Effect of Al on microstructure and tensile properties of Mg-Zn-Y alloy
Effect of Al on microstructure and tensile properties of as-cast Mg95Zn4Y1 alloy was investigated.The results show that the grains of the Mg95Zn4Y1 alloy show a trend of first refining and then coarsening with the increase of Al content.The grain size of the primary α-Mg phase in the Mg94.7Zn4Y1Al0.3 alloy is the smallest,with an average secondary dendrite arm spacing of 31.9 μm,which is decreased by 28.6%compared to the Mg95Zn4Y1 alloy.The addition of Al is beneficial for the precipitation of I-phase in the alloy.With the increase of Al content,the tensile properties of the alloy show a trend of first increasing and then decreasing.The Mg94.7Zn4Y1Al0.3 alloy exhibits the best room temperature tensile properties,with ultimate tensile strength and elongation of 211 MPa and 9.7%,respectively,which are 28.7%and 27.6%higher than those of the Mg95Zn4Y1 alloy.
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