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Interface-controlled creep in metallic glass composites

Kalcher, Constanze and Brink, Tobias and Rohrer, Jochen and Stukowski, Alexander and Albe, Karsten (2017):
Interface-controlled creep in metallic glass composites.
In: Acta Materialia, pp. 251-260, 141, ISSN 13596454, DOI: 10.1016/j.actamat.2017.08.058, [Online-Edition: https://doi.org/10.1016/j.actamat.2017.08.058],
[Article]

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.

Item Type: Article
Erschienen: 2017
Creators: Kalcher, Constanze and Brink, Tobias and Rohrer, Jochen and Stukowski, Alexander and Albe, Karsten
Title: Interface-controlled creep in metallic glass composites
Language: English
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.

Journal or Publication Title: Acta Materialia
Volume: 141
Uncontrolled Keywords: Metallic glass; Glass matrix composites; Creep; Microstructure; Molecular dynamics simulations
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) > Hochleistungsrechner
11 Department of Materials and Earth Sciences > Material Science
Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ)
11 Department of Materials and Earth Sciences
Zentrale Einrichtungen
Date Deposited: 17 Nov 2017 12:42
DOI: 10.1016/j.actamat.2017.08.058
Official URL: https://doi.org/10.1016/j.actamat.2017.08.058
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