A kind of tial alloy capable of inhibiting the formation of ordered ω phase and its preparation method

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 effects of improving microstructure stability, good microstructure stability, and simple process

Active Publication Date: 2022-05-13
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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  • A kind of tial alloy capable of inhibiting the formation of ordered ω phase and its preparation method
  • A kind of tial alloy capable of inhibiting the formation of ordered ω phase and its preparation method
  • A kind of tial alloy capable of inhibiting the formation of ordered ω phase and its preparation method

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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 suppressing the generation of ordered ω phase and its preparation method, which solves the problem of poor high-temperature performance caused by the existence of ordered ω phase in traditional TNM alloys; The content contains 43%-45% Al, 4% Nb, 0.6%-1% Mn, 0.1% B, and the balance is Ti and unavoidable impurities. Adding a certain amount to the TiAl alloy can inhibit the formation of ordered ω phase The effective alloying element Mn improves the microstructure stability of high-temperature γ‑TiAl alloys at high temperatures and successfully suppresses the β 0 The precipitation of the ordered ω phase in the TiAl alloy has been prepared, which can inhibit the formation of the ordered ω phase.

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 Patents(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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