Anti-Aging in Ultrastable Metallic Glasses.
Phys Rev Lett
; 120(13): 135504, 2018 Mar 30.
Article
em En
| MEDLINE
| ID: mdl-29694174
ABSTRACT
As ultrastable metallic glasses (UMGs) are promising candidates to solve the stability issues of conventional metallic glasses, their study is of exceptional interest. By means of x-ray photon correlation spectroscopy, we have investigated the stability of UMGs at the atomic level. We find a clear signature of ultrastability at the atomic level that results in slower relaxation dynamics of UMGs with respect to conventional (rapidly quenched) metallic glasses, and in a peculiar acceleration of the dynamics by near T_{g} annealing. This surprising phenomenon, called here anti-aging, can be understood in the framework of the potential energy landscape. For all samples, the structural relaxation process can be described with a highly compressed shape of the density fluctuations, unaffected by thermal treatments and regardless of the ultrastability of the glass.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2018
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Article