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Decomposition of Unstable Supersaturated Cu90Co10 Solid Solutions

Published online by Cambridge University Press:  15 February 2011

Ralf Busch ,
Frank Gärtner ,
Christine Borchers ,
Peter Haasen  and
Rüdiger Bormann
Ralf Busch
Affiliation:
Institut für Metallphysik, Universität Göttingen, Hospitalstr. 3-7, D-37073 Göttingen, Germany
Frank Gärtner
Affiliation:
Institut für Metallphysik, Universität Göttingen, Hospitalstr. 3-7, D-37073 Göttingen, Germany
Christine Borchers
Affiliation:
Institut für Metallphysik, Universität Göttingen, Hospitalstr. 3-7, D-37073 Göttingen, Germany
Peter Haasen
Affiliation:
Institut für Metallphysik, Universität Göttingen, Hospitalstr. 3-7, D-37073 Göttingen, Germany
Rüdiger Bormann
Affiliation:
Institute for Materials Research, GKSS Research Center, D-21502 Geesthacht, Germany
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Abstract

Homogeneous Cu90Co10 alloys were prepared by rapid solidification using the meltspin technique. The decomposition process of this highly supersaturated unstable solid solution was investigated on a nanometer scale using a combination of atom probe field ion microscopy (AP/FIM) analyses and transmission electron microscopy.

Annealing of the Cu90Co10 alloys at 440°C for various times leads to the formation of a compositional modulated microstructure within the grains. The composition profiles determined by AP/FIM analyses clearly exclude a classical nucleation and growth behavior of Co-rich particles. The microstructure is modulated with two different wavelengths. In addition, chemical ordering perpendicular to [111] directions of the fee lattice is observed.

At the grain boundaries of this alloy, heterogeneous nucleation of pure Co particles is observed. This heterogeneous nucleation process competes with the decomposition within the grains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 125
Copyright
Copyright © Materials Research Society 1996

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