Initiation and Propagation Behavior of Fatigue Cracks in 2197(Al-Li)-T851 Alloy

被引：0
|
作者：
Chen Yuanyuan [1 ]
Zheng Ziqiao
Cai Biao
Xu Jianqiu
She Lingjuan
Li Hai [2 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Jiangsu Inst Technol, Changzhou 213164, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2011年 / 40卷 / 11期
关键词：
2197 Al-Li alloy; crack initiation and propagation; EBSD; fatigue fracture;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The initiation and propagation characteristics of the fatigue cracks were studied for 2197-T851 alloy. The results indicate that fatigue crack initiation is related to stress. Under smaller stress, fatigue cracks mainly initiate from the second phase particles and the interface between the second phase particles and matrix as well as from the surface defect. While with larger stress, fatigue cracks easily initiate from the grain boundary and the slip band. Fatigue cracks grow along the favorable slip plane with priority. When the favorable slip planes in the adjacent grains have an angle, the crack deflects. The coherent delta' particles that can be sheared by dislocation result in the crack path meandering in the grain. The cracks grow mainly in transgranular mode along the (111) plane, and also along the small-angle grain boundaries.
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页码：1926 / 1930
页数：5
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