期刊
SCRIPTA MATERIALIA
卷 94, 期 -, 页码 48-51出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2014.09.015
关键词
Twin boundaries (TB); Coherent twin boundaries (CTBs); Misorientation; CSL-Sigma 3; Slip system interaction
What determines if a grain boundary acts as a crack initiation site during fatigue? The grain boundary defines a mismatch of slip systems, which strongly depends on the three-dimensional positions of the boundary plane. In the case of a coherent Sigma 3 twin boundary, the boundary plane, and thus the mismatch between the slip systems, is known for all possible combinations of active slip systems. Thus, the tendency for crack initiation can be reduced to a purely geometric calculation. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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