Schäfer, Jonathan ; Albe, Karsten (2012)
Competing deformation mechanisms in nanocrystalline metals and alloys: Coupled motion versus grain boundary sliding.
In: Acta Materialia, 60 (17)
doi: 10.1016/j.actamat.2012.07.044
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Plastic deformation of nanocrystalline Pd and Cu as well as the demixing systems Cu–Nb and Cu–Fe is studied by means of atomic-scale computer simulations. The microstructures are specifically chosen to facilitate mesoscopic grain boundary sliding. The influence of segregating solutes on the deformation mechanisms is studied and different cases of solute distributions are compared. We find that the competition between mesoscopic grain boundary sliding and coupled grain boundary motion is controlled by the concentration and distribution of segregating solutes. By analyzing the microstructural evolution and dislocation activity we make a connection between the atomistic solute distribution and the mechanisms of deformation, explaining the observed stress–strain behavior. The detailed analysis of the normal grain boundary motion reveals a stick–slip behavior and a coupling factor which is consistent with results from bicrystal simulations.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Schäfer, Jonathan ; Albe, Karsten |
| Art des Eintrags: | Bibliographie |
| Titel: | Competing deformation mechanisms in nanocrystalline metals and alloys: Coupled motion versus grain boundary sliding |
| Sprache: | Englisch |
| Publikationsjahr: | Oktober 2012 |
| Verlag: | Elsevier Science Publishing Company |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Acta Materialia |
| Jahrgang/Volume einer Zeitschrift: | 60 |
| (Heft-)Nummer: | 17 |
| DOI: | 10.1016/j.actamat.2012.07.044 |
| Kurzbeschreibung (Abstract): | Plastic deformation of nanocrystalline Pd and Cu as well as the demixing systems Cu–Nb and Cu–Fe is studied by means of atomic-scale computer simulations. The microstructures are specifically chosen to facilitate mesoscopic grain boundary sliding. The influence of segregating solutes on the deformation mechanisms is studied and different cases of solute distributions are compared. We find that the competition between mesoscopic grain boundary sliding and coupled grain boundary motion is controlled by the concentration and distribution of segregating solutes. By analyzing the microstructural evolution and dislocation activity we make a connection between the atomistic solute distribution and the mechanisms of deformation, explaining the observed stress–strain behavior. The detailed analysis of the normal grain boundary motion reveals a stick–slip behavior and a coupling factor which is consistent with results from bicrystal simulations. |
| Freie Schlagworte: | Nanocrystalline materials, Grain boundary segregation, Plastic deformation, Molecular dynamics |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialmodellierung |
| Hinterlegungsdatum: | 31 Aug 2012 09:55 |
| Letzte Änderung: | 12 Jan 2024 09:16 |
| PPN: | |
| Sponsoren: | The authors acknowledge the financial support of the Deutsche Forschungsgemeinschaft (FOR714) and the grants of computer time from Forschungszentrum Jülich. |
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