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合金的凝同组织中亚稳相是"竞争形核-重熔-γ相外延生长-不完全固态相变"的产物.
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