Method for improving creep properties of manganese-containing titanium aluminum alloys and manganese-containing titanium aluminum alloys

Abstract

The application discloses a method for improving the creep performance of a manganese-containing titanium-aluminum alloy and the manganese-containing titanium-aluminum alloy, and belongs to the technical field of the manganese-containing titanium-aluminum alloy. The application overcomes the problem that the beta to alpha transformation cannot completely occur in the high-temperature and cooling process of the alloy due to the addition of the manganese element, and the residual beta phase is orderly transformed into beta o (B2) phase during further cooling, thereby damaging the high-temperature creep performance of the alloy, and realizes the improvement of the high-temperature creep performance of the alloy on the basis of the hot working deformation of the alloy without a can. o The application provides an effective scheme for solving the bottleneck problem of the creep performance of the manganese-containing titanium-aluminum alloy caused by the residual beta (B2) phase, and meanwhile, the good formability of the manganese-containing titanium-aluminum alloy in the hot working without a can is maintained, and the engineering application prospect of the low-cost high-performance manganese-containing titanium-aluminum alloy in the field of aviation and aerospace is effectively promoted.

Description

Technical Field

[0001] This invention relates to the field of manganese-containing titanium-aluminum alloy technology, and in particular to a method for improving the creep properties of manganese-containing titanium-aluminum alloys and manganese-containing titanium-aluminum alloys. Background Technology

[0002] TiAl alloys are characterized by their light weight, high specific strength, and good oxidation resistance, playing a crucial role in the development of strategic fields such as aviation, aerospace, and low-altitude economy in my country. Among them, manganese-containing TiAl alloys have become an important development direction for low-cost TiAl alloys in recent years due to their combination of good hot deformability and low material cost.

[0003] Currently, relevant fields have confirmed that some manganese-containing TiAl alloys can be hot-forged and hot-rolled like traditional materials such as steel without cladding. A key reason for the excellent hot deformation capability of these alloys is the extremely strong β-stabilizing effect of Mn. However, this also brings new problems. To ensure a wider hot working window for TiAl alloys, it is often necessary to add higher contents of Mn or other strong β-stabilizing elements. However, the addition of Mn and other elements inevitably leads to the incomplete β→α transformation during high-temperature cooling of the alloy. The remaining β phase becomes ordered into β during further cooling. o (B2) Phase. Studies have confirmed that the residual βo phase has an adverse effect on the mechanical properties of the alloy, especially impairing its high-temperature creep performance. Therefore, how to further improve the high-temperature creep performance of TiAl alloys while ensuring that they can achieve low-cost, unencapsulated hot deformation is a key aspect in realizing the engineering applications of this type of low-cost, easily deformable manganese-containing TiAl alloy. Summary of the Invention

[0004] The main objective of this invention is to provide a method for improving the creep properties of manganese-containing titanium-aluminum alloys and a manganese-containing titanium-aluminum alloy, thereby solving the technical problem of poor high-temperature creep resistance of manganese-containing titanium-aluminum alloys.

[0005] To achieve the above objectives, the present invention provides a method for improving the creep properties of manganese-containing titanium-aluminum alloys, wherein the chemical composition of the manganese-containing titanium-aluminum alloy, calculated by molar percentage of atoms, comprises: Ti + 40.0at .%~48.0at .% Al + 1.0at .%~5.0at .% Mn + 0.2at .%~2.0at .% Mo + 0.1at .%~2.0at .% W + 0.1at .%~1.0at .% Ta; The method for improving the creep properties of manganese-containing titanium-aluminum alloys includes the following steps: Select titanium-containing raw materials, aluminum-containing raw materials, manganese-containing raw materials, molybdenum-containing raw materials, tungsten-containing raw materials, and tantalum-containing raw materials according to the chemical composition of the manganese-titanium-aluminum alloy; The selected raw materials are mixed and smelted to obtain alloy materials; The alloy material is forged to obtain a forging alloy; The forging alloy is subjected to post-forging heat treatment, primary cooling, aging treatment, and secondary cooling to obtain a manganese-containing titanium-aluminum alloy.

[0006] In some embodiments of the present invention, the chemical composition of the manganese-titanium-aluminum alloy, calculated according to the molar percentage of atoms, further includes: 0.05 at .%~0.15 at .% of B and 0.05 at .%~0.15 at .% of C. In the step of mixing and melting the selected raw materials, the alloy material is further obtained by mixing and melting boron-containing raw materials and carbon-containing raw materials.

[0007] In some embodiments of the present invention, the titanium-containing raw material includes sponge titanium; The titanium-containing raw material includes pure aluminum metal; The aluminum-containing raw material includes an aluminum-molybdenum master alloy; The manganese-containing raw material includes pure manganese metal; The molybdenum-containing raw material includes an aluminum-molybdenum master alloy; The tungsten-containing raw material includes an aluminum-tungsten master alloy; The tantalum-containing raw material includes tantalum powder; The boron-containing raw material includes TiB2 powder; The carbon-containing raw material includes graphite.

[0008] In some embodiments of the present invention, the temperature of the post-forging heat treatment is 1260℃~1290℃, and the time of the post-forging heat treatment is 0.4h~0.6h.

[0009] In some embodiments of the present invention, the temperature of the primary cooling is 25°C to 30°C.

[0010] In some embodiments of the present invention, the aging treatment temperature is 830℃~880℃, and the aging treatment time is 2.5h~3.5h.

[0011] In some embodiments of the present invention, the primary cooling is performed by air cooling; and / or, the secondary cooling is performed by furnace cooling.

[0012] The present invention also provides a manganese-containing titanium-aluminum alloy, which is prepared by the method described above for improving the creep properties of manganese-containing titanium-aluminum alloys.

[0013] In some embodiments of the present invention, the chemical composition of the manganese-titanium-aluminum alloy, calculated by molar percentage of atoms, includes: Ti + 44.0 at.% Al + 3.1 at.% Mn + 0.35 at.% Mo + 0.38 at.% W + 0.45 at.% Ta + 0.09 at.% B + 0.11 at.% C.

[0014] The present invention also provides an application of the manganese-containing titanium-aluminum alloy described above in the aerospace field.

[0015] The beneficial effects that this invention can achieve are: This invention prepares manganese-titanium-aluminum alloys by introducing trace amounts of Ta element through alloying. This overcomes the problem of incomplete β→α transformation during high-temperature and cooling processes caused by the addition of manganese. The residual β phase is orderly transformed into β during further cooling. o The (B2) phase, which impairs the high-temperature creep performance of the alloy, was addressed by improving the high-temperature creep performance of the alloy while performing hot working deformation without a casing.

[0016] This invention addresses the problem of residual β in manganese-containing titanium-aluminum alloys. o This provides an effective solution to the creep performance bottleneck caused by the (B2) phase, while maintaining the good formability of the manganese-containing titanium-aluminum alloy without cladding hot working, which strongly promotes the engineering application prospects of this type of low-cost, high-performance manganese-containing titanium-aluminum alloy in the aerospace field. Attached Figure Description

[0017] 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 the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a characterization diagram of the manganese-titanium-aluminum alloy of Embodiment 1 of the present invention; Figure 2 This is a characterization diagram of the manganese-containing titanium-aluminum alloy of Comparative Example 1 of the present invention; Figure 3 The graph shows the performance comparison results between Embodiment 1 and Comparative Example 1 of the present invention.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Currently, relevant fields have confirmed that some manganese-containing TiAl alloys can be hot-forged and hot-rolled like traditional materials such as steel without cladding. A key reason for the excellent hot deformation capability of these alloys is the extremely strong β-stabilizing effect of Mn. However, this also brings new problems. To ensure a wider hot working window for TiAl alloys, it is often necessary to add higher contents of Mn or other strong β-stabilizing elements. However, the addition of Mn and other elements inevitably leads to the incomplete β→α transformation during high-temperature cooling of the alloy. The remaining β phase becomes ordered into β during further cooling. o (B2) phase. Studies have confirmed that the remaining β phase... o The interaction between the phases can adversely affect the mechanical properties of the alloy, especially its high-temperature creep performance. Therefore, improving the high-temperature creep performance of TiAl alloys while ensuring that they can be hot-deformed without cladding at a low cost is a key aspect in realizing the engineering applications of these low-cost, easily deformable manganese-containing TiAl alloys.

[0024] In view of this, the present invention provides a method for improving the creep properties of manganese-containing titanium-aluminum alloys, wherein the chemical composition of the manganese-containing titanium-aluminum alloy, calculated by molar percentage of atoms, includes: Ti + 40.0 at. %~48.0 at. % of Al + 1.0 at. %~5.0 at. % of Mn + 0.2 at. %~2.0 at. % of Mo + 0.1 at. %~2.0 at. % of W + 0.1 at. %~1.0 at. % of Ta; The method for improving the creep properties of manganese-containing titanium-aluminum alloys includes the following steps: S10. Select titanium-containing raw materials, aluminum-containing raw materials, manganese-containing raw materials, molybdenum-containing raw materials, tungsten-containing raw materials, and tantalum-containing raw materials according to the chemical composition of manganese-titanium-aluminum alloys; S20. Mix and smelt the selected raw materials to obtain an alloy material; S30 alloy material is forged to obtain forging alloy; S40 forging alloy is obtained by post-forging heat treatment, primary cooling, aging treatment, and secondary cooling to obtain manganese-containing titanium-aluminum alloy.

[0025] This invention prepares manganese-titanium-aluminum alloys by introducing trace amounts of Ta element through alloying. This overcomes the problem of incomplete β→α transformation during high-temperature and cooling processes caused by the addition of manganese. The residual β phase is orderly transformed into β during further cooling. o The (B2) phase, which impairs the high-temperature creep performance of the alloy, was addressed by improving the high-temperature creep performance of the alloy while performing hot working deformation without a casing.

[0026] This invention addresses the problem of residual β in manganese-containing titanium-aluminum alloys. o This provides an effective solution to the creep performance bottleneck caused by the (B2) phase, while maintaining the good formability of the manganese-containing titanium-aluminum alloy without cladding hot working, which strongly promotes the engineering application prospects of this type of low-cost, high-performance manganese-containing titanium-aluminum alloy in the aerospace field.

[0027] In some embodiments, the chemical composition of the manganese-titanium-aluminum alloy, calculated by molar percentage of atoms, further includes: 0.05 at .% to 0.15 at .% of B and 0.05 at .% to 0.15 at .% of C. The steps of mixing and smelting the selected raw materials also include mixing and smelting boron-containing raw materials and carbon-containing raw materials to obtain the alloy material.

[0028] In some embodiments, the titanium-containing material includes sponge titanium.

[0029] In some embodiments, the titanium-containing raw material includes pure aluminum metal.

[0030] In some embodiments, the aluminum-containing raw material includes an aluminum-molybdenum master alloy.

[0031] In some embodiments, the manganese-containing raw material includes pure manganese metal.

[0032] In some embodiments, the molybdenum-containing raw material includes an aluminum-molybdenum master alloy.

[0033] In some embodiments, the tungsten-containing raw material includes an aluminum-tungsten master alloy.

[0034] In some embodiments, the tantalum-containing raw material includes tantalum powder.

[0035] In some embodiments, the boron-containing raw material includes TiB2 powder.

[0036] In some embodiments, the carbon-containing raw material includes graphite.

[0037] In some embodiments, a vacuum induction melting furnace is used for melting.

[0038] In this invention, the alloy material obtained by smelting is forged, which can break up the coarse grains in the cast state, densify the structure and initially form a deformed structure, laying the foundation for obtaining a high-performance uniform full-lamellar structure in subsequent heat treatment.

[0039] In some embodiments, during the forging process, a forging press is used to upset or draw the alloy material to obtain a forging alloy.

[0040] In some embodiments, a YMG27-100 model 100T forging press is used to upset or draw the alloy material to obtain a forging alloy.

[0041] In some embodiments, the forging temperature range is 1150°C to 1350°C.

[0042] In some embodiments, the forging time is 1 hour to 3 hours.

[0043] In some embodiments, the initial heating temperature for forging is 1350°C, and the holding time is 0.4h to 0.5h.

[0044] In some embodiments, the temperature in the middle section of forging is controlled at 1150℃~1200℃, and the holding time is 20min~30min.

[0045] In step S30, post-forging heat treatment can eliminate forging deformation structures, achieve compositional homogenization, and provide conditions for subsequent cooling transformation to obtain a fully lamellar structure. Primary cooling promotes the transformation of the alloy into a fine, fully lamellar agglomerate structure, while aging treatment and secondary cooling further stabilize the alloy structure. Step S30 of this invention, through post-forging heat treatment, primary cooling, aging treatment, and secondary cooling, treats the forged alloy, which is beneficial for obtaining a manganese-titanium-aluminum alloy with uniform composition and stable structure.

[0046] In some embodiments, the temperature of the post-forging heat treatment is 1260℃~1290℃, which can be 1270℃, and the time of the post-forging heat treatment is 0.4h~0.6h, which can be 0.5h.

[0047] In some embodiments, the temperature of the first cooling is 25°C to 30°C, i.e., cooling to room temperature.

[0048] In some embodiments, sequential cooling is performed using air cooling (AC).

[0049] In some embodiments, the aging treatment temperature is 830°C to 880°C, or 850°C, and the aging treatment time is 2.5h to 3.5h, or 3h. Aging treatment at the above relatively low temperatures can further stabilize the alloy structure.

[0050] In some embodiments, the secondary cooling temperature is 25°C to 30°C, i.e., cooling to room temperature, to further stabilize the alloy microstructure.

[0051] In some embodiments, secondary cooling is performed using furnace cooling (FC), which allows for a slow cooling rate through the medium and low temperature range, minimizing internal stress caused by excessively rapid cooling, preventing workpiece cracking, and stabilizing the microstructure.

[0052] This invention provides a manganese-containing titanium-aluminum alloy, prepared by the above-described method for improving the creep properties of manganese-containing titanium-aluminum alloys. The chemical composition of the manganese-containing titanium-aluminum alloy, calculated by molar percentage of atoms, includes: Ti + 40.0at .% ~ 48.0at .% Al + 1.0at .% ~ 5.0at .% Mn + 0.2at .% ~ 2.0at .% Mo + 0.1at .% ~ 2.0at .% W + 0.1at .% ~ 1.0at .% Ta.

[0053] It is understandable that Ti + 40.0at .%~48.0at .% Al + 1.0at .%~5.0at .% Mn + 0.2at .%~2.0at .% Mo + 0.1at .%~2.0at .% W + 0.1at .%~1.0at .% Ta refers to the presence of 40.0at .%~48.0at .% Al, 1.0at .%~5.0at .% Mn, 0.2at .%~2.0at .% Mo, 0.1at .%~2.0at .% W, and 0.1at .%~1.0at .% Ta in the manganese-titanium-aluminum alloy, with the balance being Ti.

[0054] The Al content in manganese-titanium-aluminum alloys can be 40.0 at .%, 41.0 at .%, 42.0 at .%, 43.0 at .%, 44.0 at .%, 45.0 at .%, 46.0 at .%, 47.0 at .%, 48.0 at .%, etc.

[0055] The Mn content in manganese-titanium-aluminum alloys can be 1.0at .%, 1.2at .%, 1.5at .%, 1.8at .%, 2.0at .%, 2.5at .%, 3.0at .%, 3.5at .%, 4.0at .%, 4.5at .%, 5.0at .%, etc.

[0056] The Mo content in manganese-titanium-aluminum alloys can be 0.2at.%, 0.3at.%, 0.5at.%, 0.8at.%, 1.0at.%, 1.2at.%, 1.5at.%, 1.8at.%, 1.9at.%, 2.0at.%, etc.

[0057] The W content in manganese-titanium-aluminum alloys can be 0.1at.%, 0.2at.%, 0.5at.%, 0.8at.%, 1.0at.%, 1.2at.%, 1.5at.%, 1.8at.%, 2.0at.%, etc.

[0058] The Ta content in manganese-titanium-aluminum alloys can be 0.1at.%, 0.2at.%, 0.3at.%, 0.4at.%, 0.5at.%, 0.6at.%, 0.7at.%, 0.8at.%, 0.9at.%, 1.0at.%, etc.

[0059] Where Ti represents titanium, Al represents aluminum, Mn represents manganese, Mo represents molybdenum, W represents tungsten, and Ta represents tantalum.

[0060] This invention introduces trace amounts of Ta (ta) for alloying to obtain manganese-containing titanium-aluminum alloys, significantly improving their high-temperature creep properties and achieving a fundamental shift from brittle creep fracture to ductile creep behavior. This change significantly improves the material's damage tolerance and reliability during high-temperature service, addressing the issue of residual β in manganese-containing titanium-aluminum alloys. o This provides an effective solution to the creep performance bottleneck caused by the / B2 phase, while maintaining the good formability of manganese-containing titanium-aluminum alloys in uncoated hot working, which strongly promotes the engineering application prospects of this type of low-cost, high-performance manganese-containing titanium-aluminum alloy in the aerospace field.

[0061] In some embodiments, the chemical composition of the manganese-titanium-aluminum alloy, calculated by molar percentage of atoms, further includes: 0.05 at .% to 0.15 at .% of B and 0.05 at .% to 0.15 at .% of C. B is boron, and C is carbon.

[0062] In some embodiments, the chemical composition of the manganese-titanium-aluminum alloy, calculated by molar percentage of atoms, includes: Ti + 44.0 at.% Al + 3.1 at.% Mn + 0.35 at.% Mo + 0.38 at.% W + 0.45 at.% Ta + 0.09 at.% B + 0.11 at.% C.

[0063] The manganese-containing titanium-aluminum alloy obtained by the method of improving the creep properties of manganese-containing titanium-aluminum alloy according to the present invention has excellent creep resistance and is suitable for the aerospace field.

[0064] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0065] Example 1 S10. Calculated by molar percentage of atoms, the chemical composition of the manganese-titanium-aluminum alloy includes: Ti + 44.0 at .% Al + 3.1 at .% Mn + 0.35 at .% Mo + 0.38 at .% W + 0.45 at .% Ta + 0.09 at .% B + 0.11 at .% C. S20. According to the above chemical composition of manganese-titanium-aluminum alloy, sponge titanium, industrial pure aluminum, purified manganese, aluminum-molybdenum master alloy, aluminum-tungsten master alloy, tantalum powder, TiB2 powder and graphite are placed in a vacuum induction melting furnace for melting to obtain 2.5 kg of alloy material.

[0066] S30: The alloy material is upsetting or drawing multiple times using a YMG27-100 100T forging press to prepare a 30mm×30mm forging alloy. The initial heating temperature for forging is 1350℃.

[0067] S40. The forging alloy is subjected to a high-temperature treatment at 1270℃ for 0.5 hours after forging. After the treatment, it is air-cooled (AC) to room temperature of 25℃~30℃. Then, it is aged at 850℃ for 3 hours. After aging, it is cooled to room temperature of 25℃~30℃ by furnace cooling (FC) to obtain a manganese-titanium-aluminum alloy.

[0068] Example 2 Example 2 prepared a manganese-titanium-aluminum alloy according to the method of Example 1, except that the chemical composition of the manganese-titanium-aluminum alloy included: Ti + 48.0 at .% Al + 4.1 at .% Mn + 0.35 at .% Mo + 0.38 at .% W + 0.45 at .% Ta + 0.09 at .% B + 0.11 at .% C.

[0069] Example 3 Example 3 describes the preparation of a manganese-titanium-aluminum alloy using the same method as in Example 1, except that the chemical composition of the manganese-titanium-aluminum alloy includes: Ti + 44.0 at .% Al + 3.1 at .% Mn + 0.35 at .% Mo + 0.38 at .% W + 0.30 at .% Ta + 0.09 at .% B + 0.11 at .% C.

[0070] Example 4 Example 4 describes the preparation of a manganese-titanium-aluminum alloy using the same method as in Example 1, except that the chemical composition of the manganese-titanium-aluminum alloy includes: Ti + 44.0 at .% Al + 3.1 at .% Mn + 0.35 at .% Mo + 0.38 at .% W + 0.20 at .% Ta + 0.09 at .% B + 0.11 at .% C.

[0071] Example 5 Example 5 describes the preparation of a manganese-titanium-aluminum alloy using the same method as in Example 1, except that the chemical composition of the manganese-titanium-aluminum alloy includes: Ti + 44.0 at .% Al + 3.1 at .% Mn + 0.35 at .% Mo + 0.38 at .% W + 0.70 at .% Ta + 0.09 at .% B + 0.11 at .% C.

[0072] Comparative Example 1 The manganese-containing titanium-aluminum alloy in Comparative Example 1 does not contain Ta. The preparation method of the manganese-containing titanium-aluminum alloy is as follows: S10. According to the molar percentage of atoms, the chemical composition of the manganese-titanium-aluminum alloy includes: Ti + 44.0at .% Al + 3.1at .% Mn + 0.35at .% Mo + 0.38at .% W + 0.09at .% B + 0.11at .% C.

[0073] S20. According to the above chemical composition of manganese-titanium-aluminum alloy, sponge titanium, industrial pure aluminum, purified manganese, aluminum-molybdenum master alloy, aluminum-tungsten master alloy, tantalum powder, TiB2 powder and graphite are placed in a vacuum induction melting furnace for melting to obtain 2.5 kg of alloy material.

[0074] S30: The alloy material is upsetting or drawing multiple times using a YMG27-100 100T forging press to prepare a 30mm×30mm forging alloy. The initial heating temperature for forging is 1350℃.

[0075] S40. The forging alloy is subjected to high-temperature treatment after forging at 1270℃ for 0.5h. After treatment, it is air-cooled (AC) to room temperature of 25℃~30℃, and then aged at 850℃ for 3h. After aging treatment, it is cooled to room temperature of 25℃~30℃ by furnace cooling (FC) to obtain manganese-containing titanium-aluminum alloy.

[0076] Performance testing 1. Morphological observation Using the polished microstructures of the manganese-titanium-aluminum alloys from Example 1 and Comparative Example 1 as test samples, the samples were observed using a JXA-8530F electron probe microanalysis (EPMA) in backscattered electron mode (BSE) to obtain... Figure 1 and Figure 2 , Figure 1 This is a characterization diagram of the Ta-containing sample from Example 1. Figure 2 The image shows the characterization of the sample to be tested in Comparative Example 1, which does not contain Ta. The characterization image shows the near-lamellar structure of the alloy.

[0077] Depend on Figure 1 and Figure 2 It can be seen that the average lamellar cluster size of Example 1 with Ta added is about 60 μm, while the average lamellar cluster size of Comparative Example 1 without Ta added is about 50 μm, which means that the addition of Ta in Example 1 resulted in a certain increase in cluster size.

[0078] 2. Creep performance test According to GB / T 2039-2012, the manganese-titanium-aluminum alloys of the examples and comparative examples were processed into creep performance test specimens with a gauge length of 49 mm and a diameter of 5 mm. Performance tests were conducted under creep conditions of 780℃ / 200MPa, and the total elongation and creep rupture time of the samples were recorded. The performance test results are shown in Table 1. Figure 3 .

[0079] Table 1

[0080] As shown in Table 1, the manganese-containing titanium-aluminum alloy of Example 1 has a better total elongation and a longer creep fracture time, indicating better creep resistance.

[0081] The manganese-titanium-aluminum alloy in Comparative Example 1, which did not contain Ta, had relatively poor creep resistance.

[0082] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for improving the creep properties of manganese-containing titanium-aluminum alloys, characterized in that, The chemical composition of the manganese-titanium-aluminum alloy, calculated by molar percentage of atoms, includes: Ti + 40.0at .%~48.0at .% Al + 1.0at .%~5.0at .% Mn + 0.2at .%~2.0at .% Mo + 0.1at .%~2.0at .% W + 0.1at .%~1.0at .% Ta; The method for improving the creep properties of manganese-containing titanium-aluminum alloys includes the following steps: Select titanium-containing raw materials, aluminum-containing raw materials, manganese-containing raw materials, molybdenum-containing raw materials, tungsten-containing raw materials, and tantalum-containing raw materials according to the chemical composition of the manganese-titanium-aluminum alloy; The selected raw materials are mixed and smelted to obtain alloy materials; The alloy material is forged to obtain a forging alloy; The forging alloy is subjected to post-forging heat treatment, primary cooling, aging treatment, and secondary cooling to obtain a manganese-containing titanium-aluminum alloy.

2. The method for improving the creep properties of manganese-containing titanium-aluminum alloys according to claim 1, characterized in that, The chemical composition of the manganese-titanium-aluminum alloy, calculated according to the molar percentage of atoms, further includes: 0.05 at .%~0.15 at .% of B and 0.05 at .%~0.15 at .% of C. In the step of mixing and melting the selected raw materials, the alloy material is obtained by mixing and melting boron-containing raw materials and carbon-containing raw materials.

3. The method for improving the creep properties of manganese-containing titanium-aluminum alloys according to claim 2, characterized in that, The titanium-containing raw material includes sponge titanium; The titanium-containing raw material includes pure aluminum metal; The aluminum-containing raw material includes an aluminum-molybdenum master alloy; The manganese-containing raw material includes pure manganese metal; The molybdenum-containing raw material includes an aluminum-molybdenum master alloy; The tungsten-containing raw material includes an aluminum-tungsten master alloy; The tantalum-containing raw material includes tantalum powder; The boron-containing raw material includes TiB2 powder; The carbon-containing raw material includes graphite.

4. The method for improving the creep properties of manganese-containing titanium-aluminum alloys according to claim 1, characterized in that, The temperature of the post-forging heat treatment is 1260℃~1290℃, and the time of the post-forging heat treatment is 0.4h~0.6h.

5. The method for improving the creep properties of manganese-containing titanium-aluminum alloys according to claim 1, characterized in that, The temperature of the first cooling is 25℃~30℃.

6. The method for improving the creep properties of manganese-containing titanium-aluminum alloys according to claim 1, characterized in that, The aging treatment temperature is 830℃~880℃, and the aging treatment time is 2.5h~3.5h.

7. The method for improving the creep properties of manganese-containing titanium-aluminum alloys according to claim 1, characterized in that, The primary cooling process uses air cooling.

8. The method for improving the creep properties of manganese-containing titanium-aluminum alloys according to claim 1, characterized in that, The secondary cooling is performed using furnace cooling.

9. A manganese-titanium-aluminum alloy, characterized in that, The manganese-containing titanium-aluminum alloy is prepared by the method for improving the creep properties of manganese-containing titanium-aluminum alloy as described in any one of claims 1 to 8.

10. The manganese-titanium-aluminum alloy according to claim 9, characterized in that, The chemical composition of the manganese-titanium-aluminum alloy, calculated by molar percentage of atoms, includes: Ti + 44.0 at.% Al + 3.1 at.% Mn + 0.35 at.% Mo + 0.38 at.% W + 0.45 at.% Ta + 0.09 at.% B + 0.11 at.% C.

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