Kalcher, Constanze ; Brink, Tobias ; Rohrer, Jochen ; Stukowski, Alexander ; Albe, Karsten (2017)
Interface-controlled creep in metallic glass composites.
In: Acta Materialia, 141
doi: 10.1016/j.actamat.2017.08.058
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In this work we present molecular dynamics simulations on the creep behavior of Cu_64Zr_36 metallic glass composites. Surprisingly, all composites exhibit much higher creep rates than the homogeneous glass. The glass-crystal interface can be viewed as a weak interphase, where the activation of shear transformation zones is lower than in the surrounding glass. We observe that the creep behavior of the composites does not only depend on the interface area but also on the orientation of the interface with respect to the loading axis. We propose an explanation in terms of different mean Schmid factors of the interfaces, with the amorphous interface regions acting as preferential slip sites.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Kalcher, Constanze ; Brink, Tobias ; Rohrer, Jochen ; Stukowski, Alexander ; Albe, Karsten |
| Art des Eintrags: | Bibliographie |
| Titel: | Interface-controlled creep in metallic glass composites |
| Sprache: | Englisch |
| Publikationsjahr: | 12 September 2017 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Acta Materialia |
| Jahrgang/Volume einer Zeitschrift: | 141 |
| DOI: | 10.1016/j.actamat.2017.08.058 |
| URL / URN: | https://doi.org/10.1016/j.actamat.2017.08.058 |
| Kurzbeschreibung (Abstract): | In this work we present molecular dynamics simulations on the creep behavior of Cu_64Zr_36 metallic glass composites. Surprisingly, all composites exhibit much higher creep rates than the homogeneous glass. The glass-crystal interface can be viewed as a weak interphase, where the activation of shear transformation zones is lower than in the surrounding glass. We observe that the creep behavior of the composites does not only depend on the interface area but also on the orientation of the interface with respect to the loading axis. We propose an explanation in terms of different mean Schmid factors of the interfaces, with the amorphous interface regions acting as preferential slip sites. |
| Freie Schlagworte: | Metallic glass; Glass matrix composites; Creep; Microstructure; Molecular dynamics simulations |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialmodellierung Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) > Hochleistungsrechner 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) 11 Fachbereich Material- und Geowissenschaften Zentrale Einrichtungen |
| Hinterlegungsdatum: | 17 Nov 2017 12:42 |
| Letzte Änderung: | 17 Nov 2017 12:42 |
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