Long-term creep and creep rupture characteristics of TiAl-base intermetallics

被引：18
|
作者：
Dlouhy, A. [1 ]
Kucharova, K. [1 ]
Orlova, A. [1 ]
机构：
[1] Acad Sci Czech Republic, Inst Phys Mat, Brno 61662, Czech Republic
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 510-11卷
关键词：
TiAl-base intermetallics; Creep; Creep rupture; Monkman-Grant relationship; MICROSTRUCTURE; ALLOYS; DEFORMATION;
D O I：
10.1016/j.msea.2008.07.077
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The present study investigates creep in three TiAl-base intermetallic alloys, Ti-48A1-2Cr-2Nb-1B, Ti-46Al-7Nb-0.6Cr-0.2Ni-0.1Si and Ti-46Al-2W-0.5Si-0.7B (all at.%), in the range of rupture times up to 25 000 h. Creep behaviour of the individual alloys at 1023 K is assessed and compared and reasons for creep strength variations are discussed. Results suggest that dislocation processes contribute to the creep strain accumulation even at creep rates as low as 7 x 10(-10) s(-1). Finally the applicability of Monkman-Grant-type relationships is critically analyzed. It is shown that these relationships stem from a general functional identity that is valid for any continuous creep curve. The role of the creep curve shape factor S is highlighted. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：350 / 355
页数：6
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