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采用力学性能和电导率测试及透射电镜观察等方法,研究了不同时效工艺对Cu-1.0Cr-0.2Zr合金组织和性能的影响。结果表明:合金在一级时效工艺(960℃固溶2h+60%冷变形+450℃时效4h)下有很强的时效强化效应,抗拉强度和屈服强度分别为527.0MPa和487.0MPa,伸长率为12.3%,导电率为82.0%IACS,软化温度为520℃;采用二级时效工艺(960℃固溶2h+60%冷变形+450℃时效4h+60%冷变形+450℃时效5h),合金保持较高的电导率的同时,合金的强度及软化温度得到较大提高,抗拉强度和屈服强度分别为565.4MPa和524.1MPa,伸长率为9.8%,电导率为80.1%IACS,软化温度为560℃。显微组织分析表明,高强度主要来源于预冷变形引起的亚结构强化和弥散相的析出强化。二级时效工艺细化了析出相的尺寸,析出的弥散质点对基体的回复和再结晶阻碍作用强烈,使合金具有很高的软化温度。
The effects of different aging processes on the microstructure and properties of Cu-1.0Cr-0.2Zr alloy were studied by mechanical properties, electrical conductivity and transmission electron microscopy. The results show that the alloy has a strong aging strengthening effect in the first stage aging process (solution treatment at 960 ℃ for 2h + 60% cold deformation + 450 ℃ for 4h), the tensile strength and yield strength are 527.0MPa and 487.0MPa, respectively The conductivity was 82.3%, the conductivity was 82.0% IACS and the softening temperature was 520 ℃. The second aging process was used (960 ℃ for 2h + 60% cold deformation + 450 ℃ for 4h + 60% cold deformation + 450 ℃ for 5h ), While maintaining high electrical conductivity, the strength and softening temperature of the alloy are greatly improved. The tensile strength and yield strength are 565.4MPa and 524.1MPa respectively, the elongation is 9.8% and the conductivity is 80.1% IACS , The softening temperature is 560 ℃. Microstructure analysis shows that the high strength mainly comes from the sub-structure strengthening caused by the pre-cooling deformation and the precipitation strengthening of the dispersed phase. The second-stage aging process refined the size of the precipitated phase, precipitated dispersion of particles on the substrate and the recrystallization of the strong impediment to the alloy with a high softening temperature.