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Recrystallization kinetics of ultrafine-grained Ni studied by dilatometry |
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| Authors: | Bernd Oberdorfer Eva-Maria Steyskal Wolfgang Sprengel Reinhard Pippan Michael Zehetbauer Werner Puff Roland Würschum |
| Affiliation: | 1. Department of Mechanical Engineering, BITS Pilani, K. K. Birla Goa Campus, Goa, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, India;3. PhotoGAUGE India Private Limited, Chennai, India |
| Abstract: | The release of excess volume upon recrystallization of ultrafine-grained Ni deformed by high-pressure torsion was measured with a high-precision difference-dilatometer employing constant heating rates in the range from 0.3 to 10 K min?1. The kinetics of the recrystallization process was analyzed according to the Johnson–Mehl–Avrami–Kolmogorov theory adapted to the case of constant heating rates. An effective Avrami exponent of 2 and a value of 1.20 eV for the activation energy of recrystallization was determined. Analysis by the Kissinger method yielded the same result for the activation energy. |
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