TiAl alloy capable of inhibiting generation of ordered omega phase and preparation method of TiAl alloy

An alloy, an inevitable technology, applied in the field of high-temperature γ-TiAl-based alloys, can solve problems such as poor high-temperature performance, and achieve the effect of improving microstructure stability, simple process, and good microstructure stability.

Active Publication Date: 2021-10-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor high-temperature performance due to the existence of ordered ω phase in traditional TNM alloy (Ti-43.5Al-4Nb-1Mo-0.1B), and to provide a kind of alloy that can inhibit the formation of ordered ω phase TiAl alloy and its preparation method

Method used

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  • TiAl alloy capable of inhibiting generation of ordered omega phase and preparation method of TiAl alloy
  • TiAl alloy capable of inhibiting generation of ordered omega phase and preparation method of TiAl alloy
  • TiAl alloy capable of inhibiting generation of ordered omega phase and preparation method of TiAl alloy

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Embodiment 1

[0044] This embodiment is a TiAl alloy that can inhibit the formation of an ordered ω phase. The atomic percentage is: Ti-43.5Al-4Nb-0.6Mn-0.1B, and the balance is Ti; the preparation of the TiAl alloy is realized through the following steps:

[0045] Step 1) Ingredients

[0046] Zero-grade sponge titanium, A00-grade high-purity aluminum, Nb-Al master alloy, high-purity manganese, and high-purity boron are mixed according to the composition ratio of 51.8at%Ti, 43.5at.%Al, 4at.%Nb, 0.6at.%Mn , 0.1at.% B is prepared into a sample weighing about 40g and mixed evenly;

[0047] Step 2) Melting the ingot

[0048] Place the sample in step 1) in the crucible of a vacuum non-consumable arc melting furnace for melting, and melt it five times. From the second melting, the ingot needs to be turned over for each melting to ensure the uniformity of the ingot , the smelting vacuum degree is lower than 0.1Pa, and the smelting current is controlled within an appropriate range. After five tim...

Embodiment 2

[0056] This embodiment is a TiAl alloy that can inhibit the formation of an ordered ω phase. The atomic percentage is: Ti-43.5Al-4Nb-0.8Mn-0.1B, and the balance is Ti; the preparation of the TiAl alloy is realized through the following steps:

[0057] Step 1) Ingredients

[0058] Zero-grade sponge titanium, A00-grade high-purity aluminum, Nb-Al master alloy, high-purity manganese, and high-purity boron are mixed according to the composition ratio of 51.6at%Ti, 43.5at.%Al, 4at.%Nb, 0.8at.%Mn , 0.1at.% B is prepared into a sample weighing about 40g and mixed evenly;

[0059] Step 2) Melting the ingot

[0060] Place the sample in step 1) in the crucible of a vacuum non-consumable arc melting furnace for melting, and melt it five times. From the second melting, the ingot needs to be turned over for each melting to ensure the uniformity of the ingot , the smelting vacuum degree is lower than 0.1Pa, and the smelting current is controlled within an appropriate range. After five tim...

Embodiment 4

[0080] This embodiment is a TiAl alloy that can inhibit the formation of an ordered ω phase. The atomic percentage is: Ti-44.5Al-4Nb-0.6Mn-0.1B, and the balance is Ti; the preparation of the TiAl alloy is realized through the following steps:

[0081] Step 1) Ingredients

[0082] Zero-grade sponge titanium, A00-grade high-purity aluminum, Nb-Al master alloy, high-purity manganese, and high-purity boron are mixed according to the composition ratio of 50.8at%Ti, 44.5at.%Al, 4at.%Nb, 0.6at.%Mn , 0.1at.% B is prepared into a sample weighing about 40g and mixed evenly;

[0083] Step 2) Melting the ingot

[0084] Place the sample in step 1) in the crucible of a vacuum non-consumable arc melting furnace for melting, and melt it five times. From the second melting, the ingot needs to be turned over for each melting to ensure the uniformity of the ingot , the smelting vacuum degree is lower than 0.1Pa, and the smelting current is controlled within an appropriate range. After five tim...

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Abstract

The invention provides a TiAl alloy capable of inhibiting generation of an ordered omega phase and a preparation method of the TiAl alloy, and solves the problem of poor high-temperature performance caused by existence of the ordered omega phase in a traditional TNM alloy. The TiAl alloy comprises 43%-45% of Al, 4% of Nb, 0.6%-1% of Mn, 0.1% of B and the balance Ti and inevitable impurities according to the atomic percent, a certain amount of alloy element Mn with the inhibiting effect on generation of the ordered omega phase is added into the TiAl alloy, the structure stability of the high-temperature gamma-TiAl alloy at the high temperature is improved, precipitation of the ordered omega phase in a beta 0 phase is successfully inhibited, and the TiAl alloy capable of inhibiting generation of the ordered omega phase is prepared.

Description

technical field [0001] The invention belongs to the technical field of TiAl intermetallic compound materials, and relates to a TiAl alloy capable of suppressing the formation of an ordered ω phase, which can also be called a high-temperature γ-TiAl-based alloy. Background technique [0002] As a high-temperature structural material for weight reduction of advanced aero-engines, lightweight and high-strength TiAl alloy has the characteristics of high melting point, low density, and good mechanical properties. It has shown huge market prospects in recent years. With the rapid development of the aerospace industry, aerospace vehicles have more and more stringent requirements on their engines. Turbine blades are the core components of aero-engines. They are always in a high-temperature, high-pressure, and high-speed working environment, and are subjected to cyclic alternating loads such as centrifugal force, aerodynamic force, and temperature stress. The service environment is v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C30/00C22C1/03
CPCC22C14/00C22C30/00C22C1/03
Inventor 宋霖熊焌轶张铁邦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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