期刊
SCRIPTA MATERIALIA
卷 65, 期 6, 页码 505-508出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2011.06.009
关键词
Bicrystal; Twin boundary; Grain boundary; Fatigue cracking; Persistent slip bands
类别
资金
- National Natural Science Foundation of China (NSFC) [50571104, 50625103, 50890173]
- National Basic Research Program of China [2010CB631006]
Two kinds of Cu bicrystals, with a high-energy grain boundary (GB) and a coherent twin boundary (TB) parallel to the loading direction respectively, were cyclically deformed to reveal the fatigue cracking mechanisms. It is shown that intergranular fatigue cracking occurred firstly in the bicrystal with the GB, while the persistent slip bands became the preferential cracking sites in the bicrystal with TB. These results indicate that the TB has an intrinsically higher fatigue cracking resistance than the GB. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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