Effect of Ultrasonic Treatment on the Microstructure
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Key Words：Magnesium alloy; Melting; Ultrasonic treatment; Grain refinement
Abstract：Compared to the sample without ultrasonic treatment, it was found that, for AZ31 magnesium melt alloy treated by ultrasonic, the refined grain size and the inproved distribution of grain with its shape of ovalshaped or spherical can be obtained, and the precipitation inside Al matrix was inhibited The Mg17Al12 precipitates distributed mainly along the grain boundary and hardness was improved remarkedly. Moreover, the optimized treatment processing on power and time were studied, which gave evidence for the casting application by ultrasonic.
