作　　者： ; ; ; ;

机构地区： 上海交通大学材料科学与工程学院金属基复合材料国家重点实验室

出　　处： 《复合材料学报》 2006年第6期120-126,共7页

摘　　要： 系统研究了合金元素Ag对Cu-Fe原位复合材料微观组织、力学性能和导电性能的影响规律。采用熔铸-形变法分别制备了Cu-12 wt%Fe、Cu-14 wt%Fe-1 wt%Ag、Cu-14 wt%Fe-3 wt%Ag和Cu-11 wt%Fe-6 wt%Ag4种原位复合材料。测试了不同应变下材料的抗拉强度和电阻率。采用扫描电镜(SEM)观察了材料的微观组织演变和拉伸断口形貌,用能谱仪(EDS)分析了Fe和Ag在Cu基体中的分布。结果表明,添加Ag可以细化初生的Fe枝晶,强化Cu基体,降低高温下Fe在Cu中的固溶度,材料的强度和电导率同时得到提高。但添加Ag后,材料的塑性变形能力降低,在较低的应变下,拉伸试样的断口就表现出剪切断裂特征。 The effects of Ag on the microstructure and mechanical and electrical properties of Cu- Fe in-situ composites were investigated. Four in-situ composites, Cu-12 wt%Fe, Cu-14 wt%Fe-1 wt%Ag, Cu-14 wt%Fe-3 wt%Ag and Cu-11 wt% Fe-6 wt% Ag were prepared by the cast and drawn process. The ultimate tensile strength and electrical resistivity of the composites at each draw ratio were measured. The microstructure evolution of the composites was investigated using scanning electron microscopy （SEM） and distribution of Fe and Ag in the matrix was analyzed by EDS equipped on SEM. The results show that the presence of Ag can refine the primary Fe dendrites and reduce the solution of Fe in Cu at high temperature as well, which leads to the simultaneous increment in both strength and conductivity. However, the Cu-Fe-Ag composites show a bit lower plasticity and the fracture surfaces exhibit shear characteristic at a lower draw ratio.

关 键 词： 原位复合材料 微观组织 强度 电导率

领　　域： [一般工业技术]