Abstract Adopting the molten glass denucleating technology combined with high frequency vacuum melting, and cycle superheating, the main factors affecting purifying of the bulk Fe-rich side Fe-B eutectic alloy melt were investigated. The optimized purification and parameters for high undercooling and hypercooling were given out. The hypercoolings of 324K～460K have been obtained successfully in bulk Fe83B17 eutectic alloy melts, and 485K in Fe80B20 hypereutectic alloy melts. So the primary nucleation undercoolings of (0.3～0.4) Tm were obtained in bulk Fe-B eutectic system alloy melts. The thermodynamic characters of hypercooling rapid solidification were also discussed by analyzing the cooling curves.
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