Title
Effects of Ag and Zr solutes on dislocation emission from Σ11(332)[110] symmetric tilt grain boundaries in Cu: Bigger is not always better
Publication Date
5-23-2018
Department
Ames Laboratory; Materials Science and Engineering
Campus Units
Materials Science and Engineering, Ames Laboratory
OSTI ID+
1481020
Report Number
IS-J 9792
DOI
10.1016/j.ijplas.2018.05.009
Journal Title
International Journal of Plasticity
Volume Number
109
First Page
79
Last Page
87
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.
DOE Contract Number(s)
AC02-07CH11358
Language
en
Department of Energy Subject Categories
36 MATERIALS SCIENCE
Publisher
Iowa State University Digital Repository, Ames IA (United States)
