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 [1 ]
Xi-ping Song [1 ]
Long Yu [1 ]
Hong-liang Li [1 ]
Ze-hui Jiao [2 ]
Hui-chen Yu [2 ]
机构：
[1] State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing
[2] Testing Research Center for Aeronautical Materials,Beijing Institute of Aeronautical Materials
来源：
International Journal of Minerals Metallurgy and Materials | 2013年 / 20卷 / 12期
关键词：
titanium aluminum alloys; niobium; fatigue crack propagation; high temperature testing;
D O I：
暂无
中图分类号：
TG115.57 [];
学科分类号：
080502 ;
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 ΔK th of a nearly lamellar high-Nb TiAl alloy with 8% Nb content at room temperature and 750 ℃ was determined as 12.89 MPa·m 1/2 and 8.69 MPa·m 1/2,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.
引用
收藏
页码：1192 / 1197
页数：6
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