Effect of Al Content on Microstructure and Mechanical Properties of Mg-xAl-3Ca Alloy
A series of Mg-xAl-3Ca(x=10wt.％,20wt.％,30wt.％,40wt.％)and Al-xMg-3Ca(x=17wt.％,27wt.％,37wt.％,47wt.％)alloys were successfully prepared by adding different contents of aluminum(10wt.％～80wt.％)and 3wt.％cal-cium granules to magnesium melt.Optical microscope,scanning electron microscope,X-ray diffractometer and universal testing ma-chine were used to study the microstructure changes and the influence mechanism on the compression properties during the evolution of Mg-Al-Ca alloy to Al-Mg-Ca alloy.The experimental results show that the compressive properties of the alloy can be improved by Al content in a certain range.When the proportion of Al content is less than 30wt.％,the compressive strength of the alloy increases with the increase of aluminum content.When Al content accounted for 30wt.％,Mg17 Al12 in the alloy was connected to each other and formed a network structure,which inhibited the growt.h and movement of the phase,and thus increased the compressive strength of the alloy to 379.43 MPa.When the content of Al exceeds 30wt.％,the embrittlement tendency of the alloy increases due to the presence of a large number of Mg17Al12 and large size Al2Ca phases,so that the compressive strength of the alloy gradually decreases.When the Al content accounted for 50wt.％and 60wt.％,because only a small amount of intermetallic compounds are formed,its compressive strength is lowest.However,when the Al content is 80wt.％,the Al phase in the alloy has high hardness and strength,which can in-crease the compressive strength of the alloy,making the compressive strength of the alloy 438.06 MPa.
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