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Spherical Ti3Al/TiAl two-phase alloy and preparation method thereof

A dual-phase alloy, spherical technology, applied in the field of dual-phase alloy and its preparation, can solve the problems of poor sintering performance, difficult to control TiAl alloy composition, high impurity content, achieve good thermal processing performance, reduce energy consumption and preparation cost, simple craftsmanship

Inactive Publication Date: 2012-10-17
HARBIN INST OF TECH
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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 provide a spherical TiAl alloy to solve the problems of difficulty in controlling the composition of the existing TiAl alloy, high oxygen content, high impurity content and poor sintering performance. 3 Al / TiAl dual-phase alloy and its preparation method

Method used

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  • Spherical Ti3Al/TiAl two-phase alloy and preparation method thereof
  • Spherical Ti3Al/TiAl two-phase alloy and preparation method thereof
  • Spherical Ti3Al/TiAl two-phase alloy and preparation method thereof

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specific Embodiment approach 1

[0017] Specific embodiment one: a spherical Ti of this embodiment 3 The Al / TiAl dual-phase alloy is composed of Ti and Al, and the mass ratio of Ti to Al is 65~68:32~35.

[0018] This embodiment solves the key problem that the TiAl dual-phase alloy is difficult to be formed by hot working. In this embodiment, a proper amount of spherical Ti with good deformability is distributed in TiAl 3 Al can significantly change the hot workability of TiAl dual-phase alloy. Whether it is compared with the full lamellar structure or the dual phase structure of TiAl alloy, spherical Ti 3 The Al / TiAl dual-phase alloy has the best high-temperature deformability, which can avoid the problems of difficulty in hot processing of brittle TiAl dual-phase alloy, high impurity content, and poor sintering performance.

specific Embodiment approach 2

[0019] Specific embodiment two: this embodiment is different from specific embodiment one in that the purity of the Ti is 99.0% to 99.9%, and the purity of Al is 99.0% to 99.9%. Others are the same as the first embodiment.

specific Embodiment approach 3

[0020] Specific embodiment three: a spherical Ti of this embodiment 3 The preparation method of Al / TiAl dual-phase alloy is carried out according to the following steps: 1. After mixing in a ratio of 65~68:32~35 by mass ratio of Ti to Al, it is put into a vacuum hot-pressing sintering furnace, and at the infiltration temperature Under the condition of 660℃~720℃, impregnate for 0.5~3h to obtain Ti-Al-TiAl 3 Three-phase composite; two, the Ti-Al-TiAl obtained in step two 3 The three-phase composite body is placed in a vacuum hot-pressing sintering furnace, the temperature of the vacuum hot-pressing sintering furnace is increased to 1100℃~1400℃, pressurized to 40~80MPa, holding for 0.5~2h, and then cooled with the furnace to obtain spherical Ti 3 Al / TiAl dual phase alloy.

[0021] The beneficial effects of this embodiment are:

[0022] 1. This embodiment solves the key problem that TiAl dual-phase alloy is difficult to be formed by hot working. In this embodiment, a proper amount of s...

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Abstract

The invention provides a spherical Ti3Al / TiAl two-phase alloy and a preparation method thereof, relating to a two-phase alloy and a preparation method thereof. The invention aims to solve the problems of difficult control on TiAl alloy components, high oxygen content and impurity content and poor sintering performance. The spherical Ti3Al / TiAl two-phase alloy is composed of Ti and Al; and the mass ratio of Ti to Al is (65-68):(32-35). The preparation method of the spherical Ti3Al / TiAl two-phase alloy comprises the following steps: 1, weighing Ti powder and Al ingots, and impregnating at the impregnation temperature of 660-720 DEG C for 0.5-3 hours to obtain a Ti-Al-TiAl3 three-phase compound body; and 2, preserving the Ti-Al-TiAl3 three-phase compound body at the temperature of 1100-1400 DEG C and the pressure of 40-80 MPa for 0.5-2 hours to obtain the spherical Ti3Al / TiAl two-phase alloy. The density of the two-phase alloy is higher than 98%. The invention is applicable to the fieldsof aerospace engines and automobile industry.

Description

Technical field [0001] The invention relates to a dual-phase alloy and a preparation method thereof. Background technique [0002] TiAl intermetallic compound has become a potential low-density high-temperature structural material due to its excellent high-temperature strength and relatively low specific gravity. Therefore, it has broad application prospects in the fields of aerospace engines, energy, and automobile industry. However, the shortcomings of TiAl alloys, such as low room temperature plasticity and insufficient high temperature deformation ability, have become the biggest obstacles to its engineering application. [0003] At present, in order to avoid the inherent brittleness of TiAl alloy and the difficulty of hot working deformation, the composite body of Ti and Al metal can be processed and formed, and then reacted and synthesized to prepare a TiAl alloy forming component. The commonly used element powder method to prepare TiAl-based alloy sheets is to use good plas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/04
Inventor 李爱滨李锋李斌玲范国华耿林逄锦程陈锐
Owner HARBIN INST OF TECH
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