合金化元素对Cu-Cr-Zr合金性能的影响  

Effects of Alloying Elements on Mechanical and Electrical Properties of Cu-Cr-Zr Alloy

作　　者：解浩峰[1] 米绪军[1] 黄国杰[1] 尹向前[1] 李艳锋[1] 高宝东[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《稀有金属》2011年第3期458-462,共5页Chinese Journal of Rare Metals

基　　金：国家863计划资助项目(2006AA03Z522);国家自然科学基金资助项目(50704006);中国铝业公司科技发展基金资助项目

摘　　要：探讨了Ag,Sn,Mg,S i,RE几种合金化元素对Cu-0.3%C r-0.1%Zr合金力学性能和导电性能的影响。所有合金试样经940℃固溶处理1 h后淬火,冷拉拔至加工变形量为20%,分别在350,400,450,500和550℃时效处理3.5 h。测试结果表明,在400℃时效3.5 h时,含Ag合金的抗拉强度和电导率最高,分别高于其他合金10~70 MPa和1.5%~5.0%IACS。合金化元素提高合金强度的能力由大到小依次为Ag,Sn,Mg,RE,S i;而在提高电导率方面由强到弱则依次为Ag,RE,Mg,Sn,S。i含S i合金具有较低的伸长率,约为6.6%,而其他几种合金的伸长率相差不大,均在12%左右。采用TEM观察了Cu-0.3%C r-0.1%Zr-0.1%Ag合金在400℃时效3.5 h的组织,发现两种析出相,选区电子衍射标定结果表明它们分别是C r和Cu4Zr。合金性能主要由析出相的尺寸、分布和数量决定,而不同合金化元素对Cu-C r-Zr合金的强化机制以及时效后在基体中的存在状态是造成性能差异的主要原因。Effects of various alloying elements,including Ag,Sn,Mg,Si,and RE on mechanical and electrical properties of Cu-0.3%Cr-0.1%Zr alloy were discussed.All studied alloys were solution-treated at 940 ℃ for 1 h and quenched.The quenched samples were cold-drawn to a deformation of 20%,and then aged at 350,400,450,500 and 550 ℃ respectively for 3.5 h.The testing results showed that when the alloys aged at 400 ℃ for 3.5 h,both tensile strength and electric conductivity of the alloy with Ag addition were the highest of all,and the differences were 10~70 MPa and 1.5% ~5.0% IACS,respectively.The capacity of alloying elements to improve the strength in descending order was Ag,Sn,Mg,RE and Si,and to improve the conductivity from strong to weak was followed by Ag,RE,Mg,Sn and Si.The testing results also showed that most of the alloys had an approximate elongation of 12%,besides the alloy with Si addition,which showed an elongation of 6.6%.Structure of Cu-0.3%Cr-0.1%Zr-0.1%Ag alloy aged at 400 ℃ for 3.5 h was observed using the transmission electron microscope（TEM）.The BF image and SAED pattern revealed two kinds of precipitates of Cr and Cu4Zr.So the properties of Cu-Cr-Zr alloys were determined by their size,number and distribution.The differences on properties were depended on strengthening mechanisms and the form in the copper matrix of various alloying elements for Cu-Cr-Zr alloy after aging.

关 键 词：CU-CR-ZR合金 合金化元素 抗拉强度 伸长率 电导率 

分 类 号：TG146.1[一般工业技术—材料科学与工程]