Effect of Ca Content on Microstructure and Properties of As-Aged Mg-6.5Al-xCa-1Sn-0.3Sr Magnesium Alloys
The effect of Ca content on the microstructure and properties of as-aged Mg-6.5Al-xCa-1Sn-0.3Sr(x=1,1.5,2,2.5)magnesium alloys were investigated by XRD,SEM and properties tests.The results showed that as-aged alloys mainly consist of α-Mg and Al2Ca phases,the addition of Ca causes the Al2Ca phase in as-aged alloys to coarsen into a network.The tensile strength and elongation of as-aged alloys gradually decreased with the addition of Ca,when the Ca content was 1.0wt.%,the tensile properties of as-aged alloys were the best,but the hardness of as-aged alloys increased with the addition of Ca.At 175℃,70 MPa,the steady-creep rate of as-aged alloys were reduced with Ca addition.
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