有无稀土CuCrSnZn合金形变时效组织和性能

Deformation and aging microstructure and properties of CuCrSnZn alloy with or without rare earth

为了研发新型高强高导引线框架CuCrSnZn系合金,研究了不同的形变热处理工艺以及稀土元素Ce、Y对Cu-Cr-Sn-Zn合金的显微硬度和导电率的影响。通过金相显微镜对合金的微观组织进行了研究。结果表明:经过920℃下1 h固溶450℃下时效3 h后,3种合金达到最好的综合性能。时效前冷变形能够明显提高合金的硬度,导电率基本保持不变。变形量小于60%时,随着变形量的增加,时效后的晶粒越细小;变形量为80%时,出现了粗大的晶粒。Cu-Cr-Sn-Zn-Y合金经过60%冷变形450℃时效1 h后,其硬度和导电率能够达到172.1HV、70%IACS。

For the purpose of researching and developing new types of lead frame CuCrSnZn alloys with high e-lectrical conductivity and high strength, the impact of thermomechanical treatment and trace rare earth Ce and Y on the microhardness and electrical conductivity of the Cu-Cr-Sn-Zn alloy was studied.The microstructure of the alloy was researched through the use of a metallographic microscope .The results show that these three types of alloys have the best comprehensive performance after the solution is at 920℃ for 1 h and aged at 450℃ for 3 h.Cold deformation before aging can obviously increase the hardness of the alloy, and the electrical conduc-tivity almost does not change.The grain is finer with the increase of deformation when the deformation is less than 60%.But the grain will increase in coarseness when the deformation is 80%.The hardness and the elec-trical conductivity of the Cu-Cr-Sn-Zn-Y alloy can reach 172.1 HV and 70%IACS respectively after 60%cold deformation and aged at 450℃ for 1 h.