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Investigation of ordering kinetics in Cu3Au with the tomographic atom probe

Published online by Cambridge University Press:  31 January 2011

S. Duval ,
S. Chambreland ,
A. Loiseau  and
D. Blavette
S. Duval
Affiliation:
Groupe de Métallurgie Physique, UMR CNRS 6634, Université de Rouen, F-76821, Mont Saint Aignan Cedex, France
S. Chambreland
Affiliation:
Groupe de Métallurgie Physique, UMR CNRS 6634, Université de Rouen, F-76821, Mont Saint Aignan Cedex, France
A. Loiseau
Affiliation:
Laboratoire de Physique du Solide/ONERA, BP 72, F-92322 Châtillon Cedex, France
D. Blavette*
Affiliation:
Groupe de Métallurgie Physique, UMR CNRS 6634, Universitée de Rouen, F-76821, Mont Saint Aignan Cedex, France
*
a) Address correspondence to this author.didier.blavette@univrouen.fr
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Abstract

Kinetics of congruent ordering in Cu3Au at 350 °C was investigated by means of a three-dimensional atom probe. This instrument, called a Tomographic Atom Probe (TAP), enables atomic resolution images of a small volume (10 × 10 × 100 nm3) of the material reconstructed in the three dimensions of space. The time evolution of ordered domains at 350 °C shows that a t1/2 law is followed as soon as 5 min. For this aging time, the nucleus diameter is close to 1.7 nm. This scaling law was observed even before domains came into contact (t = 50 min). Competitive growth was observed to start as soon as 5 min. The number density was observed to decrease rapidly up to t = 50 min. A slower decrease was observed when domains begin to impinge. Experimental conditions and requirements as well as advantages of TAP as compared to HREM for the study of ordering are discussed in detail.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 6 , June 1998 , pp. 1502 - 1510
Copyright
Copyright © Materials Research Society 1998

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