Effect of Mixed-RE on Fluidity and Mechanical Properties of Die Casting AZ91D Magnesium Alloy

Author of the article:FAN Xiaoze, WANG Rui, MA Jun, QI Ershuai

Author's Workplace：Xi ’ an Sifang Ultralight Material Co., Ltd., Xi ’ an 711711, China

Key Words：AZ91D; die-casting magnesium alloy; Ce/La/Sm mixed-RE; fluidity

Abstract： The effects of La, Ce and Sm on microstructure, inclusion, mechanical properties and fluidity of die casting
AZ91D magnesium alloy were investigated by means of microstructure observation, tensile test and melting process
optimization. The results show that the addition of La/Ce rare earth mixture can improve the fluidity of the alloy, and the
addition of 0.3% La/Ce rare earth mixture can improve the fluidity of the alloy by 4.8%. After the compound refining of
flux +Ar 2 , the melt inclusion content is further reduced and the fluidity is increased by 10%. The mixed-RE of La/Ce/Sm
has no effect on improving the fluidity of the alloy, but has a good effect on improving the mechanical properties of the
alloy. When adding 0.8%, the tensile strength, yield strength and elongation of the alloy increase by 9.5%, 4.8% and 50%,
respectively.