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A kinetic model for the diffusion-controlled annealing of excess vacancies under the experimentally relevant, non-isothermal condition of time-linear heating is presented and applied to dilatometry. The evolution of the vacancy concentration with time is quantitatively analyzed, considering as ideal sinks either dislocations or grain boundaries of spherical- or cylindrical-shaped crystallites. The validity of the model is tested using dilatometry data that were obtained for ultrafine-grained Ni prepared by high-pressure torsion. The entire two-stage annealing curve of the dilatometric length change can be analyzed by combining the present kinetic model of vacancy annealing at grain boundaries with established non-isothermal kinetics of recrystallization.
|Journal||Journal of Materials Science|
|Publication status||Published - 2018|
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
Fields of Expertise
- Advanced Materials Science
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Defects & Transformations of Materials
Klinser, G., Sprengel, W. & Würschum, R.
1/01/13 → …
Project: Research area
FWF- Defects and structural anisotropy in ultrafine-crystalline metals
Kotzurek, J., Sprengel, W. & Würschum, R.
1/05/13 → 30/04/17
Project: Research project