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Local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation

At room temperature, plastic flow of metallic glasses (MGs) is sharply localized in shear bands, which are a key feature of the plastic deformation in MGs. Despite their clear importance and decades of study, the conditions for formation of shear bands, their structural evolution and multiplication...

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Autores principales: He, Jie, Kaban, Ivan, Mattern, Norbert, Song, Kaikai, Sun, Baoan, Zhao, Jiuzhou, Kim, Do Hyang, Eckert, Jürgen, Greer, A. Lindsay
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4867588/
https://www.ncbi.nlm.nih.gov/pubmed/27181922
http://dx.doi.org/10.1038/srep25832
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author He, Jie
Kaban, Ivan
Mattern, Norbert
Song, Kaikai
Sun, Baoan
Zhao, Jiuzhou
Kim, Do Hyang
Eckert, Jürgen
Greer, A. Lindsay
author_facet He, Jie
Kaban, Ivan
Mattern, Norbert
Song, Kaikai
Sun, Baoan
Zhao, Jiuzhou
Kim, Do Hyang
Eckert, Jürgen
Greer, A. Lindsay
author_sort He, Jie
collection PubMed
description At room temperature, plastic flow of metallic glasses (MGs) is sharply localized in shear bands, which are a key feature of the plastic deformation in MGs. Despite their clear importance and decades of study, the conditions for formation of shear bands, their structural evolution and multiplication mechanism are still under debate. In this work, we investigate the local conditions at shear bands in new phase-separated bulk MGs containing glassy nanospheres and exhibiting exceptional plasticity under compression. It is found that the glassy nanospheres within the shear band dissolve through mechanical mixing driven by the sharp strain localization there, while those nearby in the matrix coarsen by Ostwald ripening due to the increased atomic mobility. The experimental evidence demonstrates that there exists an affected zone around the shear band. This zone may arise from low-strain plastic deformation in the matrix between the bands. These results suggest that measured property changes originate not only from the shear bands themselves, but also from the affected zones in the adjacent matrix. This work sheds light on direct visualization of deformation-related effects, in particular increased atomic mobility, in the region around shear bands.
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spelling pubmed-48675882016-05-31 Local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation He, Jie Kaban, Ivan Mattern, Norbert Song, Kaikai Sun, Baoan Zhao, Jiuzhou Kim, Do Hyang Eckert, Jürgen Greer, A. Lindsay Sci Rep Article At room temperature, plastic flow of metallic glasses (MGs) is sharply localized in shear bands, which are a key feature of the plastic deformation in MGs. Despite their clear importance and decades of study, the conditions for formation of shear bands, their structural evolution and multiplication mechanism are still under debate. In this work, we investigate the local conditions at shear bands in new phase-separated bulk MGs containing glassy nanospheres and exhibiting exceptional plasticity under compression. It is found that the glassy nanospheres within the shear band dissolve through mechanical mixing driven by the sharp strain localization there, while those nearby in the matrix coarsen by Ostwald ripening due to the increased atomic mobility. The experimental evidence demonstrates that there exists an affected zone around the shear band. This zone may arise from low-strain plastic deformation in the matrix between the bands. These results suggest that measured property changes originate not only from the shear bands themselves, but also from the affected zones in the adjacent matrix. This work sheds light on direct visualization of deformation-related effects, in particular increased atomic mobility, in the region around shear bands. Nature Publishing Group 2016-05-16 /pmc/articles/PMC4867588/ /pubmed/27181922 http://dx.doi.org/10.1038/srep25832 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
He, Jie
Kaban, Ivan
Mattern, Norbert
Song, Kaikai
Sun, Baoan
Zhao, Jiuzhou
Kim, Do Hyang
Eckert, Jürgen
Greer, A. Lindsay
Local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation
title Local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation
title_full Local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation
title_fullStr Local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation
title_full_unstemmed Local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation
title_short Local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation
title_sort local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4867588/
https://www.ncbi.nlm.nih.gov/pubmed/27181922
http://dx.doi.org/10.1038/srep25832
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