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设计了一种新型导电结构材料Cu-Zn-Cr合金。通过金相观察、硬度测量、电导率测量和透射电子显微分析(TEM)以及高分辨分析的方法,研究了形变热处理工艺对Cu-Zn-Cr合金性能的影响以及Cu-Zn-Cr合金的强化机理。结果表明,由均匀化、热轧、固溶、冷轧、时效组成的形变热处理工艺能显著提高合金性能;合金的最佳均匀化温度为900℃,最佳时效温度为400℃,最佳时效时间为1 h;960℃固溶处理2 h能提高时效强化效果。经过固溶处理后冷变形80%,再在400℃时效1 h后合金综合性能最佳,硬度为194 HV2,电导率为42%IACS。时效过程中Cr以纳米级的第二相粒子形式从过饱和固溶体中析出,产生沉淀强化效果,同时净化了基体,提高了电导率。
A new conductive structure material Cu-Zn-Cr alloy was designed. The effect of deformation heat treatment on the properties of Cu-Zn-Cr alloy and the effect of Cu-Zn-Cr alloy on the properties of Cu-Zn-Cr alloy were studied by metallographic observation, hardness measurement, conductivity measurement, transmission electron microscopy (TEM) and high resolution analysis Strengthen the mechanism. The results show that the alloy prepared by the heat treatment of homogenization, hot rolling, solution treatment, cold rolling and aging can significantly improve the properties of the alloy. The optimum homogenization temperature is 900 ℃ and the optimum aging temperature is 400 ℃. Time is 1 h; solution treatment at 960 ℃ for 2 h can enhance the effect of aging strengthening. After solution treatment, the alloy is cold deformed by 80%, and then the alloy has the best comprehensive performance after aging at 400 ℃ for 1 h. The hardness is 194 HV2 and the conductivity is 42% IACS. During the aging process, Cr is precipitated from the supersaturated solid solution in the form of nano-sized second phase particles, resulting in a precipitation strengthening effect, while the substrate is purified and the conductivity is increased.