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Origin of large plasticity and multiscale effects in iron-based metallic glasses
The large plasticity observed in newly developed monolithic bulk metallic glasses under quasi-static compression raises a question about the contribution of atomic scale effects. Here, nanocrystals on the order of 1–1.5 nm in size are observed within an Fe-based bulk metallic glass using aberration-...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5889395/ https://www.ncbi.nlm.nih.gov/pubmed/29626189 http://dx.doi.org/10.1038/s41467-018-03744-5 |
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author | Sarac, Baran Ivanov, Yurii P. Chuvilin, Andrey Schöberl, Thomas Stoica, Mihai Zhang, Zaoli Eckert, Jürgen |
author_facet | Sarac, Baran Ivanov, Yurii P. Chuvilin, Andrey Schöberl, Thomas Stoica, Mihai Zhang, Zaoli Eckert, Jürgen |
author_sort | Sarac, Baran |
collection | PubMed |
description | The large plasticity observed in newly developed monolithic bulk metallic glasses under quasi-static compression raises a question about the contribution of atomic scale effects. Here, nanocrystals on the order of 1–1.5 nm in size are observed within an Fe-based bulk metallic glass using aberration-corrected high-resolution transmission electron microscopy (HRTEM). The accumulation of nanocrystals is linked to the presence of hard and soft zones, which is connected to the micro-scale hardness and elastic modulus confirmed by nanoindentation. Furthermore, we performed systematic simulations of HRTEM images at varying sample thicknesses, and established a theoretical model for the estimation of the shear transformation zone size. The findings suggest that the main mechanism behind the formation of softer regions are the homogenously dispersed nanocrystals, which are responsible for the start and stop mechanism of shear transformation zones and hence, play a key role in the enhancement of mechanical properties. |
format | Online Article Text |
id | pubmed-5889395 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-58893952018-04-09 Origin of large plasticity and multiscale effects in iron-based metallic glasses Sarac, Baran Ivanov, Yurii P. Chuvilin, Andrey Schöberl, Thomas Stoica, Mihai Zhang, Zaoli Eckert, Jürgen Nat Commun Article The large plasticity observed in newly developed monolithic bulk metallic glasses under quasi-static compression raises a question about the contribution of atomic scale effects. Here, nanocrystals on the order of 1–1.5 nm in size are observed within an Fe-based bulk metallic glass using aberration-corrected high-resolution transmission electron microscopy (HRTEM). The accumulation of nanocrystals is linked to the presence of hard and soft zones, which is connected to the micro-scale hardness and elastic modulus confirmed by nanoindentation. Furthermore, we performed systematic simulations of HRTEM images at varying sample thicknesses, and established a theoretical model for the estimation of the shear transformation zone size. The findings suggest that the main mechanism behind the formation of softer regions are the homogenously dispersed nanocrystals, which are responsible for the start and stop mechanism of shear transformation zones and hence, play a key role in the enhancement of mechanical properties. Nature Publishing Group UK 2018-04-06 /pmc/articles/PMC5889395/ /pubmed/29626189 http://dx.doi.org/10.1038/s41467-018-03744-5 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Sarac, Baran Ivanov, Yurii P. Chuvilin, Andrey Schöberl, Thomas Stoica, Mihai Zhang, Zaoli Eckert, Jürgen Origin of large plasticity and multiscale effects in iron-based metallic glasses |
title | Origin of large plasticity and multiscale effects in iron-based metallic glasses |
title_full | Origin of large plasticity and multiscale effects in iron-based metallic glasses |
title_fullStr | Origin of large plasticity and multiscale effects in iron-based metallic glasses |
title_full_unstemmed | Origin of large plasticity and multiscale effects in iron-based metallic glasses |
title_short | Origin of large plasticity and multiscale effects in iron-based metallic glasses |
title_sort | origin of large plasticity and multiscale effects in iron-based metallic glasses |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5889395/ https://www.ncbi.nlm.nih.gov/pubmed/29626189 http://dx.doi.org/10.1038/s41467-018-03744-5 |
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