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On the Phase Formation During Ion-Beam Mixing

Published online by Cambridge University Press:  25 February 2011

L.-U. Aaen Andersen ,
J. Bøttiger  and
k. Dyrbye
L.-U. Aaen Andersen
Affiliation:
Institute of Physics, University of Aarhus DK-8000 Aarhus C, Denmark
J. Bøttiger
Affiliation:
Institute of Physics, University of Aarhus DK-8000 Aarhus C, Denmark
k. Dyrbye
Affiliation:
Institute of Physics, University of Aarhus DK-8000 Aarhus C, Denmark
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Abstract

The phase formation during ion-beam mixing of binary transition-metal alloys has been studied by use of Xe* , Ar* , and Ne* as a function of temperature and composition. Especially the composition ranges, where only amorphous phases occur, i.e., the glass-forming ranges, have been investigated. Based on semiempi-rical data on free energies, metastable phase diagrams have been constructed and glass-forming ranges estimated for the case of negative heat of mixing. Taking into account the quite large uncertainties of the applied thermodynamic data, reasonable agreement is observed between estimated and experimental glass-forming ranges. In the case of positive heat of mixing, the initial thin-film structure is near thermodynamic equilibrium. However, for small values of the heat of mixing, it is still possible to form amorphous structures. In the absence of chemical driving forces, this formation cannot be explained in a similar way as in the case of negative heat of mixing. As the nucleation of crystalline phases may differ with and without irradiation, irradiation of amorphous structures at elevated temperatures may create new metastable phases. Preliminary measurement of crystallization of metallic-glass films during irradiation are reported.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 157: Symposium A – Beam-Solid Interactions: Physical Phenomena , 1989 , 187
Copyright
Copyright © Materials Research Society 1990

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References

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