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采用真空感应熔炼技术浇铸CuNiCoBe合金,利用光学显微镜、硬度计、电导仪,研究固溶、冷变形和时效处理工艺对CuNiCoBe合金组织和性能的影响。结果表明,CuNiCoBe合金较为合适的固溶温度为960℃;时效前冷变形有利于加快时效进程、缩短时效时间;冷变形量越大,合金时效后的室温硬度越高,达到时效硬化峰值的时间越短,峰值后硬度下降的幅度越大;总体说来冷,预冷变形亦有利于提高合金时效后的电导率,提高幅度平均约为10%。经960℃保温1.5 h固溶处理+60%冷变形+490℃保温2.5 h时效处理后的CuNiCoBe合金的硬度可达377 HV30,比未冷变形时提高了124%。
CuNiCoBe alloy was cast by vacuum induction melting technique. The effects of solution treatment, cold deformation and aging treatment on microstructure and properties of CuNiCoBe alloy were studied by optical microscope, hardness tester and conductivity meter. The results show that the suitable solution temperature of CuNiCoBe alloy is 960 ℃. The cold deformation before aging can accelerate the aging process and shorten the aging time. The larger the cold deformation, the higher the room temperature hardness after aging, The shorter the peak, the greater the decrease of hardness. In general, the cold and pre-cooling deformations are also conducive to increasing the conductivity of the alloy after aging, an average increase of about 10%. The hardness of CuNiCoBe alloy aged at 960 ℃ for 1.5 h after solution treatment + 60% cold deformation + 490 ℃ for 2.5 h aging treatment was up to 377 HV30, which was 124% higher than that without cold deformation.