The microstructures and properties of AZ91D magnesium alloy with Mg-50%TiB2(mass faction) and Ca were studied using SEM,EDS and XRD.It is found that combining addition of 0.7%TiB2 and 0.1%Ca to AZ91D magnesium alloy leads to the α-Mg grain size decreasing from 240 to 46 μm.Based on the EDS test results and calculation of the planar disregistry between TiB2 and α-Mg,TiB2 particles can act as the heterogeneous nucleus of primary α-Mg phase.Ca is pushed onto the solid/liquid interface and enriched at grain bou...
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