The formation kinetics of epsilon-Fe3-2N phase in a nanocrystalline alpha-Fe, which was processed by surface mechanical attrition treatment, is found to be obviously increased with respect to that in the coarse-grained form. This can be attributed to the much enhanced heterogeneous nucleation rate at numerous grain boundaries in the nanocrystalline alpha-Fe. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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