Microstructure and Properties of Novel Mg-4Li-xCa Alloy

Author of the article:ZHANG Kaiwang1 , ZHANG Qiang1 , SHI Xintai1 , CHAI Donglang2 , YAN Jinru1

Author's Workplace：1. N0.16 Institute of No.9 Academe of China Aerospace Technology Corporation, Xi’an 710100, China; 2. Xi’an Jiaotong University, Xi’an 710049, China

Key Words：microstructure; solidification process; Mg2Ca; mechanical properties

Abstract：A new type of Mg-4Li-xCa (x=0.3~1.5%) alloy was designed and prepared. The microstructure of the alloy with different Ca contents was studied by SEM and XRD, and the solidification process of the alloy was analyzed. The effects of the addition of B and Y elements on the microstructure and mechanical properties of the alloy were discussed. The results show that, for Mg-4Li-xCa (x =0.3~1.5% ) alloy, when containing Ca content of 1% or less, the microstructure is for single-phase α-Mg, when Ca content is 1.5%, the eutectic microstructure is (α+Mg2Ca). The effect of Y on the fine grain strengthening of the alloy is significant, and the strength and elongation of the alloy can be improved simultaneously. The tensile strength and elongation of the alloy with 0.5%B can reach 250 MPa and 6.7%, respectively