预时效工艺对Cu-Cr-Zr合金力学性能和电学性能的影响

Effect of Pre-aging Treatment on Mechanical and Electrical Properties of Cu-Cr-Zr Alloys

高强高导铜合金经过塑性加工后通常具有高强度,但会严重损失塑性。因此,需要开发新工艺,从而不断提升铜合金的力学性能和电学性能。对固溶态Cu-0.7Cr-0.19Zr合金进行冷轧处理(样品SR),分别采用低温预时效、高温单级时效、低温预时效结合高温时效3种不同的处理工艺制备样品,样品分别命名为SRP, SRA和SRPA。对4种样品的微观组织、强度、塑性和导电率进行了测试。结果表明,时效处理并未造成明显再结晶,保留了超细晶结构及高密度位错。与样品SR相比,单级时效与双级时效均可促成力学与电学性能的综合提升,而双级时效比单级时效更加有效。对样品的强度、塑性和导电率的影响进行了分析。

High-strength and high-conductivity Cu alloys generally possess high strength after plastic deformation,however,with a loss of ductility.Therefore,it is desirable to develop new processes to continuously improve the mechanical and electrical properties.The Cu-0.7Cr-0.19Zr alloy was solution treated and cold rolled into thin sheets(sample SR).The samples were further prepared by three dif⁃ferent processes:low temperature pre-aging(sample SRP),single-stage aging at high temperature(sample SRA),low temperature preag⁃ing combined with high temperature aging(sample SRPA).The microstructure,strength,ductility and electrical conductivity of the four samples were studied.The results showed that the aging treatment did not cause obvious recrystallization,but retained the ultrafinegrained structure and high-density dislocations.Compared with sample SR,both single-stage aging and two-stage aging can improve mechanical and electrical properties,and the two-stage aging route is more effective.Mechanisms for improving the strength,ductility and electrical conductivity were also analyzed.