Thermal stability of a fully lamellar Ti-48Al-2Cr-2Nb-1B alloy

被引：64

作者：

Hu, D ^{[1
]}

Godfrey, AB ^{[1
]}

Loretto, MH ^{[1
]}

机构：

[1] Univ Birmingham, Interdisciplinary Res Ctr Mat High Performance Ap, Birmingham B15 2TT, W Midlands, England

来源：

INTERMETALLICS | 1998年 / 6卷 / 05期

关键词：

titanium aluminide; based on TiAl; phase transformations; mechanical properties at ambient temperature;

D O I：

10.1016/S0966-9795(98)80019-8

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：

Ti-48Al-2Cr-2Nb-1B with a fully lamellar microstructure has been exposed at 700 degrees C for 3000 h in air and the effects of this exposure on microstructures and tensile properties examined. It has been found that during exposure the alpha(2) lamellae decomposed to gamma phase by a mechanism that involves the formation of thin gamma lamellae within the original alpha(2) lamellae. There is very little alpha(2) phase left after exposure. A hexagonal phase with a composition of (Ti:Al:Cr = 68:23:9) was also found to be a product decomposition of alpha(2). The yield strength and the ultimate tensile strength decreased by about 20% during the high temperature exposure. (C) 1998 Published by Elsevier Science Limited. All rights reserved.

引用

页码：413 / 417

页数：5

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