Abnormal correlation between phase transformation and cooling rate for pure metals

This work aims to achieve deep insight into the phenomenon of phase transformation upon rapid cooling in metal systems and reveal the physical meaning of scatter in the time taken to reach crystallization. The total number of pure metals considered in this work accounts for 14. Taking pure copper as...

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Detalles Bibliográficos
Autores principales: Han, J. J., Wang, C. P., Liu, X. J., Wang, Y., Liu, Z.-K., Zhang, T.-Y., Jiang, J. Z.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4778031/
https://www.ncbi.nlm.nih.gov/pubmed/26939584
http://dx.doi.org/10.1038/srep22391
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author Han, J. J.
Wang, C. P.
Liu, X. J.
Wang, Y.
Liu, Z.-K.
Zhang, T.-Y.
Jiang, J. Z.
author_facet Han, J. J.
Wang, C. P.
Liu, X. J.
Wang, Y.
Liu, Z.-K.
Zhang, T.-Y.
Jiang, J. Z.
author_sort Han, J. J.
collection PubMed
description This work aims to achieve deep insight into the phenomenon of phase transformation upon rapid cooling in metal systems and reveal the physical meaning of scatter in the time taken to reach crystallization. The total number of pure metals considered in this work accounts for 14. Taking pure copper as an example, the correlation between phase selection of crystal or glass and cooling rate was investigated using molecular dynamic simulations. The obtained results demonstrate that there exists a cooling rate region of 6.3 × 10(11)–16.6 × 10(11) K/s, in which crystalline fractions largely fluctuate along with cooling rates. Glass transformation in this cooling rate region is determined by atomic structure fluctuation, which is controlled by thermodynamic factors. According to the feature of bond-orientation order at different cooling rates, we propose two mechanisms of glass formation: (i) kinetic retardation of atom rearrangement or structural relaxation at a high cooling rate; and (ii) competition of icosahedral order against crystal order near the critical cooling rate.
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spelling pubmed-47780312016-03-09 Abnormal correlation between phase transformation and cooling rate for pure metals Han, J. J. Wang, C. P. Liu, X. J. Wang, Y. Liu, Z.-K. Zhang, T.-Y. Jiang, J. Z. Sci Rep Article This work aims to achieve deep insight into the phenomenon of phase transformation upon rapid cooling in metal systems and reveal the physical meaning of scatter in the time taken to reach crystallization. The total number of pure metals considered in this work accounts for 14. Taking pure copper as an example, the correlation between phase selection of crystal or glass and cooling rate was investigated using molecular dynamic simulations. The obtained results demonstrate that there exists a cooling rate region of 6.3 × 10(11)–16.6 × 10(11) K/s, in which crystalline fractions largely fluctuate along with cooling rates. Glass transformation in this cooling rate region is determined by atomic structure fluctuation, which is controlled by thermodynamic factors. According to the feature of bond-orientation order at different cooling rates, we propose two mechanisms of glass formation: (i) kinetic retardation of atom rearrangement or structural relaxation at a high cooling rate; and (ii) competition of icosahedral order against crystal order near the critical cooling rate. Nature Publishing Group 2016-03-04 /pmc/articles/PMC4778031/ /pubmed/26939584 http://dx.doi.org/10.1038/srep22391 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
Han, J. J.
Wang, C. P.
Liu, X. J.
Wang, Y.
Liu, Z.-K.
Zhang, T.-Y.
Jiang, J. Z.
Abnormal correlation between phase transformation and cooling rate for pure metals
title Abnormal correlation between phase transformation and cooling rate for pure metals
title_full Abnormal correlation between phase transformation and cooling rate for pure metals
title_fullStr Abnormal correlation between phase transformation and cooling rate for pure metals
title_full_unstemmed Abnormal correlation between phase transformation and cooling rate for pure metals
title_short Abnormal correlation between phase transformation and cooling rate for pure metals
title_sort abnormal correlation between phase transformation and cooling rate for pure metals
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4778031/
https://www.ncbi.nlm.nih.gov/pubmed/26939584
http://dx.doi.org/10.1038/srep22391
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