J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (10): 2200-2206.DOI: 10.1016/j.jmst.2019.04.030

• Orginal Article • Previous Articles     Next Articles

Grain-scale deformation in a Mg-0.8 wt% Y alloy using crystal plasticity finite element method

Wenxue Lia, Leyun Wanga*(), Bijin Zhoua, Chuanlai Liua, Xiaoqin Zengab   

  1. a National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
    b The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China
  • Received:2018-12-25 Revised:2019-03-13 Accepted:2019-04-10 Online:2019-10-05 Published:2019-08-28
  • Contact: Wang Leyun

Abstract:

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.

Key words: Magnesium alloys, Crystal, Plasticity finite element modeling, EBSD, Dislocation, Mechanical, Behavior