A high-performance titanium alloy and a preparation method thereof

Abstract

The application provides a high-performance titanium alloy and a preparation method thereof, wherein the high-performance titanium alloy meets the following requirements: V: 3.6-4.5%, Al: 4-4.9%, Y: 0.15-0.35%, Eu: 0.25-0.45%, Nb: 1-2%, Sn: 1.5-2.6%, and Ti: the balance. The preparation method of the high-performance titanium alloy is used for manufacturing the high-performance titanium alloy and comprises the following steps: charging, loading alloy materials containing V, Al, Y, Eu, Nb, Sn and Ti into a water-cooled copper crucible of a vacuum suspension melting furnace according to the above weight percentage; starting melting, melting all the loaded titanium alloy raw materials, then stepwise increasing the melting power, keeping suspension at a higher suspension melting power than the starting power for refining, and then stepwise reducing the melting power; and discharging, cooling and solidifying the alloy melt containing the above elements in the crucible or casting the alloy melt into an ingot. The application can keep stable performance and resist oxidation and aging under high-temperature super-normal conditions.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of titanium alloys and preparation methods thereof, and particularly relates to a titanium alloy capable of maintaining stable performance and resisting oxidation and aging under high-temperature super-normal conditions and a preparation method thereof. BACKGROUND

[0002] At present, titanium alloys are rapidly developed into a new generation of key structural forming materials due to low density, high specific strength, excellent corrosion resistance, oxidation resistance and other characteristics, and are widely applied to the field of aerospace.

[0003] In recent years, the development and research of key components of space launch vehicles in China have put forward higher requirements for the mechanical properties of titanium alloys. Under high-temperature super-normal service conditions, titanium alloy materials may have problems such as performance out of control and premature oxidation and aging, so that the quality of titanium alloy materials cannot be further improved, thereby limiting the development of the space industry.

[0004] Titanium alloy performance out of control under high-temperature environment includes strength reduction, thermal stress concentration and creep failure. When titanium alloy is above its phase transition temperature (such as the beta transition temperature of alpha + beta titanium alloy), the grain will grow rapidly, resulting in a significant reduction in strength and hardness, and even plastic deformation, which cannot maintain structural stability. Under high temperature, the material expands unevenly, and if there is a temperature gradient in the component design or use scene, thermal stress is easy to produce, which may cause crack propagation, especially in the welding or complex structure part. When titanium alloy is in high temperature (such as more than 0.3-0.4 times the melting point) for a long time, it will creep, that is, the plastic deformation accumulates slowly, and finally leads to the size of the component exceeding the allowable range or breaking.

[0005] The oxidation and aging mechanism of titanium alloy under high-temperature environment includes oxidation layer formation, element diffusion and embrittlement, and thermal cycle damage. Titanium reacts with oxygen to form a TiO2 oxidation layer at high temperature. Although the initial oxidation layer can block the penetration of oxygen to a certain extent, when the temperature is too high (such as more than 600 DEG C), the oxidation layer may become loose and porous, lose its protective effect, and even peel off from the matrix due to thermal expansion and contraction, accelerating oxidation. Oxygen diffuses into the titanium alloy and forms an interstitial solid solution with titanium, causing lattice distortion and increasing the brittleness of the material; at the same time, alloying elements (such as aluminum and vanadium) in the alloy may be preferentially consumed or unevenly distributed during oxidation, disrupting the original alloy performance balance and exacerbating "aging". Repeated high-temperature-low-temperature cycles will produce fatigue stress between the oxidation layer and the matrix, accelerating the peeling of the oxidation layer, and the internal microcracks will expand due to thermal fatigue, further reducing the performance of the material.

[0006] The countermeasures in the prior art include surface coating protection: such as aluminizing, coating ceramic coating (such as Al2O3), blocking oxygen from contacting the titanium alloy, which increases the cost and reduces the work efficiency. Alloy composition optimization: adding antioxidant elements (such as silicon and yttrium) to improve high-temperature oxidation resistance and strength retention rate, and there is no suitable alloy composition that can meet the corresponding technical requirements, and the preparation of the alloy is also very difficult, and the performance of the obtained alloy is unstable. Temperature control: avoiding long-term use in an environment exceeding the design tolerance temperature, or maintaining a reasonable working temperature through a cooling system, in fact, this method is not easy to implement and has poor practicability.

[0007] Therefore, how to maintain stable performance and resist oxidation and aging under high-temperature super-normal conditions is a problem that needs to be solved in the high-performance titanium alloy industry. SUMMARY

[0008] One of the main purposes of the present application is to overcome at least one of the above-mentioned defects of the prior art, and to provide a high-performance titanium alloy and a preparation method thereof, which can maintain stable performance and resist oxidation and aging under high-temperature super-normal conditions.

[0009] To achieve the above-mentioned purposes of the present application, the present application adopts the following technical solutions:

[0010] According to one aspect of the present application, a high-performance titanium alloy is provided, and the weight percentage of each constituent element in the high-performance titanium alloy meets the following requirements:

[0011] V: 3.6-4.5%, Al: 4-4.9%, Y: 0.15-0.35%, Eu: 0.25-0.45%, Nb: 1-2%, Sn: 1.5-2.6%, Ti: balance.

[0012] According to one specific embodiment of the present application, the weight percentage of each constituent element meets the following requirements:

[0013] V: 3.8-4.4%, Al: 4.1-4.7%, Y: 0.2-0.3%, Eu: 0.3-0.4%, Nb: 1.2-1.6%, Sn: 1.9-2.5%, Ti: balance.

[0014] According to one specific embodiment of the present application, the weight percentage of each constituent element meets the following requirements:

[0015] V: 4.0%, Al: 4.5%, Y: 0.24%, Eu: 0.36%, Nb: 1.4%, Sn: 2.1%, Ti: balance.

[0016] According to one specific embodiment of the present application, if the content of V is x% and the content of Al is y%, then x+y=8.5.

[0017] According to a specific embodiment of the present invention, let the Y content be α%, the Eu content be β%, and the Nb content be γ%, then: α+β=0.6; and 1.7≤α+β+γ≤2.5.

[0018] According to another aspect of the present invention, a method for preparing a high-performance titanium alloy is provided, comprising the following steps:

[0019] Step 1: Loading. The alloy material containing V, Al, Y, Eu, Nb, Sn, and Ti is loaded into the water-cooled copper crucible of the vacuum suspension casting furnace according to the above weight percentages.

[0020] Step 2: Initial melting, so that all the loaded titanium alloy raw materials are melted, then the melting power is increased step by step. When the suspending melting power is higher than the initial power, the suspension is maintained for refining. Then the melting power is reduced step by step. The whole process is repeated 3 times.

[0021] Step 3: Discharge the material. The alloy melt containing the above elements is cooled and solidified in a crucible or cast into an ingot.

[0022] According to a specific embodiment of the present invention, in step one, the pressure inside the melting chamber is evacuated to 1×10⁻⁶ using a vacuum system. -3 ~1×10 -2 Pa, then high-purity argon gas (99.999% purity) is introduced to make the pressure inside the melting chamber 3 × 10 Pa. 4 ~4×10 4 Pa.

[0023] According to a specific embodiment of the present invention, in step two, an initial power of 10~400kW is used to completely melt the loaded titanium alloy raw material.

[0024] According to a specific embodiment of the present invention, in step two, after reaching the predetermined power, the device is suspended for 10 seconds before being adjusted to the next higher power.

[0025] According to a specific embodiment of the present invention, in step two, when the suspension melting power is higher than the initial power, the refining is carried out by maintaining suspension for 0 to 10 minutes.

[0026] As can be seen from the above technical solution, the advantages and positive effects of the high-performance titanium alloy and its preparation method of the present invention are as follows:

[0027] The titanium alloy produced by this invention maintains stable performance and resists oxidation and aging under extreme high-temperature conditions. The method for preparing this high-performance titanium alloy has practical applications in engineering production, and can bring considerable economic and social benefits. Attached Figure Description

[0028] Figure 1 This is a SEM image of the tensile fracture surface of the high-performance alloy prepared in Example 1 of the present invention. Detailed Implementation

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0030] The key technology of the high-performance titanium alloy of the present invention is that each of its constituent elements and their respective weight percentages meet the following requirements: V: 3.6~4.5%, Al: 4~4.9%, Y: 0.15~0.35%, Eu: 0.25~0.45%, Nb: 1~2%, Sn: 1.5~2.6%, Ti: balance.

[0031] Further preferred technical requirements are: each of its constituent elements and their respective weight percentages meet the following requirements: V: 3.8~4.4%, Al: 4.1~4.7%, Y: 0.2~0.3%, Eu: 0.3~0.4%, Nb: 1.2~1.6%, Sn: 1.9~2.5%, Ti: balance. The V element content was referenced from that in ZTC4 titanium alloy. The Nb element content was determined primarily through accumulated experimental data. An Nb content of 1.2%–1.6% improves the ductility and toughness of the titanium alloy. However, when the Nb content is between 2% and 10%, the alloy's performance does not show a significant improvement. When the Nb content exceeds 10%, the overall melting difficulty of the alloy increases, leading to decreased overall fluidity and increased porosity. A small amount of Y effectively improves the strength and ductility of the titanium alloy, acting as a grain boundary strengthenr and effectively deoxidizing it internally. Excessive Y content leads to segregation and reduces the mechanical properties of the titanium alloy. Based on accumulated experimental data, a Y content of 0.2–0.3% is found to be suitable, and the addition of Y effectively suppresses the porosity caused by Nb. Eu can purify grain boundaries, refine grains, improve toughness, resist deformation, and remove oxygen to some extent. Based on accumulated experimental data, an Eu content of 0.3–0.4% is found to be suitable, improving corrosion resistance and oxidation resistance to some extent while suppressing porosity. Sn is a neutral element. Adding an appropriate amount of Sn can improve strength and hardness, and to some extent improve the creep resistance of the alloy.

[0032] Further preferred technical requirements are that each constituent element and its respective percentage by weight satisfy the following requirements: V: 4.0%, Al: 4.5%, Y: 0.24%, Eu: 0.36%, Nb: 1.4%, Sn: 2.1%, Ti: balance.

[0033] The preferred defined technical content requirement is that the V content is x %, the Al content is y %, and the ratio requirement of x + y =8.5 is met; the V element is a beta phase stabilizing element, which mainly improves the plasticity of the titanium alloy, but reduces the strength of the titanium alloy. The Al element is an alpha phase stabilizing element, which mainly improves the strength of the titanium alloy at room temperature and high temperature, but reduces the plasticity of the titanium alloy. The ratio of the two elements within a certain content range can comprehensively strengthen their effects, and it can be known through the accumulation of experimental data that when the ratio requirement of x + y =8.5 is met, the strength and plasticity of the titanium alloy can be effectively matched.

[0034] The Y content is α %, the Eu content is beta%, and the Nb content is gamma%, and the ratio requirement of α+ β=0.6 and 1.7≤ α+ β+γ≤2.5 is met; although the addition of the Nb element can improve the plasticity and toughness of the titanium alloy, it will reduce the flowability of the alloy, thereby causing the alloy ingot to produce alloy pores and reducing the mechanical properties of the alloy, and the addition of the Y and Eu elements can purify the grain boundary, refine the grain, and improve the flowability of the alloy, thereby inhibiting the generation of alloy pores. The ratio of the two elements within a certain content range can comprehensively strengthen their effects, and it can be known through the accumulation of experimental data that when the ratio requirement of α+ β=0.6 and 1.7≤ α+ β+γ≤2.5 is met, the comprehensive performance of the titanium alloy can be effectively improved.

[0035] The preparation method of the high-performance titanium alloy disclosed in the application, and the technical key is that each step and content is in turn:

[0036] Step 1: charging.

[0037] The alloy material containing V, Al, Y, Eu, Nb, Sn and Ti elements is charged into the water-cooled copper crucible of the vacuum suspension melting furnace according to the above weight percentage, the pressure in the melting chamber is extracted to 1x10 -3 ~1x10 -2 Pa by using a vacuum system, then high-purity argon with a purity of 99.999% is filled to make the pressure in the melting chamber 3x10 4 ~4x10 4 Pa.

[0038] The pressure in the smelting chamber is extracted to 1x10 -3 ~1x10 -2 Pa. The method can effectively remove O and other impurity elements in the chamber. In addition, the highest vacuum degree that can be achieved by the currently available vacuum equipment in the application background of the method is generally 1x10 - 3 Pa. The higher the purity of argon gas, the weaker the effect of the atmosphere on the purity of the titanium alloy. Through experimental comparison, it is found that the smelting effect of 6N-grade and 5N-grade argon gas is similar. Considering the cost of raw materials, 5N-grade high-purity argon gas is finally selected. The pressure in the smelting chamber is 3x10 4 ~4x10 4 Pa, which can effectively ensure the purity of the atmosphere in the chamber and avoid the dangerous zones of diffusion arc and edge arc during smelting. Literature references: CN200910071773-Method for reducing oxygen content in TI6AL4V alloy by non-consumable arc smelting in hydrogen-argon mixed atmosphere, CN201710398763-Method for purifying substances by suspension smelting.

[0039] Step 2: Start smelting.

[0040] Adjust the power, use the starting power of 10-400 kW to melt all the loaded titanium alloy raw materials, and then increase the smelting power in steps, that is, after reaching the predetermined power, suspend for 10 s and then adjust to the next higher power.

[0041] Keep suspending for 0-10 min when reaching the smelting power higher than the starting power to refine;

[0042] Then decrease the smelting power in steps, that is, after reaching the predetermined power, suspend for 10 s and then adjust to the next lower power.

[0043] Repeat the whole process for 3 times, that is, first increase the smelting power in steps, then decrease the smelting power in steps, then increase the smelting power in steps again, decrease the smelting power in steps again, and then increase the smelting power in steps again and decrease the smelting power in steps again, a total of 3 times.

[0044] The refining process can ensure the uniformity of the smelting of the titanium alloy material. The theoretical basis of the stepwise increase / decrease of power is that different smelting powers can make the alloy smelt in different temperature ranges, and the diffusion coefficient of alloy elements is most closely related to the smelting temperature. Different smelting powers change the diffusion rates of different elements, making the mutual smelting of elements more thorough and sufficient, thereby ensuring the uniformity of the smelting of the titanium alloy material.

[0045] Step 3, discharging.

[0046] The alloy melt containing the above elements is cooled and solidified in a crucible or cast into an ingot, so that the high-performance titanium alloy material can be obtained, and the technical effect is excellent.

[0047] According to an embodiment of the present application, in step 2, the starting power is 350 kW, and the suspension smelting power is 550 kW. We deduce the empirical formula of the Eu and Y element addition amount-suspension smelting refining deoxidization amount of the high-performance titanium alloy by analyzing the relationship between the titanium alloy deoxidization and the Eu and Y element addition and the suspension smelting refining process in the suspension smelting process:

[0048] ;

[0049] wherein z is the oxygen content removed by the high-performance TC4 alloy, ψ is the Y element deoxidization correction coefficient, x is the Y element content added, θ is the Eu element deoxidization correction coefficient, y is the Eu element content added, and β is the suspension smelting refining deoxidization amount correction coefficient.

[0050] wherein, under the condition that the starting power is 350 kW and the suspension smelting power is 550 kW and the suspension smelting time is 10 min, ψ in the formula is 0.2672, θ is 0.1531, and β is 0.0005, that is:

[0051] .

[0052] The present application has the advantages that: the high-performance titanium alloy provided by the present application has low smelting difficulty and can be prepared by vacuum suspension smelting, and the process is simple, the parameter setting is simple, and the process is easy to control. The special step-up / down power suspension smelting process has a better effect on the uniformity of the titanium alloy smelting, and the specific component ratio brings better strength, plasticity and other mechanical property effects to the titanium alloy while controlling the cost. The present application has application significance for engineering production and can bring considerable economic and social benefits. Example 1

[0053] A high-performance titanium alloy and a preparation method thereof mainly include the following steps:

[0054] Batching and charging:

[0055] The high-performance titanium alloy is composed of V element 4.0%, Al element 4.5%, Y element 0.24%, Eu element 0.36%, Nb element 1.4%, Sn element 2.1%, and Ti element as the balance.

[0056] According to the above ratio, each material is loaded into the water-cooled copper crucible of the vacuum suspension smelting furnace, the pressure in the smelting chamber is extracted to 1x10 -3 ~1x10 -2Pa, and then high-purity argon gas (purity 99.999%) is filled to make the pressure inside the smelting chamber 3x10 4 ~4x10 4 Pa.

[0057] Start smelting, adjust power

[0058] The above titanium alloy material is completely melted using a power of 350 kW, and then the smelting power is stepped up (i.e., after reaching a predetermined power for 10 s, the power is adjusted to the next power), and when the smelting power reaches 550 kW, the smelting is kept for 10 min for refining, and then the smelting power is stepped down, and the whole process is repeated for 3 times. The refining process can ensure the uniformity of the smelting of the titanium alloy material.

[0059] 3. The alloy melt containing the above elements is cooled and solidified in the crucible or cast into an ingot, and a high-performance titanium alloy material is obtained. The performance comparison of the prepared high-performance titanium alloy and TC4 titanium alloy is shown in Table 1. The high-performance titanium alloy is superior to the TC4 titanium alloy in yield strength, room temperature elongation, and high-temperature elongation performance. The room temperature tensile strength is close to the upper limit value of the TC4 titanium alloy, but the creep limit and oxidation limit are far superior to the TC4 titanium alloy. Overall, the high-performance titanium alloy is superior to the TC4 titanium alloy in comprehensive performance.

[0060] Table 1 Performance comparison of high-performance titanium alloy of the present application and TC4 titanium alloy

[0061]

[0062] The SEM image of the tensile fracture of the high-performance alloy prepared in Example 1 is shown in Figure 1 . Example 2

[0063] The main content of this embodiment is basically the same as that of Example 1, and in particular, the difference between this embodiment and Example 1 is that:

[0064] The alloy material containing titanium, vanadium, aluminum, yttrium, europium, niobium, and tin is proportioned by weight percentage as follows: V element 3.6%, Al element 4.9%, Y element 0.15%, Eu element 0.45%, Nb element 1%, Sn element 1.5%, and Ti element is the balance. The other steps and parameters are the same as those in the first embodiment. The performance of the prepared high-performance titanium alloy is shown in Table 2. Example 3

[0065] The main content of this embodiment is basically the same as that of Example 1, and in particular, the difference between this embodiment and Example 1 is that:

[0066] The alloy material containing titanium, vanadium, aluminum, yttrium, europium, niobium and tin elements is proportioned by weight percentage of V element 4.5%, Al element 4%, Y element 0.35%, Eu element 0.25%, Nb element 2%, Sn element 2.6%, and Ti element as the balance. Other steps and parameters are the same as those in the first embodiment. The performance of the prepared high-performance titanium alloy is shown in Table 2. Example 4

[0067] The alloy material containing titanium, vanadium, aluminum, yttrium, europium, niobium and tin elements is proportioned by weight percentage of V element 4.5%, Al element 4%, Y element 0.35%, Eu element 0.25%, Nb element 2%, Sn element 2.6%, and Ti element as the balance. Other steps and parameters are the same as those in the first embodiment. The performance of the prepared high-performance titanium alloy is shown in Table 2. Example 5

[0068] The main content of the embodiment is basically the same as that of Example 1, and in particular, the embodiment is different from Example 1 in that:

[0069] The alloy material containing titanium, vanadium, aluminum, yttrium, europium, niobium and tin elements is proportioned by weight percentage of V element 4.5%, Al element 4%, Y element 0.35%, Eu element 0.25%, Nb element 2%, Sn element 2.6%, and Ti element as the balance. Other steps and parameters are the same as those in the first embodiment. The performance of the prepared high-performance titanium alloy is shown in Table 2.

[0070] Table 2 Comparison of performances of titanium alloys in various embodiments of the application

[0071] Example 6

[0072] The main content of the embodiment is basically the same as that of Example 1, and in particular, the embodiment is different from Example 1 in that:

[0073] The alloy material containing titanium, vanadium, aluminum, yttrium, europium, niobium and tin elements is proportioned by weight percentage of V element 4.5%, Al element 4%, Y element 0.35%, Eu element 0.25%, Nb element 2%, Sn element 2.6%, and Ti element as the balance. Other steps and parameters are the same as those in the first embodiment. The performance of the prepared high-performance titanium alloy is shown in Table 2. Example 7

[0074] The main content of the embodiment is basically the same as that of Example 1, and in particular, the embodiment is different from Example 1 in that:

[0075] The alloy material containing titanium, vanadium, aluminum, yttrium, europium, niobium and tin elements is proportioned by weight percentage of V element 4.0%, Al element 4.5%, Y element 0.15%, Eu element 0.36%, Nb element 1.4%, Sn element 2.1%, and Ti element as the balance. Other steps and parameters are the same as those in the first embodiment. The performance of the prepared high-performance titanium alloy is shown in Table 3. Example 8

[0076] The main content of the embodiment is basically the same as that of Example 1, and in particular, the embodiment is different from Example 1 in that:

[0077] The alloy material containing titanium, vanadium, aluminum, yttrium, europium, niobium and tin elements is proportioned by weight percentage of V element 4.0%, Al element 4.5%, Y element 0.15%, Eu element 0.36%, Nb element 1.4%, Sn element 2.1%, and Ti element as the balance. Other steps and parameters are the same as those in the first embodiment. The performance of the prepared high-performance titanium alloy is shown in Table 3. Example 9

[0078] The main content of the embodiment is basically the same as that of Example 1, and in particular, the embodiment is different from Example 1 in that:

[0079] The alloy material containing titanium, vanadium, aluminum, yttrium, europium, niobium and tin elements is proportioned by weight percentage of V element 4.0%, Al element 4.5%, Y element 0.15%, Eu element 0.36%, Nb element 1.4%, Sn element 2.1%, and Ti element as the balance. Other steps and parameters are the same as those in the first embodiment. The performance of the prepared high-performance titanium alloy is shown in Table 3.

[0080] Table 3 Performance comparison of titanium alloys prepared in Examples 1, 6, 7, 8 and 9 of the present application

[0081]

[0082] Those skilled in the art should understand that the specific structures and processes shown in the foregoing detailed embodiment part are only exemplary and not limiting. Moreover, those skilled in the art can combine the various technical features shown above in various possible manners to form new technical solutions or make other modifications, and all of them are within the scope of the present application.

Claims

1. A high-performance titanium alloy, characterized in that, The constituent elements of the high-performance titanium alloy and their respective weight percentages meet the following requirements: V: 3.6~4.5%, Al: 4~4.9%, Y: 0.15~0.35%, Eu: 0.25~0.45%, Nb: 1~2%, Sn: 1.5~2.6%, Ti: balance; The preparation of the high-performance titanium alloy includes the following steps: Step 1: Loading. The alloy material containing V, Al, Y, Eu, Nb, Sn, and Ti is loaded into the water-cooled copper crucible of the vacuum suspension casting furnace according to the above weight percentages. Step 2: Initial melting. Use an initial power of 10~400kW to melt all the loaded titanium alloy raw materials. Then, increase the melting power step by step. After reaching the predetermined power, suspend for 10 seconds and then adjust to the next higher power. When the suspending melting power is higher than the initial power, keep it suspended for refining. Then, decrease the melting power step by step. Repeat the whole process 3 times. Step 3: Discharge the material. The alloy melt containing the above elements is cooled and solidified in a crucible or cast into an ingot.

2. The high-performance titanium alloy according to claim 1, characterized in that: Each constituent element and its respective weight percentage must meet the following requirements: V: 3.8~4.4%, Al: 4.1~4.7%, Y: 0.2~0.3%, Eu: 0.3~0.4%, Nb: 1.2~1.6%, Sn: 1.9~2.5%, Ti: balance.

3. The high-performance titanium alloy according to claim 2, characterized in that: Each constituent element and its respective weight percentage must meet the following requirements: V: 4.0%, Al: 4.5%, Y: 0.24%, Eu: 0.36%, Nb: 1.4%, Sn: 2.1%, Ti: balance.

4. The high-performance titanium alloy according to any one of claims 1-3, characterized in that: Let the V content be x% and the Al content be y%, then x + y = 8.

5.

5. The high-performance titanium alloy according to claim 4, characterized in that: Let the Y content be α%, the Eu content be β%, and the Nb content be γ%, then: α + β = 0.6; and 1.7 ≤ α + β + γ ≤ 2.

5.

6. The high-performance titanium alloy according to claim 1, characterized in that: In step one, the pressure inside the melting chamber is evacuated to 1×10 using a vacuum system. -3 ~1×10 -2 Pa, then high-purity argon gas (99.999% purity) is introduced to make the pressure inside the melting chamber 3 × 10 Pa. 4 ~4×10 4 Pa.

7. The high-performance titanium alloy according to claim 6, characterized in that: In step two, when the suspension melting power is higher than the initial power, the refining is carried out by maintaining suspension for 0 to 10 minutes.

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