Effects of Zr on Microstructure and Mechanical Properties of As-extruded Mg-12Gd-4Y-1Zn Magnesium Alloy
Based on the Mg-12Gd-4Y-1Zn test magnesium alloy,the effects of Zr content on microstructure and mechanical properties of the alloy after extrusion were investigated.The results indicate that the addition of 0.6%～1.2%Zr in Mg-12Gd-4Y-1Zn magnesium alloy has no obvious effect on the second phase type in the alloy structure,however the grain size in the alloy containing Zr is decreased,and the grain refinement effect of the alloy adding 0.9%Zr presents desirable.In addition,the addition of 0.6%～1.2%Zr can also significantly improve the room temperature tensile properties of the alloy after extrusion.The tensile strength and yield strength of the alloy with 0.9%Zr content after extrusion are relatively high,while the elongation of the alloy with 1.2%Zr content after extrusion is relatively high.In general,the Mg-12Gd-4Y-1Zn alloy with 0.9%Zr addition shows a better comprehensive mechanical proper-ties after extrusion.
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