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Effect of Mg-30Zr Addition and Stir Processing on Microstructure of WE43 Alloy

YIN Dong-song;XIE Wei-sheng;YU Xian-xian;LIU Jun;MENG Fan-qi;YANG Guang-shan;School of Materials Science and Engineering, Harbin Institute of Technology;Avic Harbin Dongan Engine (Group) Corporation Ltd.;School of Materials Science and Engineering, Heilongjiang University of Science and Technology;  
The effect of Zr addition(1.8wt.%-3.6wt.%) and the time of stir processing on microstructure of WE43 alloy were investigated. The results show that the grain size decreases obviously when the Zr addition is1.8wt%. With the addition amount increasing, the grain size of Zr decreases. The optimal refining effect can be obtained when the Zr addition amount is 3.6wt%. With the increase of stir processing time, the grain size of Zr decreases obviously. The refining effect is optimal when the stir processing time is 15-20 min. The refining effect becomes unfavorable when the stir processing time exceeds 20 min. The solid solubility at the grain boundary of WE43 increases obviously with the increase of Zr content, which produces no effect in the interior of the grains. Mg-Y and Mg-Nd phases can be observed at the grain boundary of WE43, and with the increase of Zr content, Mg-Y and Mg-Nd phases become fine. Zr can refine microstructure of WE43 due to the heterogeneous nucleation effect by Zr.
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