采用熔融玻璃净化和循环过热相结合的方法, 研究了Fe--Co合金在深过冷快速凝固中的亚稳相。结果表明, 当熔体的过冷度达到某一临界数值(?Tcrit)时, 亚稳相(b.c.c)在竞争形核中优先形核生长, 并在随后的冷却过程中保留在凝固组织中。在γ单相区内等温退火3 h后, 亚稳相完全转变为稳定相；在过冷Fe--Co合金的凝固组织中亚稳相是“竞争形核--重熔--γ相外延生长--不完全固态相变”的产物。
The rapid solidification of undercooled Fe--Co alloy was investigated by combining cycle superheating and molten fluxing purification technology. The results show that metastable phase nucleated primarily only when the critical undercooling was achieved. After 3 h isothermal annealing in single phase γ region, metastable phase was transferred to stable phase completely. Finally, metastable phase in as--solidified microstructure of undercooled Fe--Co alloys can be described as a result of “competitive nucleation-- remelting-- extensive growth of γ phase--incomplete solid state transformation”
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