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Titanium-aluminum-based polycrystalline heat-resistant titanium alloy and preparation method thereof

A technology of heat-resistant alloys and base alloys, applied in the field of titanium and titanium alloy processing, can solve the problems of poor plasticity at room temperature, high brittleness, and difficult plastic deformation, and achieve the effects of improving strength, increasing service temperature, and increasing high temperature strength.

Active Publication Date: 2021-05-25
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single-phase γ (TiAl) alloy has poor room temperature plasticity and high brittleness. Even when the elongation rate is 0.5%-1.0%, brittle fracture will occur and it is difficult to carry out plastic deformation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Ti-46Al-2.5(Cr+V)-1.9(Ta+Mo)-0.9Si-6.0Nb-0.4Ni-0.08Y-1.4Zr-0.6B titanium alloy ingot, control the oxygen content below 0.18 at.%

[0037] ⑴ With 0 grade sponge titanium, double zero grade electrolytic aluminum ingot, Al-80%V master alloy, Al-80%Mo master alloy, Ti-25%Si master alloy, Al-60%Cr master alloy, Al-10% B master alloy is used as raw material, or CrBAl, CrAlSi, NbAlTi master alloy produced by aluminothermic method is used as raw material. The electrolytic aluminum ingots are cut into blocks with a particle size of 8-12.7mm for later use, and the intermediate alloy is crushed and screened to a particle size of 3-12.7mm for later use.

[0038] ⑵ Send the prepared electrolytic aluminum, Al-80%V master alloy, Al-80%Mo master alloy, Ti-25%Si master alloy, Al-60%Cr master alloy, Al-10%B master alloy into the drying Oven drying, removing the adsorbed moisture in the raw materials, drying, drying is completed, and the raw materials are directly out of the ...

Embodiment 2

[0048] Example 2: Ti-45Al-3.0(Mn+V)-1.9(Ta+Mo)-7.0Nb-0.5Ni-0.10Y-1.4Zr-0.6B titanium alloy ingot, control oxygen content below 0.18at.%

[0049] ⑴With 0 grade sponge titanium, double zero grade electrolytic aluminum ingot, Al-80%V master alloy, Al-80%Mo master alloy, Ti-65%Mn master alloy, Ti-30%Ta master alloy, Al-5% Y master alloy, Al-10%B master alloy, pure nickel and pure niobium are used as raw materials. The electrolytic aluminum ingots are cut into blocks with a particle size of 8-12.7mm for later use, and the intermediate alloy is crushed and screened to a particle size of 3-12.7mm for later use.

[0050] ⑵The prepared electrolytic aluminum, Al-80%V master alloy, Al-80%Mo master alloy, Ti-65%Mn master alloy, Ti-30%Ta master alloy, Al-10%B master alloy, Al-5 The %Y master alloy, pure nickel, and pure niobium are sent to the drying furnace for drying to remove the adsorbed moisture in the raw materials. After drying and drying, the raw materials are directly released fr...

Embodiment 3

[0060] Example 3: Ti-46Al-6.0Nb-0.4Ni-0.11Y-2.0V-1.0Cr-0.4W-1.5Mo

[0061] -1.5Zr-0.6B titanium alloy ingot, the oxygen content is controlled below 0.18at.%.

[0062] ⑴ With 0 grade sponge titanium, double zero grade electrolytic aluminum ingot, Al-80%V master alloy, Al-80%Mo master alloy, Ti-65%W master alloy, Ti-25%Zr master alloy, Al-60% Cr master alloy, Al-5%Y master alloy, Al-10%B master alloy, Ti-C master alloy, pure nickel and pure niobium are used as raw materials. The electrolytic aluminum ingots are cut into blocks with a particle size of 8-12.7mm for later use, and the intermediate alloy is crushed and screened to a particle size of 3-12.7mm for later use.

[0063] ⑵The prepared electrolytic aluminum, Al-80%V master alloy, Al-80%Mo master alloy, Ti-65%W master alloy, Ti-25%Zr master alloy, Al-60%Cr master alloy, Al-5 The %Y master alloy, Al-10%B master alloy, Ti-C master alloy, and pure nickel and pure niobium are sent to the drying furnace for drying to remove th...

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Abstract

The invention discloses a titanium-aluminum-based polycrystalline heat-resistant alloy and a preparation method thereof. According to the titanium-aluminum-based polycrystalline heat-resistant alloy and the preparation method thereof, the alloy performance is improved through multi-element alloying; an alloy structure evolution path is changed through microalloying; the alloy cast ingot structure is refined by adding boron and carbon; through solid solution and precipitation strengthening, the strength and creep resistance are improved, and the high-temperature oxidation resistance and environment embrittlement resistance are improved; the alloy is strengthened through hot working, heat treatment and rapid cooling phase change; and the high-temperature strength, the fracture toughness and the creep resistance are improved through the lamellar structure of the gamma (TiAl), and the purposes of improving the use temperature and prolonging the high-temperature service life are achieved.

Description

technical field [0001] The invention relates to titanium and titanium alloy processing, belongs to the technical field of nonferrous metal material processing and alloying, in particular to a titanium-aluminum-based polycrystalline heat-resistant alloy and a preparation method thereof. Background technique [0002] Due to its light weight, high specific strength, and excellent heat resistance, titanium alloys are widely used in aviation, aerospace, submarines, ships, high-speed missile shells, and automotive engines. Titanium alloys are used to replace nickel-based materials in various engines. High-temperature alloys can reduce weight by 50%, greatly reduce structural weight, increase payload and range, and improve energy efficiency. With the rapid development of aerospace, submarines and transportation industries, higher requirements are put forward for widely used heat-resistant titanium alloys. The existing titanium-based alloys include Ti600 in China, Ti1100 in the Unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/03C22F1/02
CPCC22C14/00C22C1/03C22F1/02C22F1/183C22C30/00
Inventor 贺永东孙郅程
Owner XINJIANG UNIVERSITY
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