The three-dimensional morphologies of the Fe-bearing intermetallics in a semisolid-processed Al-Mg-Si alloy were examined after extracting the intermetallics. a c -AlFeSi and b-AlFeSi are the major Fe-bearing intermetallics. Addition of Al-Ti-B grain refiner typically promotes b-AlFeSi formation. b-AlFeSi was observed with a flat, plate-like morphology with angular edges in the alloy with and without grain refiner, whereas a c -AlFeSi was observed as ''flower''-like morphology in the alloy with grain refiner.

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