Campus Units

Materials Science and Engineering, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

10-2018

Journal or Book Title

International Journal of Plasticity

Volume

109

First Page

79

Last Page

87

DOI

10.1016/j.ijplas.2018.05.009

Abstract

Solute additions are commonly used to stabilize nanocrystalline materials against grain growth, and can simultaneously enhance the strength of the material by impeding dislocation emission from the grain boundaries. In this study we demonstrate using molecular dynamics (MD) simulations that the effect of solutes on dislocation nucleation depends on the distribution of solutes at the grain boundary, and can vary dramatically depending on the solute type. Solutes with a smaller positive size mismatch to the host can be more effective in suppressing dislocation emission from grain boundaries than others that have larger mismatch. In particular, although Ag solutes have a smaller misfit with Cu than Zr solutes, the effect of Ag on the dislocation nucleation from grain boundaries in Cu can be larger than the corresponding effect of Zr. These findings are relevant to the search for optimal solute additions, which can strengthen a nanocrytalline material by suppressing the nucleation of dislocation slip from grain boundaries, while stabilizing it against grain growth.

Comments

This is a manuscript of the article Borovikov, Valery, Mikhail I. Mendelev, and Alexander H. King. "Effects of Ag and Zr solutes on dislocation emission from Σ11 (332)[110] symmetric tilt grain boundaries in Cu: Bigger is not always better." International Journal of Plasticity 109 (2018): 79-87. DOI: 10.1016/j.ijplas.2018.05.009. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Copyright Owner

Elsevier Ltd.

Language

en

File Format

application/pdf

Available for download on Saturday, May 23, 2020

Published Version

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