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By cyclic superheating incorporated with glass fluxing denucleation method the Fe82B17Si1 eutectic alloy was undercooled up to △T = 342 K. The relations between recalescence behavior and solidification structures were systematically studied in the undercooling range of 6-342 K. Two critical undercoolings were observed: mixed eutectic was the unique growth morphology when the undercooling was less than △T1 =63 K; but the microslructure transformed to complete undercooled anomalous eutectic when the undercooling was greater than △T2 = 164 K. The two eutectic phases a(Fe,Si) and Fe2B conformed to the non-reciprocal nucleation effect. The boundary of the coupled zone of a (Fe,Si)-Fe2B system shifted toward the Fe2B side, and intersected the eutectic composition line at △T= 154 K and △T = 264 K, whose valley was at about △T = 207 K.
By cyclic superheating incorporated with glass fluxing denucleation method the Fe82B17Si1 eutectic alloy was undercooled up to ΔT = 342 K. The relations between recalescence behavior and solidification structures were systematically studied in the undercooling range of 6-342 K. Two critical undercoolings were observed: mixed eutectic was the unique growth morphology when the undercooling was less than ΔT1 = 63 K; but the microstructural transformation to complete undercooled anomalous eutectic when the undercooling was greater than Δ T2 = 164 K. The two eutectic phases a (Fe, Si) and Fe2B conformed to the non-reciprocal nucleation effect. The boundary of the coupled zone of a (Fe, Si) -Fe2B system shifted toward the Fe2B side, and intersected the eutectic composition line at ΔT = 154 K and ΔT = 264 K, whose valley was at about ΔT = 207 K.