Cu-Cr-Zr合金在施加直流电流时效后的电性能和力学性能(英文)

• 作 者: 王志强 钟云波 饶显君 汪超 王江 张增光 任维丽 任忠鸣
• 机 构: 上海大学材料工程系,
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2012年05期
• 关键词: 时效 合金 Cu-Cr-Zr合金 导电性 直流电流 硬度 力学性能 电流时效 析出 电导率

在不同温度和电流密度下对Cu-Cr-Zr合金进行不同时间的时效处理,发现在合适的时效温度下施加电流,可以同时提高合金时效后的电导率和硬度。随着电流密度的增加,电导率呈线性增长,但硬度保持不变。显微组织观察表明,施加电流时效后,组织中出现了大量的位错和纳米级铬析出物,这是提高电导率和硬度的原因。电流作用机理与焦耳热、大量电子的迁移及因电子风力而提高的溶质原子、空位和位错的扩散能力有关。

At different temperatures and current densities, the Cu-Cr-Zr alloys were aged at different times and found that applying current at the appropriate aging temperature could improve the conductivity and hardness of the alloy after aging. As the current density increases, the conductivity increases linearly but the hardness remains constant. Microstructure observations showed that a large number of dislocations and nanoscale chromium precipitates were present in the microstructure after the aging of the applied current, which is responsible for the increase of electrical conductivity and hardness. The mechanism of current action is related to the Joule heat, the migration of a large number of electrons and the diffusion ability of solute atoms, vacancies and dislocations due to the electron wind force.