【摘要】 利用液态 Ｘ射线衍射仪对 Ｆｅ－４．３０Ｃ合金和 Ｆｅ－４．３０Ｃ－０．４０Ｃｅ合金的液态结构进行了研究，结果表明在 １４７３—１６７３ Ｋ的范围内液态 Ｆｅ－Ｃ共晶合金的最近邻距离约为 ０．２５９—０．２６０ ｎｍ；Ｇａｕｓｓ分解说明液态 Ｆｅ—Ｃ合金含有类面心立方结构的单元，当合金中含有质量分数为０．４％的 Ｃｅ时，其最近邻距离明显增大，约为 ０．２６９—０．２７１ｎｍ，而且在液态 Ｆｅ－４．３０Ｃ－０．４０Ｃｅ合金结构因子Ｓ（Ｑ）曲线的小Ｑ处有一较明显的预峰，分析表明这与液体合金中类面心立方结构的 Ｆｅ－Ｃｅ原子团有关．更多还原

【Abstract】 The liquid structures of Fe-4.30C and Fe-4.30C-0.40Ce alloys are studied by θ-θ X-ray diffractometer. The nearest-neighbor distance in Fe-4.30C alloy is 0.259-0.260 nm at 1473- 1673 K, which shows that the liquid Fe-4.30C alloy has fcc-like structure unit according to the Gauss separation of radial distribution function. At the same temperature, the nearest-neighbor distance increased to 0.269-0.271 nm for liquid Fe-4.30C-0.40Ce alloy. There is a pre-peak on the structure factor S(Q), which relates to the Fe-Ce cluster.更多还原