摘要
通过冷拉拔制备了纤维相增强的Cu-12%Ag合金(质量分数),研究了纤维组织形成过程及变形程度对合金电导率的 影响,讨论了影响电导率的机制并建立了分析模型.随着变形程度的增加,共晶体演变成细密的纤维柬结构,电导率降低.合金导 电主要依赖于Cu基体而非共晶体,共晶纤维束与Cu基体界面间距随应变率增大而减小是合金导电性能下降的主要因素.根据 界面散射模型建立了电阻率与变形程度之间的函数关系,可预测不同应变条件下合金的导电性能.
Cu-12%Ag (mass fraction) filamentary composite was prepared by heavy cold drawing. The evolution of filamentary microstructure and the effect of strain level on the electrical conductivity of the composite were investigated. The mechanism responsible for the electrical conductive behavior was discussed. With increasing draw ratio, the original eutectic colonies develop into fine fibrous bundles and the electrical conductivity decreases. Electrical conduction of the composite depends mainly on the Cu matrix instead of eutectic fibrous bundles. The conductive loss with strain enhancement can mainly be attributed to the reduction of interfacial spacing between the Cu matrix and eutectic fibrous bundle. The quantitative relationship between the electrical resistivity and draw ratio was derived on the basis of a size-effect model and can be utilized to predict the electrical conductive level of the composite under different strain conditions.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第3期255-259,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金项目50371076及高等学校博士学科点专项科研基金项目20020335014资助
关键词
Cu—Ag合金
纤维组织
电导率
应变率
Cu-Ag alloy
filamentary microstructure
electrical conductivity
strain ratio