heat treatment temperature in step 1 is 850-1380° C., and the heat treatment time is 5 minutes-25 hours.

5. The method for preparing a titanium-aluminum intermetallic compound disk with uniform structure and properties according to claim 1 or 4, characterized in that The heat treatment in step 1 is vacuum heat treatment, inert gas protection heat treatment or heat treatment with a sheath in the atmosphere and removal of the sheath after the heat treatment.

6. The method for preparing a titanium-aluminum intermetallic compound disk with uniform structure and properties according to claim 1, characterized in that The forging lubricant described in step 2 is one or more of boron nitride lubricant, glass lubricant, and graphite lubricant.

7. The method for preparing a titanium-aluminum intermetallic compound disk with uniform structure and properties according to claim 1, characterized in that Evacuate the equipment as described in step 2 until the vacuum reaches 10 -4 After the pressure reaches 50 Pa, heating begins. When the temperature reaches 1100-1300°C, insulation is carried out for 1-200 minutes.

8. The method for preparing a titanium-aluminum intermetallic compound disk with uniform structure and properties according to claim 1, characterized in that Evacuate the equipment as described in step 2 until the vacuum reaches 10 -1 After the pressure reaches 50Pa, heating begins. When the temperature reaches 1000-1390℃, insulation is carried out for 1-200min.

9. The method for preparing a titanium-aluminum intermetallic compound disk with uniform structure and properties according to claim 1, characterized in that The vacuum isothermal forging conditions in step 3 are: forging temperature is 1100-1300°C, forging reduction rate is 0.001-50mm / s, isothermal holding is performed after the material reduction reaches the preset deformation, the preset deformation is 20-80%, the holding time is 1-200min, and the holding temperature is 1100-1300°C.

10. The method for preparing a titanium-aluminum intermetallic compound disk with uniform structure and properties according to claim 1 or 9, characterized in that The vacuum isothermal forging conditions in step 3 are: forging temperature is 1200-1390°C, forging reduction rate is 0.1-50 mm / s, isothermal holding is performed after the material reduction reaches the preset deformation amount, the preset deformation amount is 30-90%, the holding time is 1-200 min, and the holding temperature is 1200-1390°C.

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