复杂多组元Cu-Cr-Zr-Ni-Si-Co-Zn合金时效析出动力学研究

Aging Precipitation Kinetics of Complex Multi-Component Cu-Cr-Zr-Ni-Si-Co-Zn Alloy

Cu-Cr-Zr及Cu-Ni-Si合金均为性能优异的引线框架材料,但二者性能均存在局限性。Cu-Cr-Zr合金具有优异的导电性能,但其强度偏低;Cu-Ni-Si合金具有极高的强度,但其导电性能一般。如果结合二者的优点,并通过后续工艺对其组织进行调控,则是制备高强高导铜合金的一条新路径。实验通过真空感应熔炼的方法制备了复杂多组元Cu-0.746Cr-0.217Zr-0.605Ni-0.109Si-0.177Co-0.085Zn(质量分数)合金,对其进行了不同工艺条件的固溶处理,并研究了不同固溶工艺条件下,合金时效过程中电导率及硬度的演化规律。结果表明:合金经1010℃×1.5 h固溶处理后,时效过程在500℃×3 h时,可获得较优异的综合性能,此时合金的硬度为HV 142.83,电导率为60.00%IACS。此外,根据Avrami经验方程描述了合金的时效析出过程,发现不同固溶工艺的合金在时效过程中,析出速率均随时效温度的提高而提高。

Cu-Cr-Zr and Cu-Ni-Si alloys are excellent leadframe materials,but each has its own performance limitations.Cu-Cr-Zr alloy exhibits excellent electrical conductivity but relatively low strength.Cu-Ni-Si alloy exhibits exceptionally high strength but general electrical conductivity.If the advantages of both can be combined and their structures can be regulated through subsequent processes,it exhibits a new path to prepare high-strength and high-conductivity copper alloys.The experiment utilized vacuum induction melting to prepare Cu-0.746Cr-0.217Zr-0.605Ni-0.109Si-0.177Co-0.085Zn(%,mass fraction)alloy.The solution treatment was carried out under different process conditions,and the evolution of electrical conductivity and hardness of the alloy during aging process under different solution treatment conditions was studied.The results showed that after solution treatment at 1010℃for 1.5 h,the aging process at 500℃for 3 h achieved excellent comprehensive performance.In addition,the aging precipitation process of the alloy was described according to the Avrami empirical equation.The results showed that the precipitation rate of the alloys with different solution treatment increases with the increase of aging temperature during the aging process.