Intermediate alloy for titanium alloy smelting and preparation method thereof

Abstract

The invention relates to the field of titanium alloy preparation, and discloses an intermediate alloy for titanium alloy smelting and a preparation method thereof. The method comprises the following steps: weighing raw materials corresponding to alloy elements according to a set mass ratio, wherein the alloy elements comprise Al, V and three elements selected from the following elements: Fe, Zr, Sn, Mo, Cr, Nb and Si; the weighed raw materials are mixed and alloyed through wet ball milling, and ball milling slurry is obtained; drying the obtained slurry to obtain alloy powder; the alloy powder and titanium-based powder are mixed, vacuum hot pressing sintering is adopted, and a sintered block is obtained; and cutting the sintered block to obtain the intermediate alloy for titanium alloy smelting. According to the method, the intermediate alloy is prepared through mechanical alloying (ball milling method) and vacuum hot pressing sintering, fluoride residues cannot be generated, compared with an aluminothermy method, the method is more environmentally friendly, the nitrogen content of the alloy is low, and formation of a titanium alloy carbonitride brittle phase can be reduced.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy processing, and more specifically to an intermediate alloy for titanium alloy smelting and its preparation method. Background Technology

[0002] Titanium alloys possess numerous superior properties, including low density, high specific strength, excellent corrosion resistance, and superior processing performance. In the aerospace field, titanium alloys are frequently used to manufacture aircraft engine components and fuselage structural parts, significantly reducing aircraft weight and improving flight performance and fuel economy. In shipbuilding, their excellent resistance to seawater corrosion makes them an ideal material for manufacturing critical components such as pressure hulls and propulsion systems. In the automotive industry, titanium alloys can be used to manufacture high-performance parts such as engine valves and connecting rods, enhancing vehicle power performance and reliability.

[0003] In titanium alloys, alloying elements are usually added in the form of master alloys. As the core raw material for titanium alloy smelting, master alloys can solve the problems of large melting point differences, element segregation and impurity control caused by the direct addition of high melting point elements (such as Mo, Nb, V, etc.).

[0004] Currently, the main technologies for preparing master alloys for titanium alloys are aluminothermic reduction and vacuum arc melting. The aluminothermic reduction method uses aluminum as a reducing agent to synthesize low-melting-point master alloys through an aluminothermic reaction. For example, patent CN107586955A discloses a quaternary master alloy for titanium alloy preparation and its preparation method. This method uses a metallothermic reduction method, with aluminum as the reducing agent, molybdenum trioxide, niobium pentoxide, and zirconium dioxide as oxidants, and calcium fluoride as a slagging agent. However, the aluminothermic reduction method for preparing master alloys for titanium alloys has two drawbacks: 1) Insufficient impurity control: the nitrogen content in traditional aluminothermic methods is generally >0.02% (200~300ppm), which easily leads to the formation of brittle carbonitride phases in titanium alloys; 2) High environmental pressure: the fluorine-containing waste residue (CaF2) generated by the reaction has high treatment costs and requires supporting hazardous waste disposal facilities. The vacuum arc melting method uses electron beam bombardment to remove impurities and prepare high-purity master alloys. Its advantage lies in precise impurity control, meeting aerospace-grade material standards, but its disadvantages lie in high equipment investment and complex processes.

[0005] Overall, there is still room for improvement in the existing methods for preparing intermediate alloys for titanium alloy smelting. Summary of the Invention

[0006] In view of the above-mentioned problems in the prior art, the main objective of the present invention is to provide an intermediate alloy for titanium alloy smelting and a method for preparing the same.

[0007] According to one aspect of the present invention, a method for preparing a master alloy for titanium alloy smelting is provided, the method comprising the following steps: Weigh the raw materials corresponding to each alloying element according to the set mass ratio. The alloying elements include Al, V and three elements selected from the following elements: Fe, Zr, Sn, Mo, Cr, Nb, and Si. The weighed raw materials are mixed and alloyed by wet ball milling to obtain ball mill slurry; The resulting slurry was dried to obtain alloy powder; The alloy powder is mixed with titanium-based powder and sintered by vacuum hot pressing to obtain a sintered block; The sintered block is chipped to obtain the intermediate alloy for titanium alloy smelting.

[0008] According to one embodiment of the present invention, the ball-to-material mass ratio of the wet ball mill is 8:1 to 20:1, the ball milling time is more than 24 hours, and the ball milling speed is 200 to 450 r / min.

[0009] According to one embodiment of the present invention, the ball milling medium in the wet ball mill is cyclohexane, and the amount of cyclohexane added is 1.5 to 3 times the total mass of the raw materials.

[0010] According to one embodiment of the present invention, before performing the wet ball milling, the raw material and the ball milling media are ultrasonically dispersed for more than 0.5 hours.

[0011] According to one embodiment of the present invention, the mass ratio of the alloy powder to the titanium-based powder is 1:2~5.

[0012] According to one embodiment of the present invention, the vacuum hot pressing sintering pressure is 80~130MPa, the temperature is 1100~1300℃, and the holding time is 1~3h.

[0013] According to one embodiment of the present invention, the vacuum hot pressing sintering is performed under an inert protective atmosphere.

[0014] According to one embodiment of the present invention, after vacuum hot pressing sintering, the sintered block is cooled to below 100°C in the furnace.

[0015] According to another aspect of the present invention, a master alloy for titanium alloy smelting is provided, which is prepared by the method described in any of the above embodiments.

[0016] According to one embodiment of the present invention, the intermediate alloy comprises the following components by mass percentage: Al: 10.0%~55.0%; V: 10.0%~30.0%; three elements selected from the following elements: Fe, Zr, Sn, Mo, Cr, Nb, Si, accounting for a total of 8%~40%; and the balance Ti.

[0017] Compared with the prior art, the master alloy for titanium alloy smelting of the present invention and its preparation method have at least one of the following beneficial effects: (1) The method of the present invention uses mechanical alloying (ball milling) and vacuum hot pressing sintering to prepare master alloys, which will not produce fluoride residues, is more environmentally friendly than the aluminothermic method, and has low nitrogen content, which reduces the formation of brittle carbonitride phases in titanium alloys; (2) The mechanical alloying method is used to prepare pentagonal master alloys, which avoids the high-temperature volatilization defects (such as loss of Al and Sn elements) of traditional vacuum smelting process, and controls the uniformity of element ratio by wet ball milling, which is especially suitable for element combinations with large melting point differences (such as Al and Mo, Zr); (3) The method of the present invention has low equipment requirements and is easy to implement. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A flowchart of a method for preparing a master alloy for titanium alloy smelting according to an embodiment of the present invention is shown; Figure 2 A photograph is shown of a chip-like alloy containing Al-V-Cr-Mo-Sn prepared according to Example 1 of the present invention; Figure 3 A photograph of a Ti551 titanium alloy ingot prepared according to Example 2 of the present invention is shown; Figure 4 A photograph of a TB9 titanium alloy ingot prepared according to Example 5 of the present invention is shown. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] It should be understood that the embodiments of the invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in this invention, those skilled in the art will readily recognize that various modifications are possible without substantially departing from the teachings of the invention. Accordingly, all such modifications should be included within the scope of the invention. Other substitutions, modifications, variations, and deletions can be made to the design, operating conditions, and parameters of the following exemplary embodiments without departing from the spirit of the invention.

[0023] According to one aspect of the present invention, a method for preparing a master alloy for titanium alloy smelting is provided. For example... Figure 1 As shown, the method mainly includes the following steps: Step S1: Weigh the raw materials corresponding to each alloying element according to the set mass ratio. The alloying elements include Al, V and three elements selected from the following elements: Fe, Zr, Sn, Mo, Cr, Nb, and Si. Step S2: The weighed raw materials are mixed and alloyed by wet ball milling to obtain ball mill slurry; Step S3: Dry the obtained slurry to obtain alloy powder; Step S4: Mix the alloy powder with the titanium-based powder and sinter by vacuum hot pressing to obtain a sintered block; Step S5: Cut the sintered block into chips to obtain an intermediate alloy for titanium alloy smelting.

[0024] The method of this invention uses mechanical alloying (ball milling) and vacuum hot pressing sintering to prepare pentagonal master alloys. It does not produce fluoride residues, is more environmentally friendly than the aluminothermic method, and has a low nitrogen content, reducing the formation of brittle carbonitride phases in titanium alloys. The mechanical alloying method avoids the high-temperature volatilization defects (such as loss of Al and Sn elements) of traditional vacuum melting processes. The element ratio uniformity is controlled by wet ball milling, which is especially suitable for element combinations with large melting point differences (such as Al with Mo and Zr). The method of this invention has low equipment requirements and is easy to implement.

[0025] The following describes in detail, by way of example, each step of the method for preparing the intermediate alloy for titanium alloy smelting according to the present invention.

[0026] In step S1, raw materials corresponding to each alloying element are weighed according to a set mass ratio. The alloying elements include the main elements Al and V, as well as three elements selected from the following elements: Fe, Zr, Sn, Mo, Cr, Nb, and Si.

[0027] In some embodiments of the present invention, the purity of each element in the raw materials is ≥99.9% to ensure that the final intermediate alloy has high purity and reduce the adverse effects of impurities on the performance of the titanium alloy. Simultaneously, precise control of the proportions of each raw material ensures the stability of the intermediate alloy composition, thereby improving the quality of titanium alloy smelting and product stability.

[0028] In some embodiments of the present invention, the five elements are selected from any combination of the following: (a) Al, V, Zr, Mo, Cr; (b) Al, V, Cr, Nb, Sn; (c) Al, V, Zr, Mo, Si; (d) Al, V, Fe, Cr, Zr. Al has a large difference in melting point compared to elements such as Mo and Zr. When using other smelting methods to prepare intermediate alloys containing Al, Mo, and Zr simultaneously, problems such as severe element segregation and uneven composition are prone to occur. The present invention effectively solves this problem by using wet ball milling, which allows the elements to be fully mixed and undergo alloying reactions during the ball milling process, ensuring the uniformity and stability of the intermediate alloy composition.

[0029] In step S2, the weighed raw materials are mixed and alloyed by wet ball milling to obtain ball mill slurry.

[0030] In wet ball milling, parameters such as the ball-to-material mass ratio, milling time, and milling speed have a significant impact on the milling effect. In some embodiments of this invention, the ball-to-material mass ratio is controlled at 8:1 to 20:1, further at 10:1 to 18:1, and even further at 12:1 to 15:1; the milling time is controlled at more than 24 hours, and the milling speed is 200 to 450 r / min, further at 250 to 400 r / min, and even further at 300 to 350 r / min. Under these conditions, the raw materials can be fully mixed and alloyed to obtain high-quality milled slurry. The mill jar and grinding balls are both made of zirconium oxide to ensure the chemical inertness and purity of the entire milling system. Zirconia has high hardness and excellent wear resistance, which can effectively prevent the introduction of impurities such as iron and nickel due to wear between the grinding balls and the jar during intense grinding. Zirconia's excellent corrosion resistance also ensures that it can coexist stably with the ball milling media without reacting, thus preventing the oxidation and contamination of highly active elements in the ball milling media and raw materials.

[0031] In some embodiments of the present invention, the ball milling medium for wet ball milling is cyclohexane, and the amount of cyclohexane added is 1.5 to 3 times the total mass of the raw material, and more specifically 1.5 to 2 times. Cyclohexane has good solubility and dispersibility, enabling the raw material to be better dispersed and mixed during ball milling, while not introducing other impurities, thus ensuring the purity of the intermediate alloy. Cyclohexane is an inert organic solvent, free of water and oxygen. Using cyclohexane can isolate the powder from air, preventing oxidation of the powder during prolonged ball milling and maintaining the purity of the alloy powder. After ball milling, the powder and cyclohexane can be separated by simple filtration. Since cyclohexane has a low boiling point, trace amounts of solvent remaining in the powder can be easily removed by vacuum drying at a low temperature. Compared with more commonly used media (such as alcohol, acetone, water, or toluene), cyclohexane performs better in preventing material oxidation.

[0032] Optionally, before wet ball milling, the raw materials and ball milling media can be ultrasonically dispersed for more than 0.5 hours to further promote the dispersion of the raw materials, improve the ball milling efficiency and quality, and make the slurry after ball milling more uniform and delicate.

[0033] In step S3, the obtained slurry is dried to obtain alloy powder.

[0034] Specifically, after ball milling, the slurry can be dried until the residual solvent mass is ≤0.5%. The resulting powder has a particle size distribution D50 of 10~50μm, an oxygen content of ≤0.10%, and a microhardness of ≥300HV.

[0035] In step S4, the alloy powder and titanium-based powder are mixed and sintered by vacuum hot pressing to obtain a sintered block.

[0036] In some embodiments of the present invention, alloy powder and titanium-based powder are mixed at a mass ratio of 1:2 to 5, and then vacuum hot-pressed for sintering. Specifically, the titanium-based powder can be titanium powder with a purity of 99.9% or higher. The vacuum hot-pressing pressure is 80 to 130 MPa, further 100 to 130 MPa, and even further 110 to 130 MPa; the temperature is 1100 to 1300°C, further 1150 to 1250°C, and even further 1200 to 1250°C; the holding time is 1 to 3 hours, and the process is carried out under an inert protective atmosphere. Under these sintering conditions, the alloy powder and titanium-based powder can fully react and densify, forming a high-quality sintered block. Through hot-pressing sintering, under solid or semi-solid conditions far below the metal melting point, high temperature and pressure can be used to promote interdiffusion between alloying elements and titanium, thereby forming a uniform, alloyed, dense block. This process can eliminate density differences and volatility issues between powders, simplify subsequent smelting operations, and enable the intermediate alloy to melt quickly and uniformly and integrate into the titanium melt, thereby improving the compositional uniformity and process stability of the final titanium alloy ingot.

[0037] Optionally, in some embodiments of the present invention, after vacuum hot pressing sintering, the sintered block is cooled to below 100°C in the furnace before being removed from the furnace.

[0038] In step S5, the sintered block is chipped to obtain an intermediate alloy for titanium alloy smelting.

[0039] Specifically, a lathe can be used to cut the sintered bulk material into chips. This mechanical cutting process significantly increases the specific surface area of ​​the intermediate alloy. When smelting titanium alloys, the chips falling into the molten pool can be quickly encapsulated and melted by the liquid titanium, accelerating the mass and heat transfer rates. This ensures that various alloying elements can dissolve rapidly and synchronously into the molten titanium, thereby obtaining a highly uniform microstructure and a stable and reliable chemical composition in the final titanium alloy ingot.

[0040] According to another aspect of the present invention, a master alloy for smelting titanium alloys is also provided, which is prepared by means of the method described in any of the above embodiments.

[0041] Furthermore, the intermediate alloy may include the following components by mass percentage: Al: 10.0%~55.0%; V: 10.0%~30.0%; three elements selected from the following elements: Fe, Zr, Sn, Mo, Cr, Nb, Si, accounting for a total of 8%~40%; and the balance Ti, with the sum of all elements being 100%.

[0042] In one embodiment of the present invention, the intermediate alloy comprises Al-V-Cr-Mo-Sn, wherein Al: 30.0%~55.0%; V: 10.0%~30.0%; Cr: 5.0%~15.0%; Mo: 5.0%~20.0%; Sn: 0.5%~10.0%, with the balance being Ti, and the sum of all elements is 100%.

[0043] In one embodiment of the present invention, the intermediate alloy comprises Al-V-Zr-Cr-Mo, wherein Al: 10.0%~25.0%; V: 20.0%~35.0%; Zr: 20.0%~25.0%; Cr: 10.0%~18.0%; Mo: 10.0%~16.0%, with the balance being Ti, and the sum of all elements being 100%.

[0044] The method of the present invention will be further described and illustrated below with reference to embodiments.

[0045] Example 1 This embodiment is used to prepare an Al-V-Cr-Mo-Sn master alloy for smelting Ti551 titanium alloy. The specific steps are as follows: (1) Use Al, V, Cr, Mo and Sn powders with a purity of 99.9% and the mass ratio of each element is 10.0% V, 55.0% Al, 10.0% Cr, 15.0% Mo and 10.0% Sn. Weigh each raw material powder according to this mass ratio.

[0046] (2) The powder was prepared by wet ball milling. The ball milling tank and grinding balls were made of zirconium oxide, and the ball milling medium was cyclohexane. The ball-to-material mass ratio was 15:1, the ball milling time was 48h, and the ball milling speed was 350r / min. The amount of cyclohexane added to the ball milling medium was 2.5 times the total mass of the powder. Before the ball milling started, the powder was mixed with cyclohexane and ultrasonically dispersed for 1h.

[0047] (3) After filtering the ball-milled slurry, place it in a vacuum drying oven and dry the slurry until the residual solvent mass is ≤0.5%. After sieving, a uniform alloy powder with a particle size ≤800μm is obtained.

[0048] (4) Mix the alloy powder and titanium powder at a mass ratio of 1:3.5, and perform vacuum hot pressing sintering under inert gas protection. The pressure is 100MPa, the temperature is 1300℃, and the holding time is 2h.

[0049] (5) After sintering, the sintered block is cooled to below 100°C in the furnace and taken out. The sintered block is then chipped using a lathe to obtain the intermediate alloy.

[0050] Figure 2 A photograph is shown of a chip-like alloy comprising Al-V-Cr-Mo-Sn prepared according to Example 1 of the present invention. The specific composition of the alloy is shown in Table 1 below: Table 1. Results of intermediate alloy composition analysis (mass percentage %)

[0051] Example 2 This embodiment uses the master alloy prepared in Example 1 to prepare Ti551 titanium alloy. The specific steps are as follows: sponge titanium and shavings of master alloy are mixed and laid out at a mass ratio of 4:5, followed by electrode pressing and welding, and a VAR melting process to prepare Ti551 titanium alloy. The VAR melting includes three VAR melting processes, with the first ingot having a diameter of Φ190mm and the second ingot having a diameter of Φ250mm. The finished ingot size is φ300mm. 450mm. The target composition of Ti551 titanium alloy is Ti-5.3Al-1.5Mo-1.0V-1.0Sn-1.0Cr-0.1O-0.15Fe. The resulting triple VAR casting ingot is as follows: Figure 3 As shown.

[0052] Example 3 This embodiment is used to prepare an Al-V-Cr-Mo-Sn master alloy for titanium alloy smelting. The specific steps are as follows: (1) Use Al, V, Cr, Mo and Sn powders with a purity of 99.9% and the mass ratio of each element is 20.0% V, 45.0% Al, 10.0% Cr, 20.0% Mo and 5.0% Sn. Weigh each raw material powder according to this mass ratio.

[0053] (2) The powder was prepared by wet ball milling. The ball milling tank and grinding balls were made of zirconium oxide, and the ball milling medium was cyclohexane. The ball-to-material mass ratio was 8:1, the ball milling time was 36h, and the ball milling speed was 450r / min. The amount of cyclohexane added to the ball milling medium was 1.5 times the total mass of the powder. Before the ball milling started, the powder was mixed with cyclohexane and ultrasonically dispersed for 1.5h.

[0054] (3) After filtering the ball-milled slurry, place it in a vacuum drying oven and dry the slurry until the residual solvent mass is ≤0.5%. After sieving, a uniform alloy powder with a particle size ≤800μm is obtained.

[0055] (4) Mix the alloy powder and titanium powder at a mass ratio of 1:5, and perform vacuum hot pressing sintering under inert gas protection. The pressure is 80MPa, the temperature is 1200℃, and the holding time is 2h.

[0056] (5) After sintering, the sintered block is cooled to below 100°C in the furnace and taken out. The sintered block is then chipped using a lathe to obtain the intermediate alloy.

[0057] The specific composition of the alloy is shown in Table 2 below: Table 2. Results of intermediate alloy composition analysis (mass percentage %)

[0058] Example 4 This embodiment is used to prepare an Al-V-Cr-Mo-Zr master alloy for TB9 titanium alloy smelting. The specific steps are as follows: (1) Use Al, V, Cr, Mo and Sn powders with a purity of 99.9% and the mass ratio of each element is 32.0% V, 12.0% Al, 24.0% Cr, 16.0% Mo and 16.0% Zr. Weigh each raw material powder according to this mass ratio.

[0059] (2) The powder was prepared by wet ball milling. The ball milling tank and grinding balls were made of zirconium oxide and the ball milling medium was cyclohexane. The ball-to-material mass ratio was 20:1, the ball milling time was 72h, and the ball milling speed was 250r / min. The amount of cyclohexane added to the ball milling medium was 3 times the total mass of the powder. Before the ball milling started, the powder was mixed with cyclohexane and ultrasonically dispersed for 2h.

[0060] (3) After filtering the ball-milled slurry, place it in a vacuum drying oven and dry the slurry until the residual solvent mass is ≤0.5%. After sieving, a uniform alloy powder with a particle size ≤800μm is obtained.

[0061] (4) Mix the alloy powder and titanium powder at a mass ratio of 1:2 and perform vacuum hot pressing sintering under inert gas protection. The pressure is 130 MPa, the temperature is 1100 °C, and the holding time is 1 h.

[0062] (5) After sintering, the sintered block is cooled to below 100°C in the furnace and taken out. The sintered block is then chipped using a lathe to obtain the intermediate alloy.

[0063] The specific composition of the alloy is shown in Table 3 below: Table 3. Results of intermediate alloy composition analysis (mass percentage %)

[0064] Example 5 This embodiment uses the master alloy prepared in Example 4 to prepare TB9 titanium alloy. The specific steps are as follows: sponge titanium and shavings of master alloy are mixed and laid out at a mass ratio of 3:1, followed by electrode pressing, welding, and VAR melting to prepare TB9 titanium alloy. The VAR melting includes three VAR melting processes, with the first ingot having a diameter of Φ190mm and the second ingot having a diameter of Φ250mm. The finished ingot size is φ300mm. 450mm. The target composition of TB9 titanium alloy is Ti-3.0Al-8.0V-6.0Cr-4.0Mo-4.0Zr.

[0065] The prepared TB9 titanium alloy ingot, as Figure 4 As shown in Table 4, the component detection results are as follows: Table 4. Composition test results of TB9 titanium alloy ingot (mass percentage %)

[0066] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of the present invention is limited to these examples; within the framework of the embodiments of the present invention, the technical features of the above embodiments or different embodiments can also be combined, and there are many other variations of different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of the present invention should be included within the protection scope of the embodiments of the present invention.

Claims

1. A method for preparing a master alloy for titanium alloy smelting, characterized in that, Includes the following steps: Weigh the raw materials corresponding to each alloying element according to the set mass ratio. The alloying elements include Al, V and three elements selected from the following elements: Fe, Zr, Sn, Mo, Cr, Nb, and Si. The weighed raw materials are mixed and alloyed by wet ball milling to obtain ball mill slurry; The resulting slurry was dried to obtain alloy powder; The alloy powder is mixed with titanium-based powder and sintered by vacuum hot pressing to obtain a sintered block; The sintered block is chipped to obtain the intermediate alloy for titanium alloy smelting.

2. The method for preparing the master alloy for titanium alloy smelting according to claim 1, characterized in that, The wet ball mill has a ball-to-material mass ratio of 8:1 to 20:1, a milling time of more than 24 hours, and a milling speed of 200 to 450 r / min.

3. The method for preparing the master alloy for titanium alloy smelting according to claim 1, characterized in that, The ball milling medium in the wet ball mill is cyclohexane, and the amount of cyclohexane added is 1.5 to 3 times the total mass of the raw materials.

4. The method for preparing the master alloy for titanium alloy smelting according to claim 3, characterized in that, Before performing the wet ball milling, the raw material and the ball milling media are ultrasonically dispersed for at least 0.5 hours.

5. The method for preparing the master alloy for titanium alloy smelting according to claim 1, characterized in that, The mass ratio of the alloy powder to the titanium-based powder is 1:2~5.

6. The method for preparing the master alloy for titanium alloy smelting according to claim 1, characterized in that, The vacuum hot pressing sintering pressure is 80~130MPa, the temperature is 1100~1300℃, and the holding time is 1~3h.

7. The method for preparing the master alloy for titanium alloy smelting according to claim 1, characterized in that, The vacuum hot pressing sintering is carried out under an inert protective atmosphere.

8. The method for preparing the master alloy for titanium alloy smelting according to claim 1, characterized in that, After vacuum hot pressing sintering, the sintered block is cooled to below 100°C in the furnace.

9. A master alloy for smelting titanium alloys, characterized in that, It is prepared by the method according to any one of claims 1-8.

10. The master alloy for titanium alloy smelting according to claim 9, characterized in that, The intermediate alloy comprises the following components by mass percentage: Al: 10.0%~55.0%; V: 10.0%~30.0%; selected from three elements selected from the following elements: Fe, Zr, Sn, Mo, Cr, Nb, Si, accounting for a total of 8%~40%; and the balance Ti.

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