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中文摘要：
提出了一个极限固溶体合金的团簇模型,在此基础上优化设计了添加Fe和Mn的Ni30Cu70（原子分数,%）固溶体合金成分.在该模型中,固溶的Fe和Mn以Ni为第一近邻形成12配位立方八面体原子团簇（Fe1-xMnx）Ni12而分散到Cu基体中,因此极限固溶体合金成分为[M1/13Ni12/13]30Cu70）=[（Fe1-xMnxNi12]Cu30.3,M=（Fe1-xMnx）.采用X射线衍射和电化学腐蚀测试等方法,研究了[（Fe1-xMnxNi12]Cu30.3合金的微观组织与耐腐蚀性能的关系.实验结果表明,对应于极限固溶体状态的[（Fe0.75Mn0.25Ni12]Cu30.3合金,在3.5%NaCl溶液中具有相对好的耐腐蚀性能.
英文摘要：
Minor Fe and Mn additions are necessary to enhance the corrosion resistance of commercial Cu-Ni alloys. The present paper aims at optimizing the addition amounts of Fe and Mn in Cu70Ni30 （atomic fraction, %） alloy using a cluster-based solid solution model. In this model it assumed that one Fe（Mn） atom and twelve Ni atoms formed a cluster consisted of Fe（Mn） centered and Ni-urrounded cube-octahedron and the limit solid solution would be composed of isolated Fe（Mn）Nil2 clusters embedded in the Cu matrix. The ratio of the Fe（Mn） atoms and its surrounding Ni atoms is 1 ： 12, and the limit solid solution composition of Fe（Mn）-modified Cu70Ni30 alloy is [M1/13Ni12/13]30Cu70）=[（Fe1-xMnxNi12]Cu30.3,M=（Fe1-xMnx）. The OM, XRD and electrochemical corrosion measurements were used to characterize the microstructure and corrosion resistance performance of [（Fe1-xMnxNi12]Cu30.3. The results indicated that the solid solubility limitative alloys [（Fe0.75Mn0.25Ni12]Cu30.3 has the best corrosion resistance in 3.5%NaCl aqueous solution.
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