Volume 68, Number 2, October 2004
|Page(s)||226 - 232|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 October 2004|
Indications for an “excess wing” in metallic glasses from the mechanical loss modulus in
I. Physikalisches Institut, Georg-August-Universität Göttingen Tammannstr. 1, 37077 Göttingen, Germany
2 Experimentalphysik V, Institut für Physik, Universität Augsburg Universitätsstr. 2, 86135 Augsburg, Germany
Accepted: 24 August 2004
The temperature-dependent complex shear modulus G* of an amorphous, 300 thick film is measured using a double-paddle oscillator as a substrate, oscillating in its torsional eigenmode at about 5440. At high temperatures, the loss modulus is dominated by viscous flow that leads to an α-relaxation peak in the temperature domain. We calculate this peak for our metallic system using the Havriliak-Negami function for the mechanical loss in combination with the Vogel-Fulcher-Tammann equation to describe the temperature-dependent characteristic relaxation time. In the vicinity of the glass transition, we observe a clear experimental deviation from this calculated α-process, which we consider as first indication for the existence of an “excess wing” in metallic systems.
PACS: 64.70.Pf – Glass transitions / 62.40.+i – Anelasticity, internal friction, stress relaxation, and mechanical resonances / 61.25.Mv – Liquid metals and alloys
© EDP Sciences, 2004
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