Co－Sm－Cu合金系中包共析转变Sm_2（Co、Cu）_（17）＋Sm（Co、Cu）_5﹦α－Co（Cu、Sm）＋Sm_2（Co、Cu）_7预测

本文以三元系相平衡规律为理论依据．结合文献资料中有关Ｃｏ－Ｓｍ－Ｃｕ系，Ｃｏ—Ｃｕ系和Ｃｏ－Ｓｍ系相图的实验数据，预测在Ｃｏ－Ｓｍ－Ｃｕ系方Ｃｏ区，约低于温度６００℃处．存在一个三元四相包共析转变：Ｓｍ_２（Ｃｏ、Ｃｕ）_１７十Ｓｍ（Ｃｏ、Ｃｕ）５　α—Ｃｏ（Ｃｕ、Ｓｍ）＋Ｓｍ２（Ｃｏ、Ｃｕ）７这个转变可能会导致相应的钴钐永磁材料的硬田性降低．

PREDICTION ABOU T A PERITECTOID-EU -TECT OED REACT ION IN Co-Sm-Cu SYSTEM

According to the principles of the phase equilibrium in ternary system and usingsome experimental informations in the literatures about Co-Sm-Cu,Co-Cu and Co-Sinphase diagrams,the paper predicls a peritectoid-eutectoid reaction:in a Co-rich region of the Co-Sm-Cu system below about 600'C. The reaction would decrease the hard magnetic preperty of the Co-Sin permanent magnetic materials.