超声对AZ80镁合金显微组织演化及力学性能的影响

Ultrasonic Effects on Microstructure Evolution and Mechanical Properties of

摘要:

研究超声处理对AZ80镁合金微观结构演化及力学性能的影响。 研究表明，经超声处理后，初生α-Mg相由粗大的树枝晶变为细小的球状等轴晶，且β-Mg17Al12相明显细化，由连续网状分布变成不连续分布。此外，合金经超声处理后，力学性能得到明显提高，屈服强度、抗拉强度和伸长率分别由87MPa, 118MPa and 2.1% 提高到107MPa、170MPa 和 5.4%。

Abstract:

Ultrasonic effects on microstructure evolution and mechanical properties of AZ80 alloy were investigated. The results indicated that with the application of ultrasonic melt treatment, the primary α-Mg phases were transformed from coarse dendrites to nearly fine equiaxed grains, and the β-Mg17Al12 phases at α-Mg boundaries were refined and modified into discontinuous. Besides, the tensile properties of AZ80 alloy were apparently improved after ultrasonic melt treatment, in which the 0.2% tensile yield strength, ultimate tensile strength and elongation were improved from 87MPa, 118MPa and 2.1% to 107MPa, 170MPa and 5.4%, respectively.