2024-03-29T13:21:08Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2186362021-12-27T16:47:32Zcom_10261_115com_10261_3col_10261_368
DIGITAL.CSIC
author
Monnier, Xavier
author
Cangialosi, Daniele
author
Ruta, Beatrice
author
Busch, Rafael
author
Gallino, Isabella
funder
Ministerio de Ciencia, Innovación y Universidades (España)
funder
Agencia Estatal de Investigación (España)
funder
Eusko Jaurlaritza
funder
German Research Foundation
funder
European Commission
funder
German Federation of Industrial Research Associations
funder
Centre National de la Recherche Scientifique (France)
orcid
Cangialosi, Daniele [0000-0002-5782-7725]
2020-08-26T07:22:21Z
2020-08-26T07:22:21Z
2020
Science Advances 6(17): eaay1454 (2020)
http://hdl.handle.net/10261/218636
10.1126/sciadv.aay1454
2375-2548
http://dx.doi.org/10.13039/501100000780http://dx.doi.org/10.13039/501100011033http://dx.doi.org/10.13039/501100004794http://dx.doi.org/10.13039/501100002723http://dx.doi.org/10.13039/501100003086http://dx.doi.org/10.13039/501100001659
32494629
Understanding how glasses form, the so-called vitrification, remains a major challenge in materials science. Here, we study vitrification kinetics, in terms of the limiting fictive temperature, and atomic mobility related to the α-relaxation of an Au-based bulk metallic glass former by fast scanning calorimetry. We show that the time scale of the α-relaxation exhibits super-Arrhenius temperature dependence typical of fragile liquids. In contrast, vitrification kinetics displays milder temperature dependence at moderate undercooling, and thereby, vitrification takes place at temperatures lower than those associated to the α-relaxation. This finding challenges the paradigmatic view based on a one-to-one correlation between vitrification, leading to the glass transition, and the α-relaxation. We provide arguments that at moderate to deep undercooling, other atomic motions, which are not involved in the α-relaxation and that originate from the heterogeneous dynamics in metallic glasses, contribute to vitrification. Implications from the viewpoint of glasses fundamental properties are discussed.
eng
openAccess
Vitrification decoupling from α-relaxation in a metallic glass
artículo
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URL
https://digital.csic.es/bitstream/10261/218636/1/vitrifglas.pdf
File
MD5
3832701895f1b572b94622b050bfd376
521942
application/pdf
vitrifglas.pdf