Affiliation:
1. University of Newcastle
Abstract
Tracer diffusion experiments have historically furnished much of the information about
fundamental diffusion processes as embodied in such quantities as tracer correlation factors and
vacancy-atom exchange frequencies. As tracer diffusion experiments using radiotracers are rather
less often performed nowadays, it is important to be able to process other diffusion data to provide
similar fundamental information. New procedures that are primarily based around the random alloy
model have been established recently for analyzing chemical diffusion data in binary and ternary
alloy systems. These procedures are reviewed here. First, we review the random alloy model, the
Sum-rule relating the phenomenological coefficients and three diffusion kinetics formalisms
making use of the random alloy. Next, we show how atom-vacancy exchange frequency ratios and
then component tracer correlation factors can be extracted from chemical diffusion data in alloy
systems. Examples are taken from intrinsic diffusion and interdiffusion data in a number of binary
and ternary alloys.
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Radiation
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