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采用熔融玻璃净化法，在Ｆｅ－３０Ｃｏ（原子分数，％，下同）合金中获得了３０８Ｋ的过冷度，借助光学显微镜和透射电子显微镜观察了过冷度与组织演化的关系以及ｂｃｃ亚稳相的微观结构确定了在深过冷条件下，Ｆｅ－３０Ｃｏ合金形成亚稳相的临界过冷度，从过冷熔体枝晶生长的角度分析了ｂｃｃ亚稳相和ｆｃｃ稳定相的生长速度和过冷度的关系，并从热力学的角度讨论了亚稳相形成的条件及影响亚稳相形成的热力学因素
The undercooling of 308K was obtained in molten Fe-30Co (atomic fraction,%, the same below) using the molten glass purification method. The relationship between the undercooling and microstructure evolution and the bcc metastable state were observed by optical microscope and transmission electron microscope The microstructure of the phase determines the critical undercooling of the metastable phase of the Fe-30Co alloy under deep subcooling. The growth rates of the metastable bcc phase and the stable phase of fcc are analyzed from the viewpoint of the growth of dendrites in the undercooled melt And the relationship between subcooling degree, and discussed the formation conditions of metastable phases and the thermodynamic factors that affect the formation of metastable phases from the thermodynamic point of view