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Small Atom Diffusion and Breakdown on Stokes-Einstein Relation in the Supercooled Liquid State of Zr-Ti-Cu-Ni-Be Alloys

Published online by Cambridge University Press:  10 February 2011

U. Geyer ,
S. Schneider ,
Y. Qiu ,
M.-P. Macht ,
T. A. Tombrello  and
W. L. Johnson
U. Geyer
Affiliation:
I. Phys. Institut and SFB 345, Universität Göttingen, 37073 Göttingen, Germany
S. Schneider
Affiliation:
I. Phys. Institut and SFB 345, Universität Göttingen, 37073 Göttingen, Germany
Y. Qiu
Affiliation:
California Institute of Technology, Pasadena, CA 91125, USA
M.-P. Macht
Affiliation:
Hahn-Meitner-Institut Berlin, Abt. Strukturforschung, 14109 Berlin, Germany
T. A. Tombrello
Affiliation:
California Institute of Technology, Pasadena, CA 91125, USA
W. L. Johnson
Affiliation:
California Institute of Technology, Pasadena, CA 91125, USA
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Abstract

Be diffusivity data in the bulk metallic glass forming alloys Zr41.2Ti13.8Cu12.5Ni10Be22.5 and Zr46.7Ti8.3Cu7.5Ni10Be27.5 are reported for temperatures between 530K and 710K, extending up to 80K into the supercooled liquid states of the alloys. At the glass transition temperature, Tg, a change in temperature dependence of the data is observed in both alloys, and above Tg the diffusivity increases faster with temperature than below. The data in the supercooled liquid can be described by a modified Arrhenius expression containing the communal entropy of the supercooled liquid and based on a diffusion mechanism suggested earlier. The comparison with viscosity data in the supercooled liquid state of Zr46.7Ti8.3Cu7.5Ni10Be27.5 reveals a breakdown of the Stokes- Einstein relation, whereas D(T) and η(T) follow a relation close to van den Beu-kel's. The breakdown of the Stokes- Einstein relation indicates a cooperative diffusion mechanism in the supercooled liquid state of the ZrTiCuNiBe alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 301
Copyright
Copyright © Materials Research Society 1997

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References

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