Two modes of grain boundary pinning by coherent precipitates
Journal Article
·
· Acta Materialia
- McGill Univ., Montreal, QC (Canada). Physics Dept.; Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering
- National Energy Technology Lab. (NETL), Albany, OR (United States)
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.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house research
- Sponsoring Organization:
- National Science and Engineering Research Council of Canada.; USDOE Office of Fossil Energy (FE)
- OSTI ID:
- 1374188
- Alternate ID(s):
- OSTI ID: 22695932
- Report Number(s):
- NETL-PUB--20948
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 135; ISSN 1359-6454
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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