Effect of neodymium on the as-extruded ZK20 magnesium alloy

赵亚忠^1,2，潘复生^1,3，彭建^1,3，王维青¹，罗素琴¹

1. College of Materials Science and Engineering, Chongqing University2. Department of Mechanic and Electronic Engineering, Nanyang Institute of Technology3. National Engineering Research Center for Magnesium Alloys, Chongqing University

摘 要：The effect of Nd addition on the microstructure and mechanical properties of ZK20 magnesium alloy was investigated by room tensile test, optical microscopy, X-ray diffraction （XRD） and scanning electron microscopy （SEM） in order to develop a magnesium alloy with higher ductility. Results showed that the crystal grains of as-extruded ZK20+0.5%Nd magnesium alloy were effectively refined, and the alloy exhibited higher strength and ductility, with the UTS of 237 MPa and the elongation of 32.8%, increasing by 5% and 50% for those of ZK20 alloy respectively. Some fine granular Mg-Zn-Nd ternary phases （τ1, τ4） appeared in the as-extruded ZK20+ 0.5% Nd magnesium alloy. It was found that ZK20 showed brittle fracture surface, while the fracture surface of ZK20+0.5%Nd showed a mixed characteristics of brittleness and ductility.

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