某些因素对Cu-Ag合金原位复合材料的结构和性能的影响  

Influences of Some Factors on Structure and Properties of the Cu-Ag Alloy in situ Composites

作　　者：宁远涛[1] 张晓辉[1] 吴跃军[1] 

机构地区：[1]昆明贵金属研究所,云南昆明650106

出　　处：《贵金属》2008年第1期19-25,共7页Precious Metals

基　　金：国家自然科学基金资助项目(50371031)

摘　　要：制备了具有不同Ag含量的Cu-Ag合金及其原位纤维复合材料,增加Ag含量可以细化铸态组织和Ag纤维尺寸,增大合金的极限拉伸强度和电阻率。但当Ag含量>20%,这种对组织细化和性能影响的趋势减小。研究了凝固条件、微量稀土添加和中间热处理等冶金学因素对低Ag含量的Cu-Ag合金及其原位纤维复合材料的结构和性能的影响,获得了具有拉伸强度σb>1.5GPa和导电率γ>60%IACS的Cu-Ag合金原位纤维复合材料。讨论了大变形Cu-Ag合金原位纳米纤维复合材料所显示的两阶段应变强化效应及其机制。The Cu -Ag alloy in situ filamentary composites with different Ag contents were prepared. The scales of the microstructure in the as - cast alloys and the Ag filament in the composites were refined, and the ultimate tensile strength （ UTS ） and the electrical resistivity of the composites were increased as the Ag contents increasing. The influences of some metallurgical factors, Such as the solidification conditions, the trace rare -earth metal addition and the intermediate annealing, on the structure and the properties of the Cu - Ag alloy in situ filamentary composite with the lower Ag content were studied. The Cu -Ag alloy in situ filamentary composite with σb 〉 1.5GPa and the electrical conductivity γ〉60% IACS were obtained. The strengthening effect and the two - stage strengthening mechanisms were discussed based on the evolution of microstructure in the deformation process of the Cu - Ag alloy in situ filamentary composites.

关 键 词：金属材料 复合材料 Cu—Ag合金 强化效应 组织细化 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG146.32[金属学及工艺—金属材料]