Abstract
Employing the method of glass fluxing combined with thermal cycling, hypercooling (Δ T hyp) up to 460 K was achieved in the bulk Fe 83B 17 alloy melt. Within the achieved undercooling range, it was found that only one eutectic reaction occurs during rapid solidification. For Δ T hyp < 386 K, α-Fe + tetragonal Fe 2B phases were detected. For Δ T hyp ≥ 386 K, a metastable phase Fe 3B was found directly separating from the undercooled melt and remaining at room temperature. In terms of kinetic and structural analysis, phase selection between the metastable phase, Fe 3B, and the stable phase, Fe 2B, was interpreted. By isothermal annealing of the as-solidified samples subjected to Δ T hyp ≥ 386 K, the metastable–stable transformation correlated with solid-state transformation is investigated.
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