含Fe和Mn的Ni_(30)Cu_(70)固溶体团簇模型与耐蚀性研究  

STUDY ON THE CLUSTER-BASED MODEL OF Ni_(30)Cu_(70) SOLID SOLUTION WITH Fe AND Mn AND ITS CORROSION RESISTANCE

作　　者：张杰[1] 王清[1] 王英敏[1] 董闯[1] 

机构地区：[1]大连理工大学三束材料改性教育部重点实验室,大连116024

出　　处：《金属学报》2009年第11期1390-1395,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50671018和50631010;国家重点基础研究发展计划项目2007CB613902;国家高技术研究发展计划项目2007AA05Z102资助~~

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Ni_(30)Cu_(70)(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(Fe_(1-x)Mn_x)Ni_(12)而分散到Cu基体中,因此极限固溶体合金成分为[M_(1/13)Ni_(12/13)]_(30)Cu_(70)=[(Fe_(1-x)Mn_x)Ni_(12)]Cu_(30.3),M=(Fe_(1-x)Mn_x).采用X射线衍射和电化学腐蚀测试等方法,研究了[(Fe_(1-x)Mn_x)Ni_(12)]Cu_(30.3)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[(Fe_(0.75)Mn_(0.25))Ni_(12)]Cu_(30.3)合金,在3.5%NaCl溶液中具有相对好的耐腐蚀性能.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.

关 键 词：CU-NI合金 Fe(Mn)添加 固溶体模型 团簇结构 耐腐蚀性能 

分 类 号：TG111[金属学及工艺—物理冶金] TG146[金属学及工艺—金属学]