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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、MgZn_2相、MgSnY相、Mg_2Sn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 ultrasonic treatment on the microstructure and mechanical properties of Mg-6Zn-0.5Y-2Sn alloy were studied. The results show that the ultrasonic treatment has a significant effect on the microstructure and mechanical properties of Mg-6Zn-0.5Y-2Sn alloy. The Mg-6Zn-0.5Y-2Sn alloy consists of α-Mg phase, MgZn_2 phase, MgSnY phase, Mg_2Sn phase and a small amount of I phase. After ultrasonic treatment, the phase I basically disappeared, and with the increase of ultrasonic power, the coarse dendrite structure gradually becomes a round equiaxed crystal, located in the grain boundary near the coarse, semi-continuous, uneven distribution of the second phase gradually Becomes fine, discontinuous, uniform and diffusely distributed. When ultrasonic power reaches 700 W, the mechanical properties of Mg-6Zn-0.5Y-2Sn alloy are optimized. The yield strength, ultimate tensile strength and elongation were increased by 28%, 30% and 67%, respectively, compared with the non-sonicated magnesium alloy.