研究超声处理对Mg?6Zn?0.5Y?2Sn合金显微组织及力学性能的影响。结果表明，超声处理对 Mg?6Zn?0.5Y?2Sn合金显微组织及力学性能有显著影响。Mg?6Zn?0.5Y?2Sn合金是由α-Mg相、MgZn2相、MgSnY相、Mg2Sn 相和少量 I 相组成。经超声处理后，I 相基本消失，并且随着超声功率的提高，粗大的枝晶结构逐渐变成圆整的等轴晶，位于晶界附近粗大、半连续、不均匀分布的第二相逐渐变得细小、不连续、均匀且弥散分布。当超声功率达到700 W时，Mg?6Zn?0.5Y?2Sn合金的综合力学性能达到最佳。与未超声处理的镁合金相比，其屈服强度、极限抗拉强度和伸长率分别提高了28%、30%和67%。
The effects of the ultrasonic treatment on the microstructure and mechanical properties of Mg?6Zn?0.5Y?2Sn alloy were investigated. The results show that the ultrasonic treatment has significant effect on the microstructure and mechanical properties of Mg?6Zn?0.5Y?2Sn alloy. The phases in Mg?6Zn?0.5Y?2Sn alloy are α-Mg, MgZn2, MgSnY, Mg2Sn, and a small amount of I-phase. With the application of ultrasonic treatment, I-phase nearly disappears, and with increasing the ultrasonic treatment power, the coarse dendrites gradually change into roundish equiaxed grains. The second phases at the α-Mg boundaries transform from coarse, semicontinuous and non-uniform to fine, discontinuous, uniform and dispersive. When the ultrasonic treatment power is 700 W, the best comprehensive mechanical properties of Mg?6Zn?0.5Y?2Sn alloy are obtained. Compared with the untreated alloy, the 0.2%tensile yield strength, ultimate tensile strength and elongation are improved by 28%, 30%and 67%, respectively.
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