Effects of Ca on Microstructure and Mechanical Properties of Mg-5.5Al-1.2Y Alloy
The effects of Ca on the microstructure and mechanical properties of Mg-5.5Al-1.2Y alloy were investigated by OM,SEM,EDS and XRD.The results show that adding appropriate addition of Ca into Mg-5.5Al-1.2Y alloy can reduce the quantity of β-Mg17Al12 phase,refine Al2Y phase and cause the formation of high-melting-point phase Al2Ca and Al4Ca in the matrix.With the increase of Ca addition,the mechanical properties of the alloy at room and elevation temperature(150 ℃ and 175 ℃) increase and then decrease,which can reach the peak at the alloy with 0.8%Ca.