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Solid-state amorphization, interdiffusion, and ion-beam mixing in Au/Zr and Ni/Zr

Published online by Cambridge University Press:  31 January 2011

Fu-Rong Ding ,
P. R. Okamoto  and
L. E. Rehn
Fu-Rong Ding
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
P. R. Okamoto
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
L. E. Rehn
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

Inert-gas markers, Rutherford backscattering, and x-ray diffraction were used to investigate solid-state interdiffusion in Ni/Zr and Au/Zr bilayer films as a function of temperature; microstructural studies during annealing were performed in situ, in a high-voltage electron microscope. Au, in contrast to Ni, is not an anomalously fast diffuser in crystalline Zr. Nevertheless, an amorphous product phase was found in both alloy systems for reaction temperatures  550 K; heterogeneous nucleation of the amorphous phase was observed in Au/Zr. The interdiffusion data reveal two distinct Arrhenius regimes, 330–∼470 K and ∼480–550 K, with quite different apparent activation enthalpies. These thermal interdiffusion results are compared with temperature dependent studies of ion-beam mixing in similar bilayer specimens. This comparison indicates that the enhanced efficiencies observed for ion-beam mixing above ∼480 K result from the as-prepared metastable microstructurc, and are not due to radiation-enhanced diffusion.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 6 , December 1989 , pp. 1444 - 1449
Copyright
Copyright © Materials Research Society 1989

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References

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