A high-temperature titanium alloy for casting at 600°C and its preparation method

Abstract

The present invention provides a high-temperature titanium alloy for casting at 600°C and a preparation method thereof, belonging to the field of metal alloy material metallurgy. The titanium alloy composition is as follows by weight: Al 4.50-5.00%, Sn 3.50-4.00%, Zr 1.80-2.20%, Mo 0.50-3.00%, Si 0.20-0.40%, Nb 0.35-1.00%, Ta 0.35-1.00%, W 0.35-1.00%, Y 0-0.04%, B 0.020-0.050%, C 0.020-0.040%, and Ti balance. The present invention also optimizes the smelting preparation method of the high-temperature titanium alloy ingot, solves the problem of poor alloy composition uniformity, and can improve the mechanical properties of the cast high-temperature titanium alloy.

Description

Technical Field

[0001] The present invention belongs to the field of metal alloy material metallurgy, and in particular provides a Ti-Al-Sn-Zr-Mo-Si-Nb-Ta-WBCY system (abbreviated as TWBC) casting high-temperature titanium alloy composition for 600°C and a vacuum induction magnetic suspension melting preparation method thereof. Background Art

[0002] Titanium alloys are widely used in fields such as aerospace. High-temperature titanium alloys, in particular, can withstand temperatures of 400°C and above. As a representative of superior titanium alloys, they offer superior overall performance compared to conventional titanium alloys, particularly at high temperatures, with exceptional strength, creep, and fatigue properties. High-temperature titanium alloys are primarily prepared by casting. Complex structural products are not suitable for forging or rolling, while casting allows for efficient, one-piece forming and high raw material utilization. Compared to conventional cast titanium alloys, high-temperature titanium alloys have a high degree of alloying. Some alloying elements, such as W, Mo, Nb, and Ta, have higher melting points, making them difficult to melt and resulting in poor alloy uniformity. During the casting process, alloying elements such as Si, Sn, Zr, and Mo can reduce the alloy's fluidity and filling properties to varying degrees, degrading mold quality and significantly increasing defects such as shrinkage, shrinkage cavities, cracks, and inclusions. This reduces the alloy's plasticity and oxidation resistance, increases its tendency to hot cracking, and increases welding difficulties.

[0003] Vacuum induction magnetic levitation melting technology is one of the world's most advanced methods for melting easily oxidizable alloys. This method uses continuous electromagnetic induction heating within the charge, rapidly heating it and melting it. Intense electromagnetic stirring within the melt maintains uniform composition and temperature throughout the melt. The water-cooled copper crucible chills the metal charge, forming an extremely thin crust that separates the molten metal from the crucible wall, preventing reaction between the alloy melt and the crucible and preventing contamination of the crucible material. Summary of the Invention

[0004] In response to the deficiencies in the above-mentioned prior art, the present invention provides a cast high-temperature titanium alloy for use at 600°C and a preparation method thereof. The titanium alloy is a Ti-Al-Sn-Zr-Mo-Si-Nb-Ta-WBCY series (TWBC for short) cast titanium alloy. The present invention further improves the mechanical properties of the cast high-temperature titanium alloy by optimizing the composition of the cast high-temperature titanium alloy and improving the smelting method, and solves problems such as poor uniformity of the alloy composition.

[0005] The technical solution of the present invention is:

[0006] A high-temperature titanium alloy for casting at 600°C, characterized in that the composition of the titanium alloy is as follows by weight: Al 4.50-5.00%, Sn 3.50-4.00%, Zr 1.80-2.20%, Mo 0.50-3.00%, Si 0.20-0.40%, Nb 0.35-1.00%, Ta 0.35-1.00%, W 0.35-1.00%, Y 0-0.04%, B 0.020-0.050%, C 0.020-0.040%, and Ti balance.

[0007] As the preferred technical solution:

[0008] When the total content of Mo and Si is in the range of 2-3%, the tensile strength of the alloy at 600°C can reach above 600 MPa; when the isomorphous stabilizing elements Nb, Ta, and W are added in equal proportions, that is, when the content of Nb, Ta, and W is 0.5% each, the room temperature tensile strength of the alloy can reach above 1000 MPa.

[0009] The present invention provides a preparation method for the 600°C casting high-temperature titanium alloy, the specific steps of which are as follows:

[0010] (1) Weighing

[0011] According to the composition ratio of titanium alloy, titanium sponge, aluminum block, elemental elements and master alloy are weighed and placed in different containers according to their types for later use;

[0012] (2) Furnace loading

[0013] Place the graphite mold in the furnace pouring position, turn over the water-cooled copper crucible to calibrate the position of the mold, and then put the raw materials in step (1) into the water-cooled copper crucible;

[0014] (3) After closing the furnace door, vacuum is drawn. The vacuum is drawn in the following manner:

[0015] Use a mechanical pump to pre-vacuum until the vacuum degree reaches below 1000Pa, and then turn on the Roots pump to pre-vacuum until the vacuum degree reaches 1×10 -1 Pa, fill with argon to 5000Pa, repeat the above vacuum and argon filling process 3 times, and finally fill with argon to 10000-20000Pa to prepare for smelting;

[0016] (4) Melting

[0017] During smelting, first increase the power to 50kw and keep it for 1 minute; increase the power to 100kw and keep it for 1 minute; increase the power to 150kw and keep it for 1 minute; increase the power to 200kw and keep it until it is completely melted. If it cannot be completely melted at this power, increase the power to 250kw until all the raw materials are melted;

[0018] (5) Homogenization

[0019] After all the raw materials are melted, the alloy melt is kept in a suspended or semi-suspended state under the action of the suspension force. The power is maintained at 200kw for 10 minutes, then the power is reduced to 50kw and maintained for 1 minute. The power is then increased to 200kw and maintained for 10 minutes. The above power reduction and increase process is repeated 3 times. Through the action of electromagnetic stirring, the alloy composition is made more uniform.

[0020] (6) After smelting, the alloy melt is poured into a graphite mold and cooled as follows:

[0021] Use a mechanical pump to pre-vacuum until the vacuum degree reaches below 1000Pa, and then turn on the Roots pump to pre-vacuum until the vacuum degree reaches 1×10 -1 Pa below, keep vacuum state, and cool to room temperature;

[0022] (7) After cooling to room temperature, the vacuum is broken and the furnace door is opened to take out the alloy ingot in the graphite mold to obtain the alloy ingot.

[0023] As the preferred technical solution:

[0024] In step (1), the purity of the titanium sponge is 0A grade and the particle size is 0.84-12.7 mm;

[0025] The mass fraction of pure aluminum in the aluminum block is not less than 99.99%;

[0026] The element is one or more of zirconium sponge with a particle size of 3-25 mm, TD-2 grade tantalum flakes with a size of 2-10 mm, yttrium metal blocks with a size of 5-10 mm, boron powder with a particle size of 10-100 μm, and carbon powder with a particle size of 40-100 nm;

[0027] The master alloy refers to one or more of TiSn alloy, AlNb alloy, AlMo alloy, AlSi alloy, and AlW alloy.

[0028] The TiSn alloy is in a chip-like form with an 80% tin content; the AlNb alloy has a particle size of 1-30 mm and a niobium content of 62.1%; the AlMo alloy has a particle size of 1-6 mm and a molybdenum content of 60%; the AlSi alloy has a particle size of 1-15 mm and a silicon content of 10%; and the AlW alloy has a particle size of 0.25-6 mm and a tungsten content of 50%. Direct smelting of the Nb, Mo, and W elemental metals results in alloying element precipitation. Using the AlNb, AlMo, and AlW alloys, compared to directly using the Nb, Mo, and W elemental metals, effectively combines the alloying elements and achieves uniform composition.

[0029] The cast high-temperature titanium alloy prepared by the above method has the following room temperature properties: tensile strength ≥1000MPa, yield strength ≥904MPa, elongation ≥8.0%; the high temperature properties at 600℃ are: tensile strength ≥605MPa, yield strength ≥484MPa, elongation ≥15.0%.

[0030] The Ti-Al-Sn-Zr-Mo-Si-Nb-Ta-WBCY series cast high-temperature titanium alloy material described in the present invention has excellent room temperature and high-temperature properties, and suspension melting ensures the uniformity of the composition. The Ti-Al-Sn-Zr-Mo-Si-Nb-Ta-WBCY series cast high-temperature titanium alloy composition and its suspension melting casting method are expected to be used in high-end fields such as high-performance aerospace, specifically for the preparation of components such as aircraft engine blades, aircraft engine accessory casings, UAV engine flame shields, and supersonic aircraft engine important structural components such as air inlets, and can meet the needs of casting high-temperature titanium alloy components for applications at 600°C.

[0031] The beneficial effects of the present invention are:

[0032] 1. The alloy of the present invention contains 11 alloying elements, including Al, Sn, Zr, Mo, Si, Nb, Ta, W, B, C, and Y. When the total content of Mo and Si is in the range of 2-3%, the alloy's tensile strength at 600°C can reach over 600 MPa. When the isomorphous stabilizing elements Nb, Ta, and W are added in equal proportions, that is, when the content of each of Nb, Ta, and W is 0.5%, the alloy's room temperature tensile strength can reach over 1000 MPa.

[0033] 2. The method of the present invention can be used to prepare high-temperature titanium alloy ingots with uniform internal composition and high purity.

[0034] 3. Compared to vacuum consumable arc furnaces, the method described herein eliminates the need for electrode pressing and welding, thus preventing contamination of raw materials during this process. This method is particularly suitable for the smelting and preparation of high-performance alloy ingots, such as high-temperature titanium alloys. It has significant scientific research and production application value, and a broad market for aerospace products. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the vacuum magnetic levitation induction melting process for casting high-temperature titanium alloy in Example 1 of the present invention.

[0036] Figure 2 This is a metallographic photograph (500 times) of the TWBC cast high-temperature titanium alloy prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the embodiments and the accompanying drawings, but is not limited thereto.

[0038] Unless otherwise specified, the raw materials used in the embodiments of the present invention are simple elements and master alloys, wherein:

[0039] The elemental element refers to one or more of Zr (sponge zirconium particle size 3-25mm), Ta (TD-2 grade, 2-10mm thin slices), Y (metal yttrium block, 5-10mm), B (boron powder particle size 10-100μm), and C (carbon powder particle size 40-100nm);

[0040] The intermediate alloy refers to one or more of TiSn alloy (chip shape, tin content 80%), AlNb alloy (particle size 1-30mm, niobium content 62.1%), AlMo alloy (particle size 1-6mm, molybdenum content 60%), AlSi alloy (particle size 1-15mm, silicon content 10%), and AlW alloy (particle size 0.25-6mm, tungsten content 50%).

[0041] The above raw materials were used to prepare an ingot with a diameter of 100 mm and a weight of 15 kg, and smelted in a water-cooled copper crucible vacuum magnetic induction levitation melting furnace. The specific implementation is as follows:

[0042] Example 1:

[0043] To prepare TWBC high-temperature titanium alloy, the equipment uses a 15 kg water-cooled copper crucible vacuum magnetic induction levitation melting furnace. The steps of this method are as follows:

[0044] (1) Weighing

[0045] According to the composition range of TWBC high-temperature titanium alloy, a total of 15 kg of ingredients are prepared, titanium sponge, aluminum blocks, elemental elements and master alloys are weighed, and placed in different containers according to their types for later use;

[0046] The purity of titanium sponge is 0A grade, and the particle size is 0.84-12.7mm;

[0047] The mass fraction of pure aluminum in the aluminum block is not less than 99.99%.

[0048] (2) Furnace loading

[0049] Place the graphite mold in the pouring position of the furnace, turn over the water-cooled copper crucible to calibrate the position of the mold, and then put the raw materials mentioned in step (1) into the water-cooled copper crucible.

[0050] (3) After closing the furnace door, vacuum is drawn. The vacuum is drawn in the following manner:

[0051] Use a mechanical pump to pre-vacuum until the vacuum degree reaches below 1000Pa, and then turn on the Roots pump to pre-vacuum until the vacuum degree reaches 1×10 -1Pa, fill with argon to 5000Pa, repeat the above vacuuming and argon filling process 3 times, and finally fill with argon to 10000-20000Pa to prepare for smelting.

[0052] (4) Melting

[0053] During smelting, increase the power to 50kw and maintain it for 1 minute; increase the power to 100kw and maintain it for 1 minute; increase the power to 150kw and maintain it for 1 minute; increase the power to 200kw and maintain it until it is completely melted. If it cannot be completely melted at this power, increase the power to 250kw until all the raw materials are melted.

[0054] (5) Homogenization

[0055] After all the raw materials are melted, the alloy melt remains in a suspended or semi-suspended state under the action of the suspension force. The power is maintained at 200kw for 10 minutes, the power is reduced to 50kw, maintained for 1 minute, and then the power is increased to 200kw, maintained for 10 minutes. The above power reduction and power increase process is repeated 3 times. Through the action of electromagnetic stirring, the alloy composition can be made more uniform.

[0056] (6) After smelting, the alloy melt is poured into a graphite mold and cooled as follows:

[0057] Use a mechanical pump to pre-vacuum until the vacuum degree reaches below 1000Pa, and then turn on the Roots pump to pre-vacuum until the vacuum degree reaches 1×10 -1 Pa, keep the vacuum state, and cool to room temperature.

[0058] (7) After cooling to room temperature, the vacuum is broken and the furnace door is opened to take out the alloy ingot in the graphite mold to obtain the alloy ingot.

[0059] The chemical composition of titanium alloy is shown in Table 1, and the mechanical properties are shown in Table 2:

[0060] Table 1 Chemical composition of titanium alloy by weight

[0061] Serial number Al Sn Zr Si Nb Ta W B C Mo Y Ti 1 4.56 3.56 1.84 0.24 0.50 0.50 0.50 0.022 0.023 1.81 0.01 margin 2 4.80 3.80 2.00 0.30 0.50 0.50 0.50 0.030 0.030 2.21 0.02 margin 3 4.97 3.94 2.18 0.38 0.50 0.50 0.50 0.048 0.038 2.61 0.03 margin

[0062] Table 2 Mechanical properties of titanium alloy

[0063]

[0064] The chemical composition of the titanium alloy satisfies that the total content of Mo and Si is in the range of 2-3%, and the contents of Nb, Ta and W are added in equal proportions and are all 0.5%. The room temperature tensile strength of the alloy can reach more than 1000 MPa, and the tensile strength of the alloy at 600°C can reach more than 600 MPa.

[0065] Example 2:

[0066] To prepare TWBC high-temperature titanium alloy, the equipment uses a 15 kg water-cooled copper crucible vacuum magnetic induction levitation melting furnace. The steps of this method are as follows:

[0067] (1) Weighing

[0068] According to the composition range of TWBC high-temperature titanium alloy, a total of 15 kg of ingredients are prepared, titanium sponge, aluminum blocks, elemental elements and master alloys are weighed, and placed in different containers according to their types for later use;

[0069] The purity of titanium sponge is 0A grade, and the particle size is 0.84-12.7mm;

[0070] The mass fraction of pure aluminum in the aluminum block is not less than 99.99%.

[0071] (2) Furnace loading

[0072] Place the graphite mold in the pouring position of the furnace, turn over the water-cooled copper crucible to calibrate the position of the mold, and then put the raw materials mentioned in step (1) into the water-cooled copper crucible.

[0073] (3) After closing the furnace door, vacuum is drawn. The vacuum is drawn in the following manner:

[0074] Use a mechanical pump to pre-vacuum until the vacuum degree reaches below 1000Pa, and then turn on the Roots pump to pre-vacuum until the vacuum degree reaches 1×10 -1 Pa, fill with argon to 5000Pa, repeat the above vacuuming and argon filling process 3 times, and finally fill with argon to 10000-20000Pa to prepare for smelting.

[0075] (4) Melting

[0076] During smelting, increase the power to 50kw and maintain it for 1 minute; increase the power to 100kw and maintain it for 1 minute; increase the power to 150kw and maintain it for 1 minute; increase the power to 200kw and maintain it until it is completely melted. If it cannot be completely melted at this power, increase the power to 250kw until all the raw materials are melted.

[0077] (5) Homogenization

[0078] After all the raw materials are melted, the alloy melt remains in a suspended or semi-suspended state under the action of the suspension force. The power is maintained at 200kw for 10 minutes, the power is reduced to 50kw, maintained for 1 minute, and then the power is increased to 200kw, maintained for 10 minutes. The above power reduction and power increase process is repeated 3 times. Through the action of electromagnetic stirring, the alloy composition can be made more uniform.

[0079] (6) After smelting, the alloy melt is poured into a graphite mold and cooled as follows:

[0080] Use a mechanical pump to pre-vacuum until the vacuum degree reaches below 1000Pa, and then turn on the Roots pump to pre-vacuum until the vacuum degree reaches 1×10 -1 Pa, keep the vacuum state, and cool to room temperature.

[0081] (7) After cooling to room temperature, the vacuum is broken and the furnace door is opened to take out the alloy ingot in the graphite mold to obtain the alloy ingot.

[0082] The chemical composition of titanium alloy is shown in Table 3, and the mechanical properties are shown in Table 4:

[0083] Table 3 Chemical composition of titanium alloy wt.%

[0084] Serial number Al Sn Zr Si Nb Ta W B C Mo Y Ti 1 4.56 3.56 1.84 0.24 0.50 0.50 0.50 0.022 0.023 0.61 0.01 margin 2 4.56 3.56 1.84 0.24 0.38 0.40 0.45 0.022 0.023 1.81 0.01 margin 3 4.56 3.56 1.84 0.24 0.38 0.40 0.45 0.022 0.023 0.61 0.01 margin

[0085] Table 4 Mechanical properties of titanium alloy

[0086]

[0087] The chemical composition of the titanium alloy does not satisfy the total content of Mo and Si in the range of 2-3%, or does not satisfy the content of Nb, Ta, and W added in equal proportions and all of which are 0.5%, or does not satisfy the total content of Mo and Si in the range of 2-3%, and the content of Nb, Ta, and W added in equal proportions and all of which are 0.5%. In these three cases, the mechanical properties of the alloy are significantly reduced, the room temperature tensile strength fails to reach above 1000 MPa, and the 600°C tensile strength of the alloy fails to reach above 600 MPa.

[0088] Comparative Example:

[0089] To prepare TWBC high-temperature titanium alloy, the equipment uses a 15 kg water-cooled copper crucible vacuum magnetic induction levitation melting furnace. The steps of this method are as follows:

[0090] (1) Weighing

[0091] According to the composition range of TWBC high-temperature titanium alloy, a total of 15 kg of ingredients are prepared, titanium sponge, aluminum blocks, elemental elements and master alloys are weighed, and placed in different containers according to their types for later use;

[0092] The purity of titanium sponge is 0A grade, and the particle size is 0.84-12.7mm;

[0093] The mass fraction of pure aluminum in the aluminum block is not less than 99.99%.

[0094] (2) Furnace loading

[0095] Place the graphite mold in the pouring position of the furnace, turn over the water-cooled copper crucible to calibrate the position of the mold, and then put the raw materials mentioned in step (1) into the water-cooled copper crucible.

[0096] (3) After closing the furnace door, vacuum is drawn. The vacuum is drawn in the following manner:

[0097] Use a mechanical pump to pre-vacuum until the vacuum degree reaches below 1000Pa, and then turn on the Roots pump to pre-vacuum until the vacuum degree reaches 1×10 -1 Pa, fill with argon to 5000Pa, repeat the above vacuuming and argon filling process 3 times, and finally fill with argon to 10000-20000Pa to prepare for smelting.

[0098] (4) Melting

[0099] During smelting, increase the power to 50kw and maintain it for 1 minute; increase the power to 100kw and maintain it for 1 minute; increase the power to 150kw and maintain it for 1 minute; increase the power to 200kw and maintain it until it is completely melted. If it cannot be completely melted at this power, increase the power to 250kw until all the raw materials are melted.

[0100] (5) After smelting, the alloy melt is poured into a graphite mold and cooled as follows:

[0101] Use a mechanical pump to pre-vacuum until the vacuum degree reaches below 1000Pa, and then turn on the Roots pump to pre-vacuum until the vacuum degree reaches 1×10 -1 Pa, keep the vacuum state, and cool to room temperature.

[0102] (6) After cooling to room temperature, the vacuum is broken and the furnace door is opened to take out the alloy ingot in the graphite mold to obtain the alloy ingot.

[0103] The chemical composition of titanium alloy is shown in Table 5, and the mechanical properties are shown in Table 6:

[0104] Table 5 Chemical composition of titanium alloy wt.%

[0105] Serial number Al Sn Zr Si Nb Ta W B C Mo Y Ti 1 4.56 3.56 1.84 0.24 0.50 0.50 0.50 0.022 0.023 1.81 0.01 margin

[0106] Table 6 Mechanical properties of titanium alloy

[0107]

[0108] If homogenization treatment is not performed during the titanium alloy smelting process, the alloy composition is uneven and the mechanical properties of the alloy are significantly reduced.

[0109] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a high-temperature titanium alloy for casting at 600°C, characterized in that: The titanium alloy comprises the following components in weight percentage: Al 4.50-5.00%, Sn 3.50-4.00%, Zr 1.80-2.20%, Mo 0.50-3.00%, Si 0.20-0.40%, Nb 0.35-1.00%, Ta 0.35-1.00%, W 0.35-1.00%, Y 0-0.04%, B 0.020-0.050%, C 0.020-0.040%, and Ti as the balance; the specific steps are as follows: (1) Weighing According to the composition ratio of titanium alloy, titanium sponge, aluminum block, elemental elements and master alloy are weighed and placed in different containers according to their types for later use; (2) Furnace loading Place the graphite mold in the furnace pouring position, turn over the water-cooled copper crucible to calibrate the position of the mold, and then put the raw materials in step (1) into the water-cooled copper crucible; (3) After closing the furnace door, vacuum is drawn. The vacuum is drawn in the following manner: Use a mechanical pump to pre-vacuum until the vacuum degree reaches below 1000Pa, and then turn on the Roots pump to pre-vacuum until the vacuum degree reaches 1×10 - 1 Pa, fill with argon to 5000Pa, repeat the above vacuum and argon filling process 3 times, and finally fill with argon to 10000-20000Pa to prepare for smelting; (4) Melting During smelting, first increase the power to 50kw and keep it for 1 minute; increase the power to 100kw and keep it for 1 minute; increase the power to 150kw and keep it for 1 minute; increase the power to 200kw and keep it until it is completely melted. If it cannot be completely melted at this power, increase the power to 250kw until all the raw materials are melted; (5) Homogenization After all the raw materials are melted, the alloy melt is kept in a suspended or semi-suspended state under the action of the suspension force. The power is maintained at 200kw for 10 minutes, then the power is reduced to 50kw and maintained for 1 minute. The power is then increased to 200kw and maintained for 10 minutes. The above power reduction and increase process is repeated 3 times. Through the action of electromagnetic stirring, the alloy composition is made more uniform. (6) After smelting, the alloy melt is poured into a graphite mold and cooled as follows: Use a mechanical pump to pre-vacuum until the vacuum degree reaches below 1000Pa, and then turn on the Roots pump to pre-vacuum until the vacuum degree reaches 1×10 - 1 Pa below, keep vacuum state, and cool to room temperature; (7) After cooling to room temperature, the vacuum is broken and the furnace door is opened to take out the alloy ingot in the graphite mold to obtain the alloy ingot.

2. The method for preparing a high-temperature titanium alloy for casting at 600°C according to claim 1, characterized in that: The total content of Mo and Si is in the range of 2-3%.

3. The method for preparing a high-temperature titanium alloy for casting at 600°C according to claim 1, characterized in that: The contents of Nb, Ta and W are all 0.5%.

4. The method for preparing a high-temperature titanium alloy for casting at 600°C according to claim 1, characterized in that: In step (1), the purity of the titanium sponge is 0A grade and the particle size is 0.84-12.7 mm; The mass fraction of pure aluminum in the aluminum block is not less than 99.99%; The element is one or more of zirconium sponge with a particle size of 3-25 mm, TD-2 grade tantalum flakes with a size of 2-10 mm, yttrium metal blocks with a size of 5-10 mm, boron powder with a particle size of 10-100 μm, and carbon powder with a particle size of 40-100 nm; The master alloy refers to one or more of TiSn alloy, AlNb alloy, AlMo alloy, AlSi alloy, and AlW alloy.

5. The method for preparing a high-temperature titanium alloy for casting at 600°C according to claim 4, characterized in that: The TiSn alloy is in the form of chips with a tin content of 80%, the AlNb alloy has a particle size of 1-30 mm and a niobium content of 62.1%, the AlMo alloy has a particle size of 1-6 mm and a molybdenum content of 60%, the AlSi alloy has a particle size of 1-15 mm and a silicon content of 10%, and the AlW alloy has a particle size of 0.25-6 mm and a tungsten content of 50%.

6. A Ti-Al-Sn-Zr-Mo-Si-Nb-Ta-WBCY based cast high temperature titanium alloy prepared according to the method of any one of claims 4 to 5, characterized in that: The room temperature properties of the cast high-temperature titanium alloy are: tensile strength ≥1000MPa, yield strength ≥904MPa, elongation ≥8.0%; the high temperature properties at 600°C are: tensile strength ≥605MPa, yield strength ≥484MPa, elongation ≥15.0%.

7. An application of the Ti-Al-Sn-Zr-Mo-Si-Nb-Ta-WBCY based cast high temperature titanium alloy according to claim 6, characterized in that: The method is used to prepare blades of aircraft engines, aircraft engine accessory casings, flame shields of UAV engines or air inlets which are important structural components of supersonic aircraft engines.

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