(1. 北京科技大学 材料先进制备技术教育部重点实验室，北京 100083；
2. 北京科技大学 现代交通金属材料与加工技术北京实验室，北京 100083)
摘 要: 研究Fe含量(1.05%~2.44%，质量分数)对CuNi10FeMn1合金组织、微观偏析、耐海水冲刷腐蚀性能和力学性能的影响，采用SEM、能谱和XPS等手段分析合金的腐蚀产物膜。结果表明：CuNi10FeMn1合金中Ni、Fe元素易于富集在枝晶干，Mn元素易于富集在枝晶间；随着Fe含量的增加，合金组织明显细化，α固溶体中的Fe含量增加；当Fe含量从1.05%增大至1.80%时，Ni、Fe元素的偏析比分别由0.49和0.45增大到0.77和0.61，偏析程度下降；当Fe含量继续增大时，Ni、Fe元素的偏析比则下降为0.62~0.65和0.49~0.51，偏析程度也随之增加。随着Fe含量的增加，合金的腐蚀速率呈先减小后增大的趋势，当Fe含量为1.80%时，合金腐蚀速率最小，表面形成致密的、缺陷较少的富Fe、Ni的腐蚀产物膜，对基体的保护作用增强，是其具有良好耐海水冲刷腐蚀性能的主要原因。随着Fe含量的增加，CuNi10FeMn1合金的抗拉强度和屈服强度由Fe含量为1.05%时的245和90 MPa分别增大到Fe含量为2.44%时的303和151 MPa，而断后伸长率由39.2%下降到32.8%。
关键字: CuNi10FeMn1合金；Fe含量；微观偏析；冲刷腐蚀性能
（1. Key Laboratory for Advanced Materials Processing, Ministry of Education,
University of Science and Technology Beijing, Beijing 100083, China;
2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract:The effects of Fe content (1.05%-2.44%, mass fraction) on the microstructure, segregation, corrosion behavior in simulated flowing seawater and mechanical properties of the CuNi10FeMn1 alloy were investigated; and SEM, EDX and XPS were used to analyze the corrosion film of the alloy. The results show that Ni and Fe elements tend to be enriched in the dendritic region and Mn element tends to be enriched in the interdendritic region. With increasing Fe content, the microstructure refines obviously, Fe content in α solid solution increases. When the Fe content increases from 1.05% to 1.80%, the segregation ratios of Ni and Fe increase from 0.49 to 0.77 and from 0.45 to 0.61, respectively; and the segregation degree of Ni and Fe elements decreases. With further increasing Fe content, the segregation ratios of Ni and Fe decrease to 0.62-0.65 and 0.49-0.51, respectively; and the segregation degree of Ni and Fe elements increases. With the increase of Fe content, the corrosion rate of the alloy initially decreases, and then increases. When Fe content is 1.80%, the corrosion rate reaches to the minimum, dense, and the less-defect corrosion films containing rich Ni and Fe elements form on the surface of the alloy during immersion in simulated flowing seawater in order to effectively protect the α-matrix, which contributes to good flushing corrosion resistance of the alloy in seawater. With the Fe content increasing from 1.05% to 2.44%, the tensile strength of the alloy increases from 245 to 303 MPa, the yield strength increases from 90 to 151 MPa, while the elongation to failure decreases from 39.2% to 32.8%.
Key words: CuNi10FeMn1 alloy; Fe content; segregation; flushing corrosion resistance
