Effects of GPa-level High Pressure on Solidification Structure and Properties of Mg-3Al Alloy
The solidification structure and properties of Mg-3Al alloy under graphite mold casting(water cooled at 5℃,1 atm(1.01325×105 Pa))and high-pressure solidification(2 and 3 GPa)were studied by XRD,SEM and EDS.The results show that Mg-3Al alloy is composed of α-Mg at different solidification pressures,but its microstructure changes from equiaxed graphite casting to dendritic clusters under high pressure.The GPa-level high pressure can make the Al solute atoms in Mg-3Al alloy more solidly dissolve into the α-Mg matrix,and at the same time,the solute atoms can also be segregated in the form of interdendritic and grain boundary.The compressive strength and hardness of Mg-3Al alloy at 3 GPa are 372 MPa and 46 HV,respectively,which are significantly higher than those of graphite cast Mg-3Al alloy at 356 MPa and 41 HV.
Mg-3 Al alloymicroscopic structurehigh pressure solidificationmechanical properties
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