Two modes of grain boundary pinning by coherent precipitates

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 cont...

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Bibliographic Details
Published in:Acta materialia 2017-08, Vol.135 (C), p.226-232
Main Authors: Wang, Nan, Ji, Yanzhou, Wang, Yongbiao, Wen, Youhai, Chen, Long-Qing
Format: Article
Language:English
Subjects:
Coherent precipitate
elastic misfit strain effect
Grain boundary
grain boundary pinning
Grain growth
MATERIALS SCIENCE
Particle pinning
phase field modeling
Phase-field-crystal model
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Summary: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. [Display omitted]
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2017.06.031