Microstructure and properties of plasma remelted AZ91D magnesium alloy

作者：Cui Hong zhi^*; Meng Zhao tao; Xiao Cheng zhu; Sun Jin quan; Wang Cui xiang

来源：Transactions of Nonferrous Metals Society of China, 2015, 25(1): 30-35.

DOI：10.1016/S1003-6326(15)63575-0

• magnesium alloy
• plasma remelting
• solid solution strengthening
• refined crystalline strengthening
• wear resistance
• corrosion resistance

The surface of AZ91D magnesium alloy was remelted by plasma beam. The microstructure, composition, hardness, wear and corrosion resistance of the plasma remelted layer (PRL) were characterized. The results show that there is extremely fine and dendrite structure in the PRL at low magnification observation, which is still composed of alpha-Mg and beta-Mg17Al12 phases. But at high magnification observation, the microstructure of the PRL is equiaxial crystalline grains with size of 3-5 mu m. And also the content of alpha-Mg phase decreases while that of alpha-Mg17Al12 increases and distributes more uniformly in alpha-Mg matrix compared with the substrate. The hardness of the PRL is much higher than that of the substrate. There are plastic deformation, grains uprooting and tearing evidence with tiny even dimples in the tensile fracture of the PRL, which are different from the substrate. Furthermore, the surface wear and corrosion resistance of AZ91D are improved significantly after plasma remelting.

• 出版日期2015-1
• 单位山东科技大学