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在Mg93Zn6Y1合金凝固过程中施加脉冲磁场处理,主要研究了放电电压对Mg93Zn6Y1合金组织和力学性能的影响。结果表明,施加脉冲磁场对Mg93Zn6Y1合金凝固组织中的初生α-Mg相和准晶相均具有显著的细化效果。随着放电电压的增加,初生α-Mg相尺寸逐渐减小,其形貌由粗大枝晶状逐步转变为细小花瓣状和颗粒状。同时,准晶相也得到逐步细化,其形貌由粗大的连续网络状转化为不连续状和颗粒状,平均宽度和平均面积比分别由26μm和32%减小至10μm和14%。随着放电电压的增加,Mg93Zn6Y1合金的力学性能显著提高。当放电电压为300V时,Mg93Zn6Y1合金的抗拉强度和伸长率分别为172.1 MPa和1.6%,相比未处理合金提高了71.2%和60.0%。
In the process of solidification of Mg93Zn6Y1 alloy, pulsed magnetic field was applied to study the effect of discharge voltage on microstructure and mechanical properties of Mg93Zn6Y1 alloy. The results show that the pulsed magnetic field has a significant refining effect on the primary α-Mg phase and the quasicrystalline phase in the solidified microstructure of Mg93Zn6Y1 alloy. With the increase of discharge voltage, the size of primary α-Mg phase decreases gradually, and its morphology changes gradually from coarse dendrite to fine petal and granular. At the same time, the quasicrystal phase is also gradually refined, its morphology from coarse continuous network into discontinuous and granular, the average width and average area ratio decreased from 26μm and 32% to 10μm and 14%. With the increase of discharge voltage, the mechanical properties of Mg93Zn6Y1 alloy increase significantly. When the discharge voltage is 300V, the tensile strength and elongation of Mg93Zn6Y1 alloy are 172.1 MPa and 1.6%, respectively, which are increased by 71.2% and 60.0% compared with the untreated alloy.