高强度高导电性铜基合金的显微结构及性能研究

【作者】 刘芙；

【导师】 张孝彬；

【作者基本信息】 浙江大学 ， 材料物理， 2001， 硕士

【摘要】 本文对一种高强度高导电性的Cu-Cr-Zr合金的组织结构和性能进行了研究。采用扫描电镜、透射电镜、X射线衍射、能谱仪等微观分析手段对Cu-Cr-Zr合金的固溶时效状态的微观组织结构进行了系统的观察，对析出相的形貌特征、形成机理做了详细分析，并对合金不同阶段的时效特性进行了探讨，总结了Cu-Cr-Zr合金的时效析出规律。在此基础上研究了不同状态下合金的力学性能、导电性能和磨损性能，讨论了微观组织结构对其各方面性能的影响，从而给出Cu-Cr-Zr合金最佳处理条件。研究结果表明，采用添加低溶质合金元素、固溶强化、时效强化和冷加工强化等多种强化方式将使Cu合金的强度获得很大提高而对其导电性影响较小，是一种同时具有高导电及高强度的良好的铜基导线材料。 此外，本文还对另一种铜基导线材料即Cu-Cr自生复合材料的微观组织结构进行了观察和分析，研究了该合金的机械性能、耐磨性能及导电性能。并对另一种原位反应生成的Cu-纳米TiB₂复合材料的制备方法及显微结构进行了初步探讨。更多还原

【Abstract】 In this thesis, microstructures and properties of a Cu-Cr-Zr alloy with high strength and high electrical conductivity are studied. The specimens of solid solution and after aging of the alloy have been systematically observed and analyzed by means of SEM, TEM, XRD and EDS, the morphological and structural aspects of precipitate and its formation mechanism were also studied in detail. The characters of the alloy at different aging stages are surveyed, and the relationship between precipitation and aging treatments of the Cu-Cr-Zr alloy is then summarized. Moreover, the mechanical property, the electrical conductivity and the wear property of the alloy at different states are also investigated, and the effect of the microstructure on the properties of the alloy is discussed in order to get the optimal treatment condition of Cu-Cr-Zr alloy. It is found that by addition of low-alloying elements, solid solution strengthening, aging strengthening and strain hardening, the strength of Cu alloy increases greatly while its electrical conductivity shows no significant drop. Therefore, it is concluded that above Cu-based Cu-Cr-Zr alloy is a promising conductive material with a high electrical conductivity and high strength as well.Furthermore, the microstructure and property of another Cu-based conductive material, Cu-Cr in-situ composite material, is studied in this thesis. At the same time, preliminary survey of fabrication and microstructure of in-situ Cu-nanoscaleTiB2 composite is also presented in the thesis.更多还原