CaltechAUTHORS
  A Caltech Library Service

Small atom diffusion and breakdown of the Stokes–Einstein relation in the supercooled liquid state of the Zr46.7Ti8.3Cu7.5Ni10Be27.5 alloy

Geyer, U. and Johnson, W. L. and Schneider, S. and Qiu, Y. and Tombrello, T. A. and Macht, M.-P. (1996) Small atom diffusion and breakdown of the Stokes–Einstein relation in the supercooled liquid state of the Zr46.7Ti8.3Cu7.5Ni10Be27.5 alloy. Applied Physics Letters, 69 (17). pp. 2492-2494. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:GEYapl96

[img]
Preview
PDF
See Usage Policy.

74Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:GEYapl96

Abstract

Be diffusivity data in the bulk metallic glass forming alloy Zr46.7Ti8.3Cu7.5Ni10Be27.5 are reported for temperatures between 530 and 710 K, extending 85 K into the supercooled liquid state of the alloy. At the glass transition temperature Tg, a change in temperature dependence of the data is observed, and above Tg the diffusivity increases more quickly with temperature than below. The data in the supercooled liquid can be described by a modified Arrhenius expression 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, indicating a cooperative diffusion mechanism in the supercooled liquid state of Zr46.7Ti8.3Cu7.5Ni10Be27.5.


Item Type:Article
Additional Information:©1996 American Institute of Physics. Received 25 June 1996; accepted 16 August 1996. This work was supported in part (U.G.) by the U.S. Army Research Office (Grant No. DAAH04-95-1-0233), and in part (S.S.) by the U.S. Dept. of Energy under Grant No. DE-FG03-86ER45242, by the Deutsche Forschungsgemeinschaft via SFB 345 (S.S.), and by the National Science Foundation [Grant No. DMR93-18931 (Y.Q. & T.A.T.)].
Subject Keywords:ZIRCONIUM ALLOYS; TITANIUM ALLOYS; COPPER ALLOYS; NICKEL ALLOYS; BERYLLIUM ALLOYS; SELF–DIFFUSION; METALLIC GLASSES; TEMPERATURE DEPENDENCE; LIQUID METALS; VISCOSITY; ARRHENIUS EQUATION
Record Number:CaltechAUTHORS:GEYapl96
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:GEYapl96
Alternative URL:http://dx.doi.org/10.1063/1.117716
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4558
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Aug 2006
Last Modified:26 Dec 2012 09:00

Repository Staff Only: item control page