Effects of Heat Treatment on Microstructure and Properties of Mg-Gd-Y-Zn-Ti Alloy
Effects of heat treatment on microstructure,micro-composition,phase composition and mechanical proper-ties of Mg-12Gd-x Y-1Zn-0.6Ti alloy(x=0,0.4,0.8,1.2,%)were analyzed at as-cast,solid solution and aged treat-ment by X-ray diffractometer(XRD),scanning electron microscopy(SEM)with energy spectrum and electron tensile testing machine.The results indicate that LPSO phase is present in as-cast Mg-12Gd-x Y-1Zn-0.6Ti alloy,which is composed of Mg12Gd5(Zn,Y).The mechanical properties of alloy with 0.8%Y is desirable,where the tensile strength,yield strength and elongation reach 222 MPa,149 MPa,and 3.76%,respectively.The mechanical properties of alloy after solution treatment are improved to a certain extent,where the tensile strength,yield strength and elongation reach 272 MPa,188 MPa,and 5.4%,respectively.The peak aging response of alloy with Y addition is strong,and the mechanical properties of peak-aged Mg-12Gd-0.8Y-1Zn-0.6Ti are desirable,where the tensile strength reach yield strength and elongation are 388 MPa,267 MPa and 6.44%,respectively.
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