Effect of aging temperature on microstructure and properties of Mg-2.0Zn-1.0Y-0.5Zr alloy
Microstructure,corrosion resistance and mechanical properties of solution treated Mg-2.0Zn-1.0Y-0.5Zr alloy aged at 180-220℃ for 12 h were studied by means of scanning electron microscopy(SEM),X-ray diffraction(XRD),tensile test,immersion test and electrochemical test.The results show that as the aging temperature increases from 180℃ to 220℃,the number of granular second phases precipitated in the alloy increases,and the volume fraction of the second phase increases from 0.03%(solution treated)to 0.36%(aged at 220℃ for 12 h).The mechanical properties of the alloy are significantly improved,but the corrosion resistance decreases.When the aging temperature is 200℃,the comprehensive properties of the alloy are better,with tensile strength,yield strength,elongation and corrosion rate of(268.1±11.3)MPa,(170.4±8.5)MPa,(15.8±0.6)%and(0.575±0.039)mm/y,respectively.
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