Measuring method of equilibrium phase of multi-component Ti-Al-X intermetallic compound

Abstract

The invention relates to a measuring method of the equilibrium phase of a multi-component Ti-Al-X intermetallic compound. The measuring method comprises the steps of firstly carrying out diffusion-couple reference alloy composition design;preparinga diffusion-couple reference alloy casting ingot byadopting a vacuum-induction electric arc melting technology; cutting the melted diffusion-couple reference alloy casting ingot into a test sample; grinding the test sample till the surface is smooth and flat, and then carrying out vacuum prewelding; then carrying out long-time balance diffusion treatment on the pre-welded sample, and forming a diffusion layer between two reference alloys; then preparing a middle diffusion layer into a metallographic sample, andobserving; testing the contents of Al and Ti of the two ends of a phase interface of the sample by adopting an electronic probe technology, drawing concentration distribution curve of the Al and the Ti from an alpha-phase area to a gamma-phase area and obtaining equilibrium compositions of the two phases. Compared with the prior art, the measuring method has important theoretical guidance and practice significance on research ofthe equilibrium phase of multi-component Ti-Al-X intermetallic compound.

Description

technical field [0001] The invention belongs to the field of phase equilibrium research of multi-component TiAl-based intermetallic compounds, in particular to a multi-component Ti-Al-X system (X can be Nb, Mo, Cr, V, Si, W, Ta, C, One or more of Fe, B, Y and other elements) measurement method for the equilibrium phase of intermetallic compounds. Background technique [0002] TiAl intermetallic compounds are considered to be a very competitive and promising development due to their low density, high specific strength, specific stiffness, corrosion resistance, wear resistance, high temperature resistance and excellent oxidation resistance. Lightweight high temperature structural material for aerospace. However, its room temperature brittleness limits its application. Heat treatment based on the theoretical basis of the phase transition point of TiAl intermetallic compounds is an effective means of microstructure control and the key to improving the properties of TiAl-based ...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is aimed at the complex Ti-Al-X based intermetallic compound (X can be one or more of elements such as Nb, Mo, Cr, V, Si, W, Ta, C, Fe, B, Y, etc. Several) the difficult problem of phase transition temperature measurement, a kind of measurement method of multicomponent Ti-Al-X series intermetallic compound equilibrium phase is provided, and the method of the present invention is for the multicomponent Ti-Al-X intermetallic of given composition Compound phase equilibrium research has important theoretical guidance and practical significance

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