Stability of B2 ordered phase in the Ti-rich portion of Ti-Al-Cr and Ti-Al-Fe ternary systems

被引：44

作者：

Kainuma, R

Ohnuma, I

Ishikawa, K

Ishida, K

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[2] Kitami Inst Technol, Kitami, Hokkaido 0908507, Japan

来源：

INTERMETALLICS | 2000年 / 8卷 / 08期

关键词：

titanium aluminides; based on Ti3Al; phase diagram; order/disorder transformations;

D O I：

10.1016/S0966-9795(00)00016-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The stability region of the B2 phase at 1000 degrees C in the Ti-rich part of the Ti-Al-Cr and Ti-Al-Fe ternary systems are investigated by energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM) using two-phase alloys and diffusion couples. It is established that the critical boundaries of the A2/B2 continuous ordering transition are functions of both the Al and Fe or Cr contents, and the phase equilibria between the alpha(2) and the beta and between the beta and FeTi (B2) phases are strongly affected by the A2/B2 order-disorder transition. By extrapolating these ternary data to the Ti-Al binary and using the Bragg-Williams-Gorsky approximation a metastable A2/B2 ordering boundary is postulated to exist at 1000 degrees C in the vicinity of 23.5 at%Al in the Ti-Al binary system. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：869 / 875

页数：7

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