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Ion-beam mixing of Ni/Pd layers: II. Thermally assisted regime (>500K)

Published online by Cambridge University Press:  31 January 2011

U. G. Akano ,
D. A. Thompson ,
W. W. Smeltzer  and
J. A. Davies
U. G. Akano
Affiliation:
Department of Engineering Physics and Institute for Materials Research, McMaster University, Hamilton, Ontario L8S4MI, Canada
D. A. Thompson
Affiliation:
Department of Engineering Physics and Institute for Materials Research, McMaster University, Hamilton, Ontario L8S4MI, Canada
W. W. Smeltzer
Affiliation:
Department of Engineering Physics and Institute for Materials Research, McMaster University, Hamilton, Ontario L8S4MI, Canada
J. A. Davies
Affiliation:
Department of Engineering Physics and Institute for Materials Research, McMaster University, Hamilton, Ontario L8S4MI, Canada
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Abstract

Atomic mixing in Ni/Pd bilayer films due to 120 keV Ar+ irradiation in the thermally assisted regime (523−673 K) has been measured, in situ, using Rutherford backscattering with 2.0 MeV 4He+ ions. The mean diameter of grains in these polycrystallinc films increased from 10 to 60 nm, following Ar+ bombardment at 573 K. Initial mixing was rapid due to grain boundary diffusion and incorporation of the metal solute into the solvent metal matrix by grain growth; this mixing stage was essentially complete within 10 min for annealed films or after an Ar+ dose of 4 × 1015 cm−2 in irradiated films (10 min irradiation). No further measurable mixing occurred in the annealed, unirradiated films. For the irradiated samples the initial rapid mixing (6−35 atoms/ion) was followed by a slower mixing stage of 0.7–1.8 atoms/ion for irradiation doses of up to 2.5 × 1016 Ar+ cm−2. The Ar+ bombardment gave rise to much smaller mixing levels when the Pd films were deposited on large-grain or single-crystal Ni. A diffusion analysis demonstrates that the effective diffusivity, Deff, for ion-irradiation-enhanced mixing in the thermally assisted regime satisfied the relation Dl < Deff < DB, where the ratio of the grain boundary to lattice diffusivity was DB/Dl > 106.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 6 , December 1988 , pp. 1063 - 1071
Copyright
Copyright © Materials Research Society 1988

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References

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