Recrystallization kinetics of ultrafine-grained Ni studied by dilatometry

Autor(en)

Bernd Oberdorfer, Eva-Maria Steyskal, Wolfgang Sprengel, Reinhard Pippan, Michael Zehetbauer, Werner Puff, Roland Würschum

Abstrakt

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.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Technische Universität Graz, Österreichische Akademie der Wissenschaften (ÖAW)

Seiten

309-311

Anzahl der Seiten

3

DOI

https://doi.org/10.1016/j.jallcom.2010.12.130

Publikationsdatum

2011

ÖFOS 2012

210006 Nanotechnologie, 103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/c52614b2-4a25-4564-96de-b6c5c80902da