期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 692, 期 -, 页码 274-279出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.09.024
关键词
Mg alloys; Twinning; Plastic deformation; Grain boundaries
资金
- Fundamental Research Funds for the Central Universities
With the help of trace analysis, cross-grain boundary (cross-GB) contraction twin (CTW) pairs and bands can be identified more easily in a deformed Mg alloy. Cross-GB CTW pairs can form in two neighboring grains with misorientations from 5 degrees to 60 degrees. Schmid factor (SF) analysis reveals that the majority of them are high SF twin variants, indicating that the applied macro stress plays the most important role in their nucleation. Twinning shear compatibility over GB has been explicitly evaluated by a geometrical compatibility parameter (m'). It is found that nearly half of the cross-GB contraction twin pairs have high m' values greater than 0.7, indicating that their formation is mainly due to twinning shear transmission over GBs. However, dramatically different from cross-GB extension twin pairs and bands reported before, the rest of the cross-GB contraction twin pairs have low m' values smaller than 0.4. Their formation is due to the dominance of the applied macro stress near GBs. (C) 2016 Elsevier B.V. All rights reserved.
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