Abstract
Stress relaxation of nanocrystalline nickel within the range of temperatures from 523 to 673K (0.17–0.27·T m) in the regime of uniaxial compression is studied. The results obtained for nickel with more coarse grains are given for comparison. An average strain rate of nanocrystalline nickel within the investigated range of temperatures is 1.75·10 −5–3.03· 10 −5s −1. The presence of two types of stress relaxation dependencies is shown. The most probable mechanism of plastic strain is grain boundary sliding controlled by grain boundary diffusion for 623–673K. At lower test temperatures, 523–573K, a plastic strain occurs by the powder law creep according to the Weertman model.
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