Investigation of the In-Plane Mechanical Anisotropy of Magnesium Alloy AZ31B-O by VPSC–TDT Crystal Plasticity Model

Materials

Shuangming Li¹  Peidong Wu²  Bo Zhang²  Yaodong Jiang³  Weiqin Tang³  Huamiao Wang⁴ 

[1] Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;;School of Mechanics &State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China;State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;

关键词: AZ31B alloy;    anisotropy;    polycrystal plasticity;    twinning;    R-value;   

DOI  :  10.3390/ma12101590

来源: DOAJ

【 摘 要 】

The in-plane mechanical anisotropy of magnesium alloy sheet, which significantly influences the design of the parts produced by Mg alloy sheets, is of great importance regarding its wide application. Though the stress–strain response and texture evolution have been intensively investigated, and the anisotropy of Mg alloy can be significantly substantiated by its R-value, which reveals the lateral response of a material other than the primary response. As a consequence, the conjunction of viscoplastic self-consistent model and twinning and detwinning scheme (VPSC–TDT) is employed to investigate the in-plane anisotropy of magnesium alloy AZ31B-O sheet. The loading cases include both tension and compression along different paths with respect to the processing direction of the sheet. It is revealed that the stress–strain relation, texture evolution, R-value, and involved deformation mechanisms are all loading path-dependent. The unique R-values of Mg alloys are interpreted with the aid of modeling behaviors of Mg single crystals. The results agree well with the corresponding experiments. It is found that the hexagonal close-packed (HCP) crystallographic structure, deformation twinning, and initial basal texture are responsible for the characteristic behavior of Mg alloys.

【 授权许可】

Unknown