On the classification of phase transformations

The various classification schemes, based on thermodynamics, microstructure or mechanism, are discussed and criticized from a practical as well as a more fundamental point of view. For example, it is generally not meaningful to consider first and second-order transformations as equivalent with heterogeneous and homogeneous transformations, respectively. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.