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Modulating heterogeneity and plasticity in bulk metallic glasses: Role of interfaces on shear banding

Kosiba, K. and Sopu, D. and Scudino, S. and Zhang, L. and Bednarcik, J. and Pauly, S. (2019):
Modulating heterogeneity and plasticity in bulk metallic glasses: Role of interfaces on shear banding.
In: International Journal of Plasticity, 1192019. Elsevier Ltd., pp. 156-170, ISSN 07496419,
DOI: 10.1016/j.ijplas.2019.03.007,
[Online-Edition: https://doi.org/10.1016/j.ijplas.2019.03.007],
[Article]

Abstract

Structural heterogeneities in monolithic metallic glasses, i.e. free volume variations or stress/strain fields, are known to be pivotal for their plasticity but the mechanisms how they affect irreversible deformation remain poorly understood. We show that flash-annealing is a capable tool for modifying the free volume content and its distribution, which creates non-affine stress fields in a monolithic CuZr-based bulk metallic glass. Rather than the overall free volume, μm-scale regions of relaxed and rejuvenated glass govern plastic deformation. Complementary molecular dynamics simulations underpin the importance of the interfaces between relaxed and rejuvenated volumes for shear band proliferation. Not only can we reach unmatched states of metastability in metallic glasses with the present approach but also better understand the mechanisms underlying plasticity in monolithic but structurally heterogeneous metallic glasses.

Item Type: Article
Erschienen: 2019
Creators: Kosiba, K. and Sopu, D. and Scudino, S. and Zhang, L. and Bednarcik, J. and Pauly, S.
Title: Modulating heterogeneity and plasticity in bulk metallic glasses: Role of interfaces on shear banding
Language: English
Abstract:

Structural heterogeneities in monolithic metallic glasses, i.e. free volume variations or stress/strain fields, are known to be pivotal for their plasticity but the mechanisms how they affect irreversible deformation remain poorly understood. We show that flash-annealing is a capable tool for modifying the free volume content and its distribution, which creates non-affine stress fields in a monolithic CuZr-based bulk metallic glass. Rather than the overall free volume, μm-scale regions of relaxed and rejuvenated glass govern plastic deformation. Complementary molecular dynamics simulations underpin the importance of the interfaces between relaxed and rejuvenated volumes for shear band proliferation. Not only can we reach unmatched states of metastability in metallic glasses with the present approach but also better understand the mechanisms underlying plasticity in monolithic but structurally heterogeneous metallic glasses.

Journal or Publication Title: International Journal of Plasticity
Volume: 119
Publisher: Elsevier Ltd.
Uncontrolled Keywords: irreversible deformation, bulk metallic glass, plastic deformation, molecular dynamics
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
Date Deposited: 28 Jan 2020 07:27
DOI: 10.1016/j.ijplas.2019.03.007
Official URL: https://doi.org/10.1016/j.ijplas.2019.03.007
Projects: SO 1518/1-1
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