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Solute effects on interfacial dislocation emission in nanomaterials: Nucleation site competition and neutralization

TitleSolute effects on interfacial dislocation emission in nanomaterials: Nucleation site competition and neutralization
Publication TypeJournal Article
Year of Publication2018
AuthorsBorovikov, V, Mendelev, MI, King, AH
JournalScripta Materialia
Volume154
Pagination12-15
Date Published09
Type of ArticleArticle
ISBN Number1359-6462
Accession NumberWOS:000440775000003
Keywords&, copper, cu, design, Dislocation nucleation, grain-boundary segregation, Materials Science, maximum, Metallurgical Engineering, metals, molecular dynamics simulation, molecular-dynamics, Monte Carlo simulation, nanocrystalline alloys, size, Solute segregation at grain boundaries, strength, stress, Technology - Other Topics, yield
Abstract

Solutes added to stabilize nano-crystalline metals against grain growth, may segregate to grain boundaries and triple junctions where they can affect the process of the dislocation emission. We demonstrate that this effect can be very complex due to different rates of segregation at different interfaces. Moreover, at large concentrations, when the solutes form clusters, the interfaces between these clusters and the matrix can introduce new dislocation emission sources, which can be activated under lower applied stress. Thus, the strength maximum can occur at a certain solute concentration: adding solutes beyond this optimal concentration can reduce the strength of the material. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

DOI10.1016/j.scriptamat.2018.05.011
Custom 1

Mesostructures

Alternate JournalScr. Mater.