铜基合金沉淀硬化研究  

Precipitation Hardening of Cu-based Alloy

作　　者：徐洪辉[1] 杜勇[1] 张云河[2] 徐徽[2] 金展鹏[1] 森永正彦[3] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]中南大学冶金科学与工程学院,湖南长沙410083 [3]名古屋大学工学研究科

出　　处：《金属热处理》2003年第11期25-28,共4页Heat Treatment of Metals

摘　　要：采用感应熔炼制备了铜基合金Cu 2 0Mg 1 5Ag(质量百分数 ,下同 ) ,并通过滚压和热处理进一步使合金的成分均一化。样品分别在 4 5 0℃和 5 0 0℃下进行不同时间的时效处理 ,然后测定其维氏硬度随时效时间的变化规律。扫描电镜显微分析揭示了合金显微组织结构的演变 ,且表明 ,时效处理后第二相Cu2 Mg沉淀颗粒非常细小 ,并很好地分散于铜基体中。沉淀硬化实现了铜基合金的高效强化 ,最佳的时效条件为 4 5 0℃× 96h。Cu-based alloy Cu-2.0wt%Mg-1.5wt%Ag was prepared by inductive melting,and its homogeneity was further improved through a combination of rolling and heat treatment.The samples were aged at 450℃ and 500℃ for different time respectively to determine the variation of Vickers hardness with aging time.SEM analysis revealed the evolution of the alloys' microstructures,and demonstrated that the second phase Cu_2Mg is precipitated and well dispersed in the Cu matrix,and its particle size is very tiny.So,the highly efficient strengthening of the Cu-based alloy is attained by precipitation hardening.The optimun aging condition is about 450℃×96h.

关 键 词：铜基合金 沉淀硬化 时效处理 显微组织 高强度 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—金属材料]