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A kind of titanium aluminum alloy and preparation method thereof

A titanium-aluminum alloy and pre-alloying technology, which is applied in the field of titanium-aluminum alloy and its preparation, can solve the problems of reducing the high-temperature oxidation resistance of titanium-aluminum alloy and the inability to form a good combination between the coating and the substrate, so as to improve the anti-stripping ability and inhibit Effects of growth, strength and plasticity improvement of TiO2

Active Publication Date: 2022-03-22
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, in order to coordinate the strength and plasticity of titanium-aluminum alloy, the common method is to add alloying elements, but many alloying elements such as Mn, V, Mo, Cr and Zr will reduce the high-temperature oxidation resistance of titanium-aluminum alloy. The high-temperature oxidation resistance of the alloy can generally deposit a coating on the surface of the alloy, but the coating and the substrate often cannot form a good bond

Method used

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  • A kind of titanium aluminum alloy and preparation method thereof
  • A kind of titanium aluminum alloy and preparation method thereof
  • A kind of titanium aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The experimental scheme that the present invention adopts:

[0028] (1) Ball milling: Use Ti48Al2Cr2Nb powder and rare earth Gd powder (0.3at%) raw materials according to the proportion and weigh them, then use a planetary ball mill to mix the materials, the speed of the ball mill is 300r / min, and the ball milling time is 4 hours. Mixed, the medium is tert-butanol, vacuum freeze-dried for 24 hours after mixing powder;

[0029] (2) Spark plasma sintering: heating rate 100°C / min, sintering temperature 1200°C, sintering pressure 40MPa, heat preservation and pressure holding time 5 minutes, sintering with argon;

[0030] (3) Oxidation sample preparation: wire cutting into a size of 4 × 4 × 8mm 3 The six surfaces of the sample were ground to 600 mesh with SiC sandpaper, then ultrasonically cleaned in alcohol for 15 minutes, and then dried with a hair dryer;

[0031] (4) Isothermal oxidation experiment: carried out in a box-type resistance furnace, the experimental medium i...

Embodiment 2

[0039] The experimental scheme that the present invention adopts:

[0040] (1) Ball milling: Use Ti48Al2Cr2Nb powder and rare earth Gd powder (0.15at%) raw materials according to the proportion and weigh them, then use a planetary ball mill to mix the materials, the speed of the ball mill is 300r / min, and the ball milling time is 4 hours. Mixed, the medium is tert-butanol, vacuum freeze-dried for 24 hours after mixing powder;

[0041] (2) Spark plasma sintering: heating rate 100°C / min, sintering temperature 1200°C, sintering pressure 40MPa, heat preservation and pressure holding time 5 minutes, sintering with argon;

[0042] (3) Oxidation sample preparation: wire cutting into a size of 4 × 4 × 8mm 3 The six surfaces of the sample were ground to 600 mesh with SiC sandpaper, then ultrasonically cleaned in alcohol for 15 minutes, and then dried with a hair dryer;

[0043] (4) Isothermal oxidation experiment: carried out in a box-type resistance furnace, the experimental medium ...

Embodiment 3

[0051] The following examples and comparative examples are all based on Example 2, but the relevant preparation process parameters are different, and the specific parameters are shown in Table 1

[0052] The preparation conditions of table 1 embodiment 3-7, comparative example 1-6

[0053] Heating rate (℃ / min) Sintering temperature (℃) Holding time (min) Gd(at%) Example 3 80 1200 5 0.15 Example 4 120 1200 5 0.15 Example 5 100 1150 5 0.15 Example 6 100 1250 5 0.15 Example 7 100 1200 3 0.15 Comparative example 1 70 1200 5 0.15 Comparative example 2 130 1200 5 0.15 Comparative example 3 100 1100 5 0.15 Comparative example 4 100 1300 5 0.15 Comparative example 5 100 1200 5 0.20 Comparative example 6 100 1200 5 0.35

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Abstract

The invention discloses a titanium-aluminum alloy, which belongs to the technical field of alloy materials. The atomic percentages of elements in the raw material of the titanium-aluminum alloy are: Ti: 46%-49%, A1: 46%-49%, Cr: 1.5% ‑2.5%, Nb: 1.5%‑2.5%, Gd: 0.15‑0.3%; the present invention also discloses the preparation method of above-mentioned titanium-aluminum alloy, and its method is to use pre-alloyed Ti‑48Al‑2Cr‑2Nb and elemental Gd powder as The raw material is sintered by plasma sintering to obtain a two-state structure with Gd-rich phase distributed at the powder grain boundary; spark plasma sintering is preferably used; the present invention makes the limit resistance of the alloy at room temperature by adding an appropriate amount of Gd and combining the spark plasma sintering process. The compressive strength is improved, and the aluminum oxide film formed by high temperature oxidation is denser, the growth of titanium oxide is inhibited, the thickness of the oxide film is reduced, the growth stress and thermal stress in the oxide film are reduced, and the cracking of the oxide film is prevented; After 800℃ isothermal oxidation test for 500h, all the alloys containing Gd did not find falling off and cracking, and the addition of Gd improved the oxidation resistance of the alloys.

Description

technical field [0001] The invention relates to the field of alloy materials, in particular to a titanium-aluminum alloy with excellent mechanical properties and high-temperature oxidation resistance and a preparation method thereof. Background technique [0002] Due to its excellent mechanical properties such as low density, high specific strength and excellent creep resistance, titanium-aluminum-based alloys have been used in aerospace engineering to replace nickel-based superalloys as high-temperature structural materials in recent years. TiAl alloys have been used in the 650-750 °C structure of the new generation of turbine engines, especially the Ti-48Al-2Cr-2Nb alloy as a "classic" titanium-aluminum alloy is still widely used after years of development due to its good comprehensive properties. [0003] However, due to its poor machinability, the application of titanium-aluminum alloys is still limited. In order to improve the plasticity of titanium-aluminum alloys, all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/04B22F3/105
CPCC22C30/00C22C14/00C22C21/003C22C1/0416C22C1/0458B22F3/105
Inventor 孙红亮蒋小松郭茜茜陈松王良辉
Owner SOUTHWEST JIAOTONG UNIV
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