Ultrasonic Effects on Microstructure Evolution and Mechanical Properties of AZ80 Magnesium Alloy

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