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Mechanical Relaxation Time Scales in a Zr–Ti–Ni–Cu–Be Bulk Metallic Glass

Published online by Cambridge University Press:  31 January 2011

Daewoong Suh  and
Reinhold H. Dauskardt
Daewoong Suh
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305–2205
Reinhold H. Dauskardt
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305–2205
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Abstract

The relaxation time scales in a commercial-grade Zr41.25Ti13.75Ni10Cu12.5Be22.5 (at.%) bulk metallic glass were examined using transient and dynamic mechanical experiments. The viscoelastic and sub-Tg relaxations were well described by the Kohlrausch–Williams–Watts relaxation function. A large activation energy (4.0 eV) and small nonexponentiality parameter (approximately 0.5) were observed for viscoelastic relaxation above Tg consistent with the cooperative nature of atomic movements leading ultimately to viscous flow. Conversely, a small activation energy (0.1 eV) and large nonexponentiality parameter (approximately 0.9) were observed for the sub-Tg relaxation suggesting localized atomic adjustments which may involve different structural units or mechanisms. The glass transition was manifested as a decoupling of the sub-Tg and viscoelastic relaxation. The resulting transition temperature determined at a selected time scale was in agreement with the value obtained from calorimetric studies.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 17 , Issue 6 , June 2002 , pp. 1254 - 1257
Copyright
Copyright © Materials Research Society 2002

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