STUDY ON PHASE-STABILITY IN TI-AL-X SYSTEMS AT HIGH-TEMPERATURES

被引：38

作者：

KIMURA, M

HASHIMOTO, K

MORIKAWA, H

机构：

[1] Advanced Materials and Technology Research Laboratories, Nippon Steel Corporation, Nakahara-ku, Kawasaki, 211, 1618, Ida

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1992年 / 152卷 / 1-2期

关键词：

D O I：

10.1016/0921-5093(92)90046-4

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of additional elements X(X = V, Cr, Mn, Nb, Mo and Ta) on gamma(TiAl)-based titanium aluminides has been investigated. The addition of elements X caused a change in phase equilibria among the gamma, alpha-2(Ti3Al) and beta (b.c.c. Ti) phases; the beta-phase is stabilized by the addition (except X = Ta), resulting in a drastic change in microstructures. The Ti-Al-Mo system has shown unique behavior; the beta-phase region protrudes toward the a phase region around 1200-degrees-C in the ternary phase diagram. The beta-phase contained in specimens quenched from high temperature has a long-range ordering structure that is different from the B2 structure. The chemical potentials of the beta, alpha and gamma-phases may have close values around 1200-degrees-C and their phase stabilities are strongly influenced by processing or heat treatment.

引用

页码：54 / 59

页数：6