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Title: Two modes of grain boundary pinning by coherent precipitates

Abstract

Here, 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. Finally, a phase-field-crystal model is used to numerically validate the theory. Relevant experiments and potential impacts on alloy design are also discussed.

Authors:
 [1];  [2];  [2];  [3];  [2]
  1. McGill Univ., Montreal, QC (Canada). Physics Dept.; Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering
  2. Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering
  3. National Energy Technology Lab. (NETL), Albany, OR (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org.:
USDOE Office of Fossil Energy (FE); National Science and Engineering Research Council of Canada.
OSTI Identifier:
1374188
Report Number(s):
NETL-PUB-20948
Journal ID: ISSN 1359-6454
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 135; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; grain boundary pinning; coherent precipitate; phase field modeling; elastic misfit strain effect

Citation Formats

Wang, Nan, Ji, Yanzhou, Wang, Yongbiao, Wen, Youhai, and Chen, Long-Qing. Two modes of grain boundary pinning by coherent precipitates. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.06.031.
Wang, Nan, Ji, Yanzhou, Wang, Yongbiao, Wen, Youhai, & Chen, Long-Qing. Two modes of grain boundary pinning by coherent precipitates. United States. https://doi.org/10.1016/j.actamat.2017.06.031
Wang, Nan, Ji, Yanzhou, Wang, Yongbiao, Wen, Youhai, and Chen, Long-Qing. Sun . "Two modes of grain boundary pinning by coherent precipitates". United States. https://doi.org/10.1016/j.actamat.2017.06.031. https://www.osti.gov/servlets/purl/1374188.
@article{osti_1374188,
title = {Two modes of grain boundary pinning by coherent precipitates},
author = {Wang, Nan and Ji, Yanzhou and Wang, Yongbiao and Wen, Youhai and Chen, Long-Qing},
abstractNote = {Here, 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. Finally, a phase-field-crystal model is used to numerically validate the theory. Relevant experiments and potential impacts on alloy design are also discussed.},
doi = {10.1016/j.actamat.2017.06.031},
journal = {Acta Materialia},
number = C,
volume = 135,
place = {United States},
year = {Sun Jun 18 00:00:00 EDT 2017},
month = {Sun Jun 18 00:00:00 EDT 2017}
}

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