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Influence of Crystalline Nanoprecipitates on Shear-Band Propagation in Cu-Zr-Based Metallic Glasses

Brink, Tobias and Peterlechner, Martin and Rösner, Harald and Albe, Karsten and Wilde, Gerhard (2016):
Influence of Crystalline Nanoprecipitates on Shear-Band Propagation in Cu-Zr-Based Metallic Glasses.
In: Physical Review Applied, pp. 054005-(1, 5, (5), ISSN 2331-7019,
[Online-Edition: http://dx.doi.org/10.1103/PhysRevApplied.5.054005],
[Article]

Abstract

The interaction of shear bands with crystalline nanoprecipitates in Cu-Zr-based metallic glasses is investigated by a combination of high-resolution TEM imaging and molecular-dynamics computer simulations. Our results reveal different interaction mechanisms: Shear bands can dissolve precipitates, can wrap around crystalline obstacles, or can be blocked depending on the size and density of the precipitates. If the crystalline phase has a low yield strength, we also observe slip transfer through the precipitate. Based on the computational results and experimental findings, a qualitative mechanism map is proposed that categorizes the various processes as a function of the critical stress for dislocation nucleation, precipitate size, and distance.

Item Type: Article
Erschienen: 2016
Creators: Brink, Tobias and Peterlechner, Martin and Rösner, Harald and Albe, Karsten and Wilde, Gerhard
Title: Influence of Crystalline Nanoprecipitates on Shear-Band Propagation in Cu-Zr-Based Metallic Glasses
Language: English
Abstract:

The interaction of shear bands with crystalline nanoprecipitates in Cu-Zr-based metallic glasses is investigated by a combination of high-resolution TEM imaging and molecular-dynamics computer simulations. Our results reveal different interaction mechanisms: Shear bands can dissolve precipitates, can wrap around crystalline obstacles, or can be blocked depending on the size and density of the precipitates. If the crystalline phase has a low yield strength, we also observe slip transfer through the precipitate. Based on the computational results and experimental findings, a qualitative mechanism map is proposed that categorizes the various processes as a function of the critical stress for dislocation nucleation, precipitate size, and distance.

Journal or Publication Title: Physical Review Applied
Volume: 5
Number: 5
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) > Hochleistungsrechner
Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ)
Zentrale Einrichtungen
Date Deposited: 13 May 2016 11:20
Official URL: http://dx.doi.org/10.1103/PhysRevApplied.5.054005
Identification Number: doi:10.1103/PhysRevApplied.5.054005
Funders: Financial support by the Deutsche Forschungsgemeinschaft (DFG) through project Grants No. AL 578/13-1, No. AL 578/6-2, and No. WI 1899/12-1 is gratefully acknowledged.
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