Grain-scale deformation in a Mg-0.8wt% Y alloy using crystal plasticity finite element method
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第10期
论文作者：Wenxue Li Leyun Wang Bijin Zhou Chuanlai Liu Xiaoqin Zeng
文章页码：2200 - 2206
摘 要：Magnesium（Mg） alloys with hexagonal close-packed（HCP） structure usually have a poor ductility at room temperature. The addition of yttrium（Y） can improve the ductility of Mg alloys. To understand the underlying mechanism, crystal plasticity finite element method（CPFEM） was employed to simulate the tensile deformation of a Mg-0.8 wt% Y alloy. The simulated stress–strain curve and the grain-scale slip activities were compared with an in-situ tensile test conducted in a scanning electron microscope.According to the CPFEM result, basal slip is the dominant deformation mode in the plastic deformation stage, accounting for about 50% of total strain. Prismatic slip and pyramidal a slip are responsible for about 25% and 20% of the total strain, respectively. Pyramidal c + a slip and twinning, on the other hand,accommodate much less strain.
Wenxue Li1，Leyun Wang1，Bijin Zhou1，Chuanlai Liu1，Xiaoqin Zeng1,2
1. National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University2. The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University
摘 要：Magnesium（Mg） alloys with hexagonal close-packed（HCP） structure usually have a poor ductility at room temperature. The addition of yttrium（Y） can improve the ductility of Mg alloys. To understand the underlying mechanism, crystal plasticity finite element method（CPFEM） was employed to simulate the tensile deformation of a Mg-0.8 wt% Y alloy. The simulated stress–strain curve and the grain-scale slip activities were compared with an in-situ tensile test conducted in a scanning electron microscope.According to the CPFEM result, basal slip is the dominant deformation mode in the plastic deformation stage, accounting for about 50% of total strain. Prismatic slip and pyramidal a slip are responsible for about 25% and 20% of the total strain, respectively. Pyramidal c + a slip and twinning, on the other hand,accommodate much less strain.
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