Thermal cycling of Ti46Al8Nb1B

被引：14

作者：

Jiang, H. ^{[1
]}

Rong, T. S.

Hu, D.

Jones, I. P.

Voice, W.

机构：

[1] Univ Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England

[2] Univ Birmingham, IRC Mat, Birmingham B15 2TT, W Midlands, England

[3] Rolls Royce PLC, Derby DE24 8BJ, England

来源：

INTERMETALLICS | 2006年 / 14卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

titanium alummides; based on TiAl; thermomechanical treatment; microstructure; defects : dislocation geometry and arrangement; mechanical properties at ambient temperature;

D O I：

10.1016/j.intermet.2006.01.062

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 effects of thermal cycling on the mechanical properties and microstructure of a TiAl-based alloy (Ti(46)Al(8)Nb1B) have been investigated for samples with and without an imposed external stress. The temperature range (300-800 degrees C) and stress (0 or 300 MPa) were chosen to reflect likely industrial usage. Unstressed samples showed no significant effect of thermal cycling. Thermal cycling with external stress is found to reduce the yield stress, ductility and UTS and to increase the amount of primary creep. The microstructural changes include dislocation and twin generation, alpha(2)/gamma ledge formation, dissolution of alpha(2) lamellae and microcrack formation. The changes in mechanical properties are interpreted in terms of the changes in microstructure. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1433 / 1447

页数：15

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