Abstract
The effect of severe plastic deformation on the evolution of the microstructure and the grain-boundary ensemble in ultrafine-grained (UFG) nickel is studied. Torsion under quasi-hydrostatic pressure can produce a uniform UFG structure such that both the microstructure and grain-boundary ensemble are statistically uniform over the whole volume of a sample. The experimental results on relaxation processes in the UFG nickel produced by both severe plastic deformation and electrodeposition are presented. The grain-growth kinetics in the UFG nickel produced by equal-channel angular pressing is studied. The grain-growth activation energy is found to coincide with the activation energy of grain-boundary self-diffusion. The experimental results on the evolution of the grain-boundary spectrum upon annealing of the UFG nickel produced by torsion are described. The activation energy and stored enthalpy for the UFG nickel are measured by differential scanning photometry. Copyright © 2004 by MAIK "Nauka/Interperiodica".
| Original language | English |
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| Pages (from-to) | 60-74 |
| Journal | Russian Metallurgy (Metally) |
| Volume | 2004 |
| Issue number | 1 |
| Publication status | Published - 1 Jan 2004 |