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本文用金相、差热、电子探针和X射线衍射分析研究了Fe—Ce二元系。Fe—Ce二元系存在两种中间相:Fe_2Ce和Fe_(17)Ce_2,Fe_2Ce为MgCu_2型立方结构,Fe_(17)Ce_2为Th_2Zn_(17)型菱形结构,两种中间相都是包晶反应形成的,熔化温度分别为925℃和1063℃。存在一个共晶反应:L→Fe_2Ce+Ce,共晶成分为92.6W/OCe(88.3a/O Ce),共晶温度为592℃、850℃,900℃时,Ce在α—Fe中的固溶度约小于0.1W/O Ce。由于Ce的加入—Fe→γ—Fe转变温度提高到1399℃,γ—Fe→α—Fe转变温度提高到922℃。其转变很可能为包析反应:γ—Fe+Fe_(17)Ce_2→α—Fe。α—Fe的居里点下降为752℃。
In this paper, Fe-Ce binary system has been studied by metallography, differential thermal analysis, electron probe and X-ray diffraction. There are two kinds of mesophases in Fe-Ce binary system: Fe_2Ce and Fe_ (17) Ce_2, Fe_2Ce is MgCu_2 type cubic structure, and Fe_ (17) Ce_2 is Th_2Zn_ (17) type diamond structure. Formed, the melting temperatures were 925 ° C and 1063 ° C, respectively. There is a eutectic reaction: L → Fe 2 Ce + Ce, the eutectic composition is 92.6W / OCe (88.3a / O Ce), the eutectic temperature is 592 ℃, the solidification of Ce in α-Fe at 850 ℃ and 900 ℃ The solubility is less than about 0.1 W / O Ce. As the addition of Ce-Fe → γ-Fe transition temperature increased to 1399 ℃, γ-Fe → α-Fe transition temperature increased to 922 ℃. The transformation is likely to be the inclusion reaction: γ-Fe + Fe_ (17) Ce_2 → α-Fe. The Curie point of α-Fe decreased to 752 ℃.