Effect of Ga Addition on Microstructure and Mechanical Properties of Extruded TAZ811-1Ca Alloy
Taking the as-extruded TAZ811-1Ca alloy as object,the effect of different Ga contents(1wt%,3wt%)on the microstructure and properties of extruded TAZ811-1Ca alloy was studied by optical microscopy(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD)and tensile test at room temperature.The results indicate that the Ga addition can refine the grain of TAZ811-1Ca alloy,and the refinement effect is enhanced with the Ga content increasing.In addition,Ga element can be dissolved in α-Mg matrix resulting in solution strengthening and also promotes the dynamic precipitation of nano-sized Mg2Sn phase during extrusion,which leads to the improvement of alloy mechanical properties.When Ga content is 3wt%,the tensile strength,yield strength and elongation of the extruded alloy reach the optimal values,which are 316.5 MPa,210 MPa and 20.71%,respectively.
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