期刊
ACTA MATERIALIA
卷 200, 期 -, 页码 821-834出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2020.09.062
关键词
Phase-field method; Microstructures; Magnesium; Deformation twinning; Grain boundary
资金
- National Natural Science Foundation of China [11872177]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51621004]
- National Key R&D Program of China [2017YFB1002704]
- China Scholarship Council
- U.S. Department of Energy by Lawrence Livermore National Laboratory (LLNL) [DE-AC52-07NA27344]
- Hydrogen Materials - Advanced Research Consortium (HyMARC) of the U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy (SERE), Fuel Cell Technologies Office (FCTO) [DE-AC52-07NA27.344]
- Hamer Professorship at Penn State
A phase-field model for describing dynamic interactions between deformation twins and grain boundaries in a hexagonal close packed (HCP) metal is established. It is applied to simulating the coupled evolution mechanisms of grains and twins in magnesium (Mg) by probing the transmission of {10 (1) over bar2} deformation twins across grain boundaries. We analyze the effect of the strain relaxation near a grain boundary, which is related to the geometric compatibility arising from the misorientation angle between adjoining grains. Phase-field simulations demonstrate that twin transmission across a grain boundary into a neighboring grain leads to grain boundary migration towards the neighboring grain with a reduced grain boundary width. The preferred nucleation site of new twin variant in the neighboring grain is related to the elastic interaction energy distribution. These predicted transmission behaviors agree well with existing experimental observations and molecular dynamics simulations. By analyzing set of systematic phase-field simulation results, we establish a rotation-angle-related twin variant selection rule for analyzing the transmission of {10 (1) over bar2} deformation twins across grain boundaries in Mg and its alloys. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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