ABSTRACT Nanocrystalline nickel, having a grain size of about 40 nm, was fabricated by electrolytic deposition and strain-rate jump tests were performed at temperaures between 77 and 473 K to obtain the strain-rate sensitivity and the activation volume . The values of changed from about 0.05 to about 0.005 with increasing stress, indicating that the deformation is governed by the motion of glide dislocations. increased as the temperature increased from 77 to 200 K, but decreased with further increase in temperature. It is concluded that the rate-controlling deformation mechanism in nanocrystalline nickel is temperature sensitive and changes from forest dislocation cutting to dislocation bowing-out and depinning from grain boundaries as the temperature increases.

中文翻译：

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电解沉积纳米晶镍流动应力的温度和应变速率依赖性

摘要 晶粒尺寸约为 40 nm 的纳米晶镍是通过电解沉积制造的，并在 77 和 473 K 之间的温度下进行应变率跳跃测试，以获得应变率灵敏度和活化体积。随着应力的增加， 的值从大约 0.05 变为大约 0.005，表明变形受滑移位错的运动控制。随温度从 77 K 升高到 200 K 而增加，但随着温度进一步升高而降低。结论是纳米晶镍的速率控制变形机制是温度敏感的，随着温度的升高，从森林位错切割到位错弓出和从晶界脱钉。