Grain boundary grooving accelerated by local plasticity as a possible mechanism of liquid metal embrittlement

被引：30
|
作者：
Glickman, EE [1 ]
机构：
[1] Tel Aviv Univ, Fac Engn, IL-69978 Tel Aviv, Israel
来源：
INTERFACE SCIENCE | 2003年 / 11卷 / 04期
关键词：
kinetics of liquid metal embrittlement (LME); grain boundary (GB) failure; stress intensity factor; LME threshold; surface energy and GB segregation effects; GB grooving; local plasticity at the tip;
D O I：
10.1023/A:1026100112248
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Kinetic mechanism of premature grain boundary (GB) failure under simultaneous action of tensile stress and wetting liquid metals (LME) is not clear yet. We summarize briefly the stress intensity, surface energy and GB segregation effects in LME crack kinetics and the explanations that have been put forward. A possible mechanism of LME is outlined. It is proposed that GB cracks under LME propagate by Mullins grooving controlled by bulk diffusion in liquid and dramatically accelerated by periodic blunting of the groove tip by local plastic flow. It is found that this GALOP (Grooving Accelerated by Local Plasticity) mechanism captures the major experimental observations of stress intensity, surface energy and GB segregation effects in LME fairly well. A parallel between the GALOP mechanism and the GB subcritical crack growth under creep in inert atmosphere is mentioned.
引用
收藏
页码：451 / 459
页数：9
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