CaltechAUTHORS
  A Caltech Library Service

Beryllium Diffusion in the Supercooled Liquid and Glassy State of the Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) Alloy

Geyer, U. and Schneider, S. and Qiu, Y. and Macht, M.-P. and Tombrello, T. A. and Johnson, W. L. (1996) Beryllium Diffusion in the Supercooled Liquid and Glassy State of the Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) Alloy. In: Metastable, Mechanically Alloyed and Nanocrystalline Materials. Materials Science Forum. No.225. Transtec Publications , pp. 89-94. ISBN 0-87849-738-2. http://resolver.caltech.edu/CaltechAUTHORS:20141029-070159868

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20141029-070159868

Abstract

The self diffusivity of Be in the bulk metallic amorphous Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) alloy is investigated by high energy elastic backscattering of ^4He^(2+) ions in the temperature range between 433K and 663K. Below the glass transition temperature, the data suggest a single atomic jump diffusion behavior of Be with a migration enthalpy of 1.05eV/atom and a pre-exponential factor of 1.8·10^(-11)m^2/s. Above the glass transition, the diffusivity of Be increases by two orders of magnitude over a temperature interval of 40K. By taking into account the change in configurational entropy due to the glass transition, we can explain the mechanism for diffusion of Be in the supercooled liquid state of Zr_(41.2)Ti_(13.0)Ni _(10)Cu_(12.5)Be_(22.5) by single atomic jumps in a slowly changing configuration of neighboring atoms. The corresponding migration enthalpy is the same as in the solid glass, and the number of neighboring atoms which influence the diffusion of Be is about 22.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://www.scientific.net/MSF.225-227.89PublisherArticle
http://www.scientific.net/MSF.225-227/2PublisherArticle
Additional Information:© 1996 Transtec Publications. This work was supported by the U.S. Dept. of Energy under Grant No. DE-FG03-86ER45242, by the DFG via SFB 345, by the National Science Foundation [Grant DMR93-18931], and by the U.S. Army Research Office [Grant DAAH04-95-1-0233].
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-86ER45242
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
NSFDMR93-18931
Army Research Office (ARO)DAAH04-95-1-0233
Record Number:CaltechAUTHORS:20141029-070159868
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141029-070159868
Official Citation:Beryllium Diffusion in the Supercooled Liquid and Glassy State of the Zr41.2Ti13.8Cu12.5Ni10Be22.5 Alloy, p.89 U. Geyer et al., 1996, Materials Science Forum, 225-227
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50976
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:29 Oct 2014 16:27
Last Modified:29 Oct 2014 16:27

Repository Staff Only: item control page