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。
基金
Project(U1034002)supported by the National Natural Science Foundation of China(NSFC)-Guangdong Natural Science Mutual Funds
