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研究了时效处理对Cu-3Ti-3Ni合金组织与性能的影响。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)及透射电子显微镜(TEM)对Cu-3Ti-3Ni合金的组织和析出相进行了表征,并对其硬度、导电率和弹性模量进行了测试。结果表明:Cu-3Ti-3Ni合金时效处理后析出Ni_3Ti及β’-Cu_4Ti相。随着时效时间的延长,部分合金元素回溶于Cu基体,连续的亚稳定β’-Cu_4Ti相向不连续的稳定Cu3Ti相转变。Ni_3Ti相及β’-Cu_4Ti相的析出减少了Ti原子的固溶,导致导电率升高。经过合适的时效处理,Cu-3Ti-3Ni合金中的Ni_3Ti相及连续的亚稳定β’-Cu_4Ti相析出完全,导致硬度升高,但时效处理对合金弹性模量影响不大。在本实验范围内,Cu-3Ti-3Ni合金的最佳时效处理工艺是300℃时效2 h后炉冷,随后450℃时效7 h炉冷。Cu-3Ti-3Ni合金的HV硬度、导电率及弹性模量分别是1.83 GPa、31.34%IACS(国际退火铜标准)及148.62 GPa。
The effect of aging treatment on microstructure and properties of Cu-3Ti-3Ni alloy was studied. The microstructure and precipitates of Cu-3Ti-3Ni alloy were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The hardness, electrical conductivity and elastic modulus The test. The results show that Ni_3Ti and β’-Cu_4Ti phases precipitate after Cu-3Ti-3Ni alloy aging treatment. With the extension of the aging time, some alloying elements are dissolved in the Cu matrix, and the continuous stable metastable β’-Cu_4Ti phase is transformed into discontinuous stable Cu3Ti phase. Precipitation of the Ni_3Ti phase and the β’-Cu_4Ti phase reduces the solid solution of the Ti atoms, resulting in an increase in the electrical conductivity. After appropriate aging treatment, Ni 3 Ti phase and continuous metastable β’-Cu 4 Ti phase in Cu-3Ti-3Ni alloy precipitate completely, resulting in hardness increase, but aging treatment has little effect on the alloy elastic modulus. Within the scope of this experiment, the best aging treatment of Cu-3Ti-3Ni alloy was furnace cooling at 300 ℃ for 2 h and then furnace cooling at 450 ℃ for 7 h. The HV hardness, electrical conductivity and elastic modulus of Cu-3Ti-3Ni alloy are 1.83 GPa, 31.34% IACS (International Annealed Copper Standard) and 148.62 GPa, respectively.