Mechanical properties,electrical conductivity and microstructure of CuCrZr alloys treated with thermal stretch process  

热拉伸处理CuCrZr合金的力学性能、导电性能和显微组织（英文）

作　　者：张蓓[1] 张治国[1] 李卫[1] 

机构地区：[1]暨南大学材料科学与工程系,广州510632

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第7期2285-2292,共8页中国有色金属学报（英文版）

基　　金：Project(U1034002)supported by the National Natural Science Foundation of China(NSFC)-Guangdong Natural Science Mutual Funds

摘　　要：CuCrZr alloys were treated with the thermal stretch process at various temperatures from 100 to 300℃.The results reveal that the thermal stretch process is successfully developed to manufacture the precipitation hardening CuCrZr alloys with a good combination of microhardness and electrical conductivity.By increasing the tensile elongations at each temperature from 100 to 300℃,the microhardness increases whereas the electrical conductivity decreases slightly.Cr-containing precipitate phases with a Nishiyama-Wasserman orientation relationship to the copper matrix were observed by TEM.The achievement of high micro-hardness and acceptable electrical conductivity in the thermal stretch treated alloys is ascribed to the interactions of the heteroatom solution,dislocation increment,grain refinement and dispersive precipitation effect.采用热拉伸方法在100至300℃温度范围内对CuCrZr合金进行处理,实验结果表明:热拉伸处理工艺能成功地制备具有高硬度和一定导电能力的CuCrZr合金。在不同的处理温度下,随着延伸率的增加,所得材料的显微硬度均有所增加,而导电性均有一定程度的降低。通过TEM观察到大量的含Cr沉淀相,且这些沉淀相与Cu基体之间存在Nishiyama-Wasserman位向关系。热拉伸处理后的CuCrZr合金的高显微硬度和可接受的导电性归因于固溶原子析出、位错增殖、晶粒细化以及沉淀强化的共同作用。

关 键 词：CuCrZr alloys thermal stretch treatment MICROHARDNESS electrical conductivity 

分 类 号：TG146.11[一般工业技术—材料科学与工程]