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采用拉伸力学性能测试、电导率测定和透射电镜分析等试验方法,研究双级时效处理对Cu-Cr-Zr合金微观组织与性能的影响。结果表明:Cu-Cr-Zr合金较为理想的双级时效工艺为350℃,15min+470℃,60min,在此工艺条件下,合金的抗拉强度和屈服强度分别达到535.0和510.0MPa,电导率为87.0%IACS。对于先低温后高温的双级时效制度,合金在350℃低温时效时溶质原子在空位、位错等缺陷处富集形成GP区,为高温时效析出相提供形核核心,在470℃高温时效后基体中析出大量弥散分布的细小颗粒状强化相,在提高了合金强度的同时,电导率也获得大幅度的升高。
The effects of two-stage aging treatment on the microstructure and properties of Cu-Cr-Zr alloy were investigated by means of tensile mechanical testing, conductivity measurement and transmission electron microscopy. The results show that the ideal two-stage aging process of Cu-Cr-Zr alloy is 350 ℃, 15min + 470 ℃, 60min. Under this condition, the tensile strength and yield strength of the alloy reach 535.0 and 510.0MPa, respectively. 87.0% IACS. For the dual-stage aging at low temperature and high temperature, the solute atoms are enriched in defects such as vacancies and dislocations at 350 ℃, forming a GP zone for the high-temperature aging precipitates. After aging at 470 ℃ for a long time, The matrix precipitates a large number of fine particles of dispersed dispersed phase strengthening, while increasing the alloy strength, conductivity has also been significantly increased.