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preparation method of spherical ti3al/tial two-phase alloy

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

Inactive Publication Date: 2013-10-16
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 difficult control of the composition of the existing TiAl alloy, high oxygen content, high impurity content and poor sintering performance. 3 Preparation method of Al / TiAl dual-phase alloy

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  • preparation method of spherical ti3al/tial two-phase alloy
  • preparation method of spherical ti3al/tial two-phase alloy
  • preparation method of spherical ti3al/tial two-phase alloy

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specific Embodiment approach 1

[0019] Specific embodiment one: a kind of spherical Ti of this embodiment 3 The Al / TiAl dual-phase alloy is composed of Ti and Al, wherein the mass ratio of Ti and Al is 65-68:32-35.

[0020] This embodiment solves the key problem that the TiAl dual-phase alloy is difficult to be hot-formed. In this embodiment, an appropriate amount of spherical Ti with good deformability is distributed in TiAl 3 Al, can significantly change the hot workability of TiAl dual-phase alloys. Whether it is compared with the full lamellar structure or the TiAl dual-phase alloy with the double state structure, the spherical Ti 3 The Al / TiAl dual-phase alloy has the best high-temperature deformation ability, which can avoid the problems of difficult thermal processing, high impurity content, and poor sintering performance of the brittle TiAl dual-phase alloy.

specific Embodiment approach 2

[0021] Embodiment 2: This embodiment differs from Embodiment 1 in that: the purity of Ti is 99.0%-99.9%, and the purity of Al is 99.0%-99.9%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: a kind of 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 according to the ratio of Ti and Al mass ratio of 65-68:32-35, put it into a vacuum hot-pressing sintering furnace, at the impregnation temperature Under the condition of 660℃~720℃, impregnate for 0.5~3h to get Ti-Al-TiAl 3 Three-phase complex; Two, the Ti-Al-TiAl that step 2 obtains 3 The three-phase composite is placed in a vacuum hot-pressing sintering furnace, the temperature of the vacuum hot-pressing sintering furnace is raised to 1100 ° C ~ 1400 ° C, pressurized to 40 ~ 80 MPa, kept for 0.5 ~ 2 hours, and then cooled with the furnace to obtain spherical Ti 3 Al / TiAl dual phase alloy.

[0023] The beneficial effects of this embodiment are:

[0024] 1. This embodiment solves the key problem that the TiAl dual-phase alloy is difficult to be hot-formed. In this embodiment, an app...

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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 fields of aerospace engines and automobile industry.

Description

technical field [0001] The invention relates to a preparation method of a dual-phase alloy. Background technique [0002] Due to the advantages of excellent high-temperature strength and relatively low specific gravity, TiAl intermetallic compound has become a very potential low-specific-gravity high-temperature structural material, so it has broad application prospects in the fields of aerospace engines, energy and automobile industries. 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 and difficult thermal deformation of TiAl alloys, it is possible to process the composite of Ti and Al metals first, and then react and synthesize them to prepare TiAl alloy shaped components. The commonly used element powder method to prepare TiAl-based alloy sheets is to use Ti...

Claims

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Application Information

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Patent Type & Authority Patents(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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