Measurements of slowβ-relaxations in metallic glasses and supercooled liquids

Abstract

Dynamic mechanical measurements were performed on a series of strong and fragile metallic glass-forming liquids in isochronous and isothermal routes. Our results indicate that slow $\ensuremath{\beta}$-relaxation mode is ubiquitous in metallic glass-forming systems though it may manifest as an excess wing in strong glasses due to strong coupling with the $\ensuremath{\alpha}$-relaxation. Furthermore, we find that the degree of coupling between $\ensuremath{\alpha}$-relaxation and slow $\ensuremath{\beta}$-relaxation correlates with the fragility of these glass-forming liquids. The possible mechanism and the connections between $\ensuremath{\alpha}$-relaxation and slow $\ensuremath{\beta}$-relaxation are discussed.