期刊
ACTA MATERIALIA
卷 55, 期 13, 页码 4489-4498出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2007.04.013
关键词
classical nucleation theory; heterogeneous nucleation; solid-state phase transformation; steel
The process of grain formation during structural solid-state phase transformations has commonly been analysed in terms of the classical nucleation theory. In polycrystalline materials a new phase generally forms at grain boundaries in the parent phase microstructure. Under certain conditions the net interfacial energy to form a new phase can be relatively small due to the release of grain boundary energy from the parent phase. The nucleation process is then governed by cluster dynamics. We propose a simple model to predict the cross-over between different heterogeneous nucleation regimes and apply it to recent synchrotron X-ray diffraction experiments on ferrite nucleation in steel. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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