Abstract:After isothermally treated at 660°C for 20 min, both dendritic Mg 2 Si in unmodified alloys and polyhedral ones in KBF 4 -modified alloys transformed to nearly globular morphology, while the degree of spheroidization in KBF 4 -modified alloy was lower than that in unmodified alloy. This result might be attributed to both restriction effect of boron and stability of octahedral primary Mg 2 Si crystals. After isothermal treatment at 660°C for 20 min, however, the initial grain sizes of dendritic Mg 2 Si crystals… Show more
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