期刊
ACTA MATERIALIA
卷 186, 期 -, 页码 291-307出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2020.01.010
关键词
Magnesium; Contraction twinning; Prismatic dislocation; Twin-slip interaction
资金
- U.S. National Science Foundation (NSF) [CMMI-1635088]
Very unusual and interesting interaction between matrix prismatic dislocations and {10 (1) over bar1} twin boundaries (TBs) in Magnesium (Mg) was observed in atomistic simulations. When the first prismatic dislocation impinged on the TB, the incoming dislocation was transmuted into a thin layer of {11 (2) over bar1} twin inside the {10 (1) over bar1} twin. When successive prismatic dislocations on the same slip plane impinged on the same location at the {10 (1) over bar1} TB, the {11 (2) over bar1} twin kept growing toward the opposite {10 (1) over bar1} TB. Eventually, the {11 (2) over bar 111 (2) over bar1} twin reached the opposite TB and was then transmuted back to prismatic dislocations that exited the {10 (1) over bar1} twin and glided into the matrix. Hence, the matrix prismatic dislocations temporarily lose their dislocation identity during twin-slip interaction and then resume their dislocation identity after the interaction is complete. The net effect of these interactions is that the matrix prismatic dislocations transmit across the {10 (1) over bar1} twin. Lattice correspondence analysis for {10 (1) over bar1} twinning was performed to understand the mechanism of the interactions. The results show that, the prismatic slip plane is exactly the corresponding plane of {11 (2) over bar1} twinning. Such a correspondence is consistent with the crystallographic calculations based on classical twinning theory. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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