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The Earliest Stage of the Solid State Amorphization Reaction in the Zr-Co System

Published online by Cambridge University Press:  15 February 2011

Ralf Busch ,
Frank Gaertner ,
Susanne Schneider ,
Rüdiger Bormann  and
Peter Haasen
Ralf Busch
Affiliation:
Institutfur Metallphysik, Universitat Gottingen, Hospitalstr. 3-7, D-37073 Gbttingen, Germany W.M.Keck Laboratory of Engineering Materials, 138-78, California Institute of Technology, Pasadena, CA 91125
Frank Gaertner
Affiliation:
Institutfur Metallphysik, Universitat Gottingen, Hospitalstr. 3-7, D-37073 Gbttingen, Germany
Susanne Schneider
Affiliation:
Physikalisches Institut, Universitat Gottingen, Bunsenstr.9, D-37073 Gottingen, Germany W.M.Keck Laboratory of Engineering Materials, 138-78, California Institute of Technology, Pasadena, CA 91125
Rüdiger Bormann
Affiliation:
Institute for Materials Research, GKSS Research Center, D-21502 Geesthacht, Germany
Peter Haasen
Affiliation:
Institutfur Metallphysik, Universitat Gottingen, Hospitalstr. 3-7, D-37073 Gbttingen, Germany
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Abstract

Based on atom probe field ion microscopy (AP/FIM) studies, electromotive force (EMF) measurements and CALPHAD calculations we discuss the earliest stage of the solid state amorphization reaction (SSAR) in Zr/Co-layers. The AP measurements show that two amorphous phases are formed at the Zr/Co interface from the early stages of the reaction. The metastable two phase field between these amorphous phases is shown by direct measurement of the chemical potential of Zr in amorphous co-sputtered ZrCo alloys by the EMF method. The comparison between the atom probe data and the CALPHAD calculation shows that the interfaces between the different layers are far away from metastable equilibrium in the beginning of the reaction. The amorphous phase formation at the Zr/Co interface and in the hcp-Zr grain boundary is preceded by a supersaturation of the hep ZrCo solid solution that transforms polymorphically into the amorphous state.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 343: Symposium H – Polycrystalline Thin Films - Structure, Texture, Properties and Applications , 1994 , 229
Copyright
Copyright © Materials Research Society 1994

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References

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