Abstract
The inoculation effect of Al2Ca intermetallic compound on microstructure evolution was examined performed on as-cast AZ31 and AZ61 alloys. The refinement mechanism of Mg-Al alloys was discussed with the Miedema model and edge-to-edge matching model. Al2Ca compound has a good crystallographic matching relation with Mg matrix, which formed in the solidification process. It is considered that Al2Ca can act as a potential and effective heterogeneous nucleation center. The results reveal that the grain refinement effect of Al2Ca compound has more pronounced in AZ31 alloy compared with in AZ61 alloy.
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