标题：Microstructure and properties of AZ91D magnesium alloy remelted by plasma beam
作者：Cui, Hong-Zhi ;Xiao, Cheng-Zhu ;Sun, Jin-Quan ;Yang, Hong-Guang
作者机构：[Cui, Hong-Zhi ;Sun, Jin-Quan ;Yang, Hong-Guang ] School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 更多
来源：Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
摘要：The plasma-remelting layer on the surface of AZ91D magnesium alloy was obtained by high energy density plasma beam treatment. The microstructure, composition, wear resistance and intensity of the plasma-remelting zone were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), electron probe X-ray microanalyser (EPMA), friction tester and tension tester, respectively. The results show that the plasma-remelting layer is still composed of α-Mg and β-Mg17Al12with fine texture. The crystalline grains are equiaxial with size of 1-2 μm. However, the content of α-Mg decreases while β-Mg17Al12increases, whose distribution becomes more uniform. The depth of the plasma-remelting zone depends on the current intensity of the beam. The larger the current is, the deeper the depth is. Compared with 60-70 HV0.1of the substrate, the microhardness of the remelting layer reaches up to 105-125 HV0.1. The tensile fracture is fine with plastic deformation trace. The tiny evenly fibroid tearing trace forms dimple and there are obvious grain uproot trace. The plasma remelting treatment is helpful to improve the wear resistance and intensity of the surface of AZ91D magnesium alloy.