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Percolation in alloys with thermally activated diffusion

Ouyang, H. and Fultz, B. (1989) Percolation in alloys with thermally activated diffusion. Journal of Applied Physics, 66 (10). pp. 4752-4755. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:OUYjap89

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Abstract

For diffusion in a real alloy, some concepts of formal percolation theory may need to be reconsidered because the "immobile" atoms are not truly immobile. Our Monte Carlo simulations of vacancy diffusion on bcc lattices show the existence of a relationship between the activation barrier heights for the vacancy-atom exchanges and the effective percolation threshold concentration. In the language of formal percolation theory, we have modeled this problem by varying the immobile species' barrier height from infinity to some finite value and calculating the resulting percolation threshold. When both species of atoms have a finite mobility, however, our results can be interpreted in terms of probabilities for vacancies to escape local clusters in a fixed amount of time. We find that the dynamical behavior undergoes a marked change above and below the formal percolation threshold, but the strength of the percolating cluster is much less important than in formal percolation theory.


Item Type:Article
Additional Information:Copyright © 1989 American Institute of Physics. (Received 17 April 1989; accepted 27 July 1989) Assistance with computer simulations by L. Anthony is acknowledged. This work was supported by the U.S. Department of Energy under Contract No. DE-FG03-86ER45270.
Subject Keywords:ALLOYS; DIFFUSION; VACANCIES; BCC LATTICES; SIMULATION; MONTE CARLO METHOD; MOBILITY; SOLID CLUSTERS; DYNAMICS; BINARY ALLOY SYSTEMS; PERCOLATION THEORY
Record Number:CaltechAUTHORS:OUYjap89
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:OUYjap89
Alternative URL:http://dx.doi.org/10.1063/1.343785
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8827
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:20 Sep 2007
Last Modified:26 Dec 2012 09:42

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