Adjaoud, Omar ; Albe, Karsten (2019)
Influence of microstructural features on the plastic deformation behavior of metallic nanoglasses.
In: Acta Materialia, 168
doi: 10.1016/j.actamat.2019.02.033
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We investigate the influence of microstructural properties on the plastic deformation behavior of Cu_64 Zr_36 nanoglasses by means of molecular dynamics simulations. Two different setups are used to prepare nanoglasses. One sample type is a nanoglass obtained by cold-compaction of chemically homogenous and inhomogenous nanoparticles. The second type is generated by assembling pre-shaped polyhedral cuts from the bulk phase. A detailed analysis of both types of microstructures shows that the volume fraction of interfaces in the particle-derived nanoglasses is significantly higher than in the bulk-derived nanoglasses with the same average grain size. The simulations also reveal a clearly distinct plastic response on uniaxial loading: The particle derived samples do not show a stress drop upon yielding, very little strain localization and no strain softening, whereas the bulk-derived samples exhibit a stress drop, strain softening and large strain localization upon loading. These findings are explained in terms of the different glass-glass interfaces present in both structure types. Our results therefore show that the macroscopic deformation behavior of metallic nanoglasses is intimately linked to the structure and topology of the glass-glass interfaces which in turn depend on the processing route.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2019 |
| Autor(en): | Adjaoud, Omar ; Albe, Karsten |
| Art des Eintrags: | Bibliographie |
| Titel: | Influence of microstructural features on the plastic deformation behavior of metallic nanoglasses |
| Sprache: | Englisch |
| Publikationsjahr: | 15 April 2019 |
| Verlag: | Pergamon Elsevier Science Ltd |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Acta Materialia |
| Jahrgang/Volume einer Zeitschrift: | 168 |
| DOI: | 10.1016/j.actamat.2019.02.033 |
| URL / URN: | http://www.sciencedirect.com/science/article/pii/S1359645419... |
| Kurzbeschreibung (Abstract): | We investigate the influence of microstructural properties on the plastic deformation behavior of Cu_64 Zr_36 nanoglasses by means of molecular dynamics simulations. Two different setups are used to prepare nanoglasses. One sample type is a nanoglass obtained by cold-compaction of chemically homogenous and inhomogenous nanoparticles. The second type is generated by assembling pre-shaped polyhedral cuts from the bulk phase. A detailed analysis of both types of microstructures shows that the volume fraction of interfaces in the particle-derived nanoglasses is significantly higher than in the bulk-derived nanoglasses with the same average grain size. The simulations also reveal a clearly distinct plastic response on uniaxial loading: The particle derived samples do not show a stress drop upon yielding, very little strain localization and no strain softening, whereas the bulk-derived samples exhibit a stress drop, strain softening and large strain localization upon loading. These findings are explained in terms of the different glass-glass interfaces present in both structure types. Our results therefore show that the macroscopic deformation behavior of metallic nanoglasses is intimately linked to the structure and topology of the glass-glass interfaces which in turn depend on the processing route. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialmodellierung Zentrale Einrichtungen Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) > Hochleistungsrechner |
| Hinterlegungsdatum: | 15 Apr 2019 07:20 |
| Letzte Änderung: | 25 Sep 2019 05:48 |
| PPN: | |
| Sponsoren: | DFG |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum