摘要
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 a-Mg phase transforms from coarse dendrites to nearly fine equiaxed grains,and the continuous I-phase atα-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.
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 a-Mg phase transforms from coarse dendrites to nearly fine equiaxed grains,and the continuous I-phase atα-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.
基金
financially supported by the National Great Theoretic Research Project of China(No.2013CB632200)
the Sharing Fund of Chongqing University's Large-Scale Equipment(No.2013063009)
