脉冲磁场对Mg-Zn-Y合金组织及力学性能的影响

Effects of Pulsed Magnetic Field on Microstructure and Mechanical Properties of Mg-Zn-Y Alloy

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%。

Pulsed magnetic field（PMF）was introduced to treat melt during solidification of Mg93Zn6Y1 alloy.Effects of discharging voltage on microstructure and mechanical properties of Mg93Zn6Y1 alloy were investigated.The results show that the primaryα-Mg and quasicrystal icosahedral phase（I-phase）in the alloy can be refined by PMF treatment.With increasing in discharging voltage,the primaryα-Mg and I-phase are further refined.With discharging voltage of 300 V,the morphology of primaryα-Mg is transformed from the developed dendrite to fine rosette and particle,and I-phase is converted from coarse continuous net-like structure into discontinuous structure or particle.At the same time,the average width and average area ratio of I-phase are reduced from 26μm and 32%to 10μm and 14%,respectively.The tensile strength and elongation of Mg93Zn6Y1 alloy treated by PMF with 300 Vreach 172.1MPa and 1.6%,respectively,which are increased by 71.2% and 60.0%,respectively,compared with those of the alloy without PMF treatment.