Effect of Al and Zn element addition on microstructure and mechanical properties of Mg-Cu alloy
Effect of Al and Zn elements alone or simultaneously added on microstructure and mechanical properties of Mg-Cu alloy was studied using scanning electron microscopy,energy dispersive spectroscopy analysis,X-ray diffraction,hardness testing and tensile testing.The results show that compared with the as-cast alloys,the mechanical properties of the three alloys treated with T6 are significantly improved.Among them,the mechanical properties of the Mg-1Cu-1Zn alloy have been improved the most,with the yield strength of 176.6 MPa,the tensile strength of 267.9 MPa and the elongation of 14.1％after heat treatment,which are 58.1％,41.6％,and 40.7％higher than that of the as-cast Mg-1Cu-1Zn alloy,respectively.After T6 treatment,most of the second phases on the grain boundaries of the Mg-1Cu-1Zn alloy with only Zn added have been dissolved into the matrix,and spherical precipitates have been formed within the grains.Analysis confirms that these two phases are MgZnCu and Mg(Zn,Cu)2.The reason for the improvement of mechanical properties of the alloys is the combined effect of various factors such as solution strengthening and aging strengthening.
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