4.7 Article

Two modes of grain boundary pinning by coherent precipitates

Journal

ACTA MATERIALIA
Volume 135, Issue -, Pages 226-232

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.06.031

Keywords

Grain growth; Grain boundary; Coherent precipitate; Particle pinning; Phase-field-crystal model

Funding

  1. National Science and Engineering Research Council of Canada

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We propose a two-mechanism theory to estimate the pinning effect of coherent precipitates on grain boundary (GB) migration in grain growth, taking into account the important effect of elastic misfit strain at the coherent interface. Depending on the relative importance of the elastic and the GB contributions to the total free energy, Zener type stabilization or a novel elastic energy induced stabilization may occur. It is found that the pinning is most effective in the crossover region between these two mechanisms. A phase-field-crystal model is used to numerically validate the theory. Relevant experiments and potential impacts on alloy design are also discussed. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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