Abstract
Ultrasonic effect on microstructure evolution and mechanical properties of Mg–6Zn–0.5Y magnesium alloy was investigated. The results show that ultrasonic treatment can significantly modify the as-cast microstructure of Mg–6Zn–0.5Y alloy. With the application of ultrasonic treatment, the primary α-Mg phase transforms from coarse dendrites to nearly fine equiaxed grains, and the continuous I-phase at α-Mg boundaries is modified into discontinuous one. Interestingly, the area fraction of I-phase decreases after ultrasonic treatment. Besides, the tensile properties of Mg–6Zn–0.5Y alloy are apparently improved after ultrasonic treatment. Compared to those of the untreated alloy, the ultimate tensile strength and elongation of Mg–6Zn–0.5Y alloy are improved by 67 % and 56 %, respectively.
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