Schäfer, Jonathan ; Albe, Karsten (2013)
Plasticity of nanocrystalline alloys with chemical order: on the strength and ductility of nanocrystalline Ni–Fe.
In: Beilstein Journal of Nanotechnology, 4
doi: 10.3762/bjnano.4.63
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Plastic deformation and alloying of nanocrystalline Ni–Fe is studied by means of atomic scale computer simulations. By using a combination of Monte-Carlo and molecular dynamics methods we find that solutes have an ordering tendency even if grain sizes are in the nanometer regime, where the phase field of the ordered state is widened as compared to larger grain sizes. Tensile testing of disordered structures with various elemental distributions and the simultaneous analysis of intragranular defects reveal that solid solution strengthening is absent for the studied grain sizes. The composition and relaxation state of the grain boundary control the strength of the material, which is also found for ordered structures (L12), where dislocation activity is suppressed.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Schäfer, Jonathan ; Albe, Karsten |
| Art des Eintrags: | Bibliographie |
| Titel: | Plasticity of nanocrystalline alloys with chemical order: on the strength and ductility of nanocrystalline Ni–Fe |
| Sprache: | Englisch |
| Publikationsjahr: | 19 September 2013 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Beilstein Journal of Nanotechnology |
| Jahrgang/Volume einer Zeitschrift: | 4 |
| DOI: | 10.3762/bjnano.4.63 |
| Kurzbeschreibung (Abstract): | Plastic deformation and alloying of nanocrystalline Ni–Fe is studied by means of atomic scale computer simulations. By using a combination of Monte-Carlo and molecular dynamics methods we find that solutes have an ordering tendency even if grain sizes are in the nanometer regime, where the phase field of the ordered state is widened as compared to larger grain sizes. Tensile testing of disordered structures with various elemental distributions and the simultaneous analysis of intragranular defects reveal that solid solution strengthening is absent for the studied grain sizes. The composition and relaxation state of the grain boundary control the strength of the material, which is also found for ordered structures (L12), where dislocation activity is suppressed. |
| Freie Schlagworte: | nanocrystalline materials, grain boundary structure, grain boundary segregation, plastic deformation, molecular dynamics |
| Zusätzliche Informationen: | This article is part of the Thematic Series "Advances in nanomaterials" and is dedicated to Professor Horst Hahn on the occasion of his 60th birthday. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialmodellierung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 17 Feb 2014 10:32 |
| Letzte Änderung: | 17 Feb 2014 10:32 |
| PPN: | |
| Sponsoren: | Financial support of the Deutsche Forschungsgemeinschaft (FOR714) and grants of computer time from Forschungszentrum Jülich are gratefully acknowledged. |
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