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Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy

Supercooled liquids exhibit spatial heterogeneity in the dynamics of their fluctuating atomic arrangements. The length and time scales of the heterogeneous dynamics are central to the glass transition and influence nucleation and growth of crystals from the liquid. Here, we report direct experimenta...

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Autores principales: Zhang, Pei, Maldonis, Jason J., Liu, Ze, Schroers, Jan, Voyles, Paul M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5859095/
https://www.ncbi.nlm.nih.gov/pubmed/29555920
http://dx.doi.org/10.1038/s41467-018-03604-2
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author Zhang, Pei
Maldonis, Jason J.
Liu, Ze
Schroers, Jan
Voyles, Paul M.
author_facet Zhang, Pei
Maldonis, Jason J.
Liu, Ze
Schroers, Jan
Voyles, Paul M.
author_sort Zhang, Pei
collection PubMed
description Supercooled liquids exhibit spatial heterogeneity in the dynamics of their fluctuating atomic arrangements. The length and time scales of the heterogeneous dynamics are central to the glass transition and influence nucleation and growth of crystals from the liquid. Here, we report direct experimental visualization of the spatially heterogeneous dynamics as a function of temperature in the supercooled liquid state of a Pt-based metallic glass, using electron correlation microscopy with sub-nanometer resolution. An experimental four-point space-time correlation function demonstrates a growing dynamic correlation length, ξ, upon cooling of the liquid toward the glass transition temperature. ξ as a function of the relaxation time τ are in good agreement with Adam-Gibbs theory, inhomogeneous mode-coupling theory and random first-order transition theory of the glass transition. The same experiments demonstrate the existence of a nanometer thickness near-surface layer with order of magnitude shorter relaxation time than inside the bulk.
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spelling pubmed-58590952018-03-21 Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy Zhang, Pei Maldonis, Jason J. Liu, Ze Schroers, Jan Voyles, Paul M. Nat Commun Article Supercooled liquids exhibit spatial heterogeneity in the dynamics of their fluctuating atomic arrangements. The length and time scales of the heterogeneous dynamics are central to the glass transition and influence nucleation and growth of crystals from the liquid. Here, we report direct experimental visualization of the spatially heterogeneous dynamics as a function of temperature in the supercooled liquid state of a Pt-based metallic glass, using electron correlation microscopy with sub-nanometer resolution. An experimental four-point space-time correlation function demonstrates a growing dynamic correlation length, ξ, upon cooling of the liquid toward the glass transition temperature. ξ as a function of the relaxation time τ are in good agreement with Adam-Gibbs theory, inhomogeneous mode-coupling theory and random first-order transition theory of the glass transition. The same experiments demonstrate the existence of a nanometer thickness near-surface layer with order of magnitude shorter relaxation time than inside the bulk. Nature Publishing Group UK 2018-03-19 /pmc/articles/PMC5859095/ /pubmed/29555920 http://dx.doi.org/10.1038/s41467-018-03604-2 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
Zhang, Pei
Maldonis, Jason J.
Liu, Ze
Schroers, Jan
Voyles, Paul M.
Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy
title Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy
title_full Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy
title_fullStr Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy
title_full_unstemmed Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy
title_short Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy
title_sort spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5859095/
https://www.ncbi.nlm.nih.gov/pubmed/29555920
http://dx.doi.org/10.1038/s41467-018-03604-2
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