The mechanical properties,the second phase morphology and composition of Mg-13Gd-4Y-2Zn-0.5Zr alloy after solid solution treatment were analyzed by universal tensile testing machine,SEM,EDS and XRD,and the second phase volume fraction was counted using Image-Pro-Plus software.The results show that after solid solution treatment,the alloy still has a large number of different forms and components of the second phase,mainly gray bulk LPSO phase,gray rod LPSO phase and white dot rich rare earth phase.With the increase of solution time,the change of tensile strength and elongation of Mg-13Gd-4Y-2Zn-0.5Zr alloy first decrease and then rise.Solution at 510℃for 16 h,the tensile strength and elongation of the alloy reaches the minimum of 196.77 MPa and 3.8%,respectively.Solution at 510℃for 10-16 h,LPSO phase volume fraction is unchanged,RE-rich phase volume fraction increases.The rare earth-rich phase is brittle in texture,and it is easy to break when stressing,which becomes the source of crack germination and propagation,which reduces the tensile strength and elongation of the alloy.Solution at 510℃for 16-19 h,the volume fraction of rare earth-rich phase decreases and the mechanical properties of the alloy increase.
Mg-13Gd-4Y-2Zn-0.5Zr alloysolution timethe second phasevolume fractionmechanical properties
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