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Influence of microstructural features on the plastic deformation behavior of metallic nanoglasses

Adjaoud, Omar and Albe, Karsten (2019):
Influence of microstructural features on the plastic deformation behavior of metallic nanoglasses.
In: Acta Materialia, Pergamon Elsevier Science Ltd, pp. 393-400, 168, ISSN 13596454,
DOI: 10.1016/j.actamat.2019.02.033,
[Online-Edition: http://www.sciencedirect.com/science/article/pii/S1359645419...],
[Article]

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.

Item Type: Article
Erschienen: 2019
Creators: Adjaoud, Omar and Albe, Karsten
Title: Influence of microstructural features on the plastic deformation behavior of metallic nanoglasses
Language: English
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.

Journal or Publication Title: Acta Materialia
Volume: 168
Publisher: Pergamon Elsevier Science Ltd
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
Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ)
Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) > Hochleistungsrechner
Date Deposited: 15 Apr 2019 07:20
DOI: 10.1016/j.actamat.2019.02.033
Official URL: http://www.sciencedirect.com/science/article/pii/S1359645419...
Funders: DFG
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