PURIFICATION AND HYPERCOOLING OF Fe-B EUTECTIC ALLOY

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 un- dercooling and hypercooling were given out.The hypercoolings of 300——460 K have been obtained successfully in bulk Fe_(83)B_(17)eutectic alloy melts,and 485 K in Fe_(80)B_(20)hypereutectic alloy melts.So the primary nucleation undercoolings of 0.3T_m—0.4T_m 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.