Fatigue small crack growth threshold determination of a high-Nb TiAl alloy at different temperatures by in-situ observation

被引：0
|
作者：
Min Zhang
Xi-ping Song
Long Yu
Hong-liang Li
Ze-hui Jiao
Hui-chen Yu
机构：
[1] University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials
[2] Beijing Institute of Aeronautical Materials,Testing Research Center for Aeronautical Materials
来源：
International Journal of Minerals, Metallurgy, and Materials | 2013年 / 20卷
关键词：
titanium aluminum alloys; niobium; fatigue crack propagation; high temperature testing;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The purpose of this paper is to estimate the fatigue crack growth threshold of a high-Nb TiAl alloy at the different temperatures based on scanning electron microscopy (SEM) in-situ observation. The results indicated that the fatigue crack growth threshold ΔKth of a nearly lamellar high-Nb TiAl alloy with 8% Nb content at room temperature and 750°C was determined as 12.89 MPa·m1/2 and 8.69 MPa·m1/2, respectively. The effect of the elevated temperature on the fatigue crack growth threshold cannot be ignored. At the same time, the early stage of fatigue crack propagation exhibited multicrack initiation and bridge-link behavior.
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页码：1192 / 1197
页数：5
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