Characterization of mechanical relaxation in a Cu-Zr-Al metallic glass
The temperature dependence of the relaxation times of Cu46Zr46Al8 glass was measured by means of mechanical spectroscopy and static stress-relaxation measurements. The weak intensity of secondary relaxation in this alloy allows us to correlate the characteristic times of dynamic and static measureme...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/84527 |
| Acceso en línea: | https://hdl.handle.net/2117/84527 https://dx.doi.org/10.1016/j.jallcom.2014.10.101 |
| Access Level: | acceso abierto |
| Palabra clave: | Metallic glasses Amorphous alloys Aging Johari-Goldstein relaxation Mechanical spectroscopy Glass dynamics JOHARI-GOLDSTEIN RELAXATION STRUCTURAL RELAXATION THERMAL-STABILITY BETA-RELAXATION TEMPERATURE VISCOSITY LIQUIDS PLASTICITY TRANSITION DYNAMICS Vidres metàl·lics Àrees temàtiques de la UPC::Física |
| Sumario: | The temperature dependence of the relaxation times of Cu46Zr46Al8 glass was measured by means of mechanical spectroscopy and static stress-relaxation measurements. The weak intensity of secondary relaxation in this alloy allows us to correlate the characteristic times of dynamic and static measurements of primary relaxation. The glassy dynamics of an isoconfigurational state are found to follow an Adam-Gibbs-Vogel expression with the glassy state defined by a fictive temperature. The combination of both measurements proves that, in the frequency domain, the relaxation response can be well described by a single relaxation function above and below the glass transition. The change in relaxation times as function of the fictive temperature and the corresponding effects on the mechanical behavior are estimated and discussed. (C) 2014 Elsevier B.V. All rights reserved. |
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