Superplastic deformation behavior of the as-extruded AZ110 magnesium alloy with La-rich Mish metal addition

• DOI: 10.1016/j.jmrt.2020.01.063
• Publication Date: 2020-02-18T00:08:24Z
• Authors: Qiyu Liao; Qichi Le; Xingrui Chen; Xiaoqiang Li; YanChao Jiang; Lifeng Ma; Hu Wenxin
• Keywords: Superplasticity; Flow stress; Deformation mechanism; Tensile testing; Elongation

Tensile test at high temperature and electron backscatter diffraction (EBSD) techniques were combined to investigate the deformation behavior microstructure evolution of as-extruded AZ110 magnesium alloy with La-rich Mish Metal addition (AZ110LC for short). The stretching strain rate have great effect on flow stress alloy. rapidly reaches peak then decreases further until fracture. maximum elongation is 840% under 573 K 1.7 × 10−4s−1. excellent superplasticity ascribes refinement distribution sub-structures AZ110LC Moreover, sensitivity coefficient 0.41 active energy 87 kJ/mol 523 4.2 10−4s-1 indicating that mechanism GBS. Finally, shapes fraction cavities closed tensile fracture a influence samples different rates K. formation growth can effectively relax concentration coordinate compensate GBS in superplastic