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Beta-gamma TiAl alloy and preparation method thereof

A technology of alloy and metal casting, which is applied in the field of TiAl alloy and its preparation, and can solve the problems of poor deformation ability of TiAl alloy at high temperature

Inactive Publication Date: 2012-12-19
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a beta-gamma TiAl alloy and a preparation method thereof in order to solve the problem of poor high-temperature deformability of existing TiAl alloys

Method used

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  • Beta-gamma TiAl alloy and preparation method thereof
  • Beta-gamma TiAl alloy and preparation method thereof
  • Beta-gamma TiAl alloy and preparation method thereof

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specific Embodiment approach 1

[0015] Specific Embodiment 1: In this embodiment, the beta-gamma TiAl alloy is made of 38% to 43% Al, 2% to 8% X, 0% to 2% A and the rest Ti, wherein X Is Mo or Mn element, A is B or Y (yttrium) element.

specific Embodiment approach 2

[0016] Specific Embodiment 2: In this embodiment, the beta-gamma TiAl alloy is made of 38.6% to 40% of Al, 2.5% to 4% of X, 0% to 2% of A and the rest of Ti, wherein X Is Mo or Mn element, A is B or Y (yttrium) element.

specific Embodiment approach 3

[0017] Specific embodiment three: the preparation method of the present embodiment beta-gamma TiAl alloy is implemented according to the following steps:

[0018] 1. According to the atomic percentage of 38%~43%Al, 2%~8%X, 0%~2%A and the rest of Ti, weigh the sponge titanium, high-purity aluminum, AlX master alloy and high-purity A; 2. Pour the raw materials weighed in step 1 into a water-cooled copper crucible vacuum induction melting furnace, and control the vacuum degree of the melting chamber to be less than 10 -2 mbar, adjust the power of the smelting furnace to increase to 350-400KW within 20 minutes, then stop increasing the power, and keep warm for 8-20 minutes to obtain the alloy melt; 3. Preheat the metal casting mold to 200-500°C to obtain the preheated metal casting mold, and then pour the alloy melt into the preheated metal casting mold, and cool it to room temperature in a vacuum induction furnace to obtain a beta-gamma TiAl alloy;

[0019] Wherein the X describ...

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Abstract

The invention provides a beta-gamma TiAl alloy and a preparation method thereof, relating to a TiAl alloy and a preparation method thereof. The invention mainly solves the problem that the existing TiAl alloy has poor high temperature deformability. The beta-gamma TiAl alloy is prepared from Al, X, A and balance of Ti, wherein X is element Mo or Mn, and A is element B or Y. The preparation method comprises the following steps of: firstly, weighing raw materials in percent by atom; secondly, pouring the raw materials into a vacuum induction melting furnace to be subjected to vacuum melting; and thirdly, pouring an alloy melt into a preheated metal casting mould, thus the beta-gamma TiAl alloy is obtained. The beta-gamma TiAl alloy prepared by adopting the invention improves high temperature deformability of a titanium-aluminium alloy, deformation adopting nearly isothermal sheath forging can reach up to 80%, surface of a prepared forging stock is smooth, internal tissue is thin and uniform, and the prepared forging stock is mainly applied to aviation and automobile industrial materials.

Description

technical field [0001] The invention relates to a TiAl alloy and a preparation method thereof. Background technique [0002] TiAl alloy has outstanding characteristics such as low density, high specific strength and specific modulus, good high temperature oxidation resistance and creep resistance, and excellent high temperature strength, and has broad application prospects in aerospace and automotive industries. Wrought TiAl alloy has a finer and more uniform structure than cast TiAl alloy, higher strength and plastic deformation ability, and is an urgently needed material in the process of TiAl engineering transformation. The existing common TiAl alloy contains γ phase, α 2 Phase and a very small amount of β phase have low plasticity and poor deformability. The β phase has a body-centered cubic structure, which has more actuatable slip systems at high temperatures and is more prone to deformation. At the same time, the existence of β phase and fine γ phase can significan...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C30/00C22C1/03
Inventor 陈玉勇孔凡涛张树志邓宁嘉葛伟徐国俊
Owner HARBIN INST OF TECH
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