Effects of Cryogenic Treatment on Microstructure and Tensile Properties of Mg-2Zn-0.5Y Alloy
The extruded Mg-2Zn-0.5Y alloy was subjected to cryogenic treatment at different time.The effects of cryogenic treatment at different time on the microstructure and tensile properties of Mg-2Zn-0.5Y alloy were studied by OM,SEM,XRD and tensile test.The results show that the microstructure of as extruded Mg-2Zn-0.5Y alloy is mainly composed ofα-Mg and a small amount of W phase.With the increase of cryogenic time,the grain size of Mg-2Zn-0.5Y alloy has no obvious change,and the precipitation amount of W phase increases gradually.The volume fraction of W phase in Mg-2Zn-0.5Y alloy is 5.33vol％after cryogenic for 12 h.Cryogenic treatment has no obvious effect on the tensile strength of Mg-2Zn-0.5Y alloy,but can significantly improve the plasticity of the alloy.The elongation of Mg-2Zn-0.5Y alloy after cryogenic treatment for 1 h is 17.4％,which is 142％higher than that of extruded alloy.
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