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Effect of Carbon on Ion Beam Mixing of Fe-Ti Bilayers

Published online by Cambridge University Press:  25 February 2011

J-P. Hirvonen ,
M. Nastasi ,
R. Lappalainen  and
K. Sickafus
J-P. Hirvonen
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, NM 87545
M. Nastasi
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, NM 87545
R. Lappalainen
Affiliation:
Department of Physics, University of Helsinki, 00170 Helsinki, Finland
K. Sickafus
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, NM 87545
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Abstract

The influence of implanted carbon on ion beam mixing of a Fe-Ti system was investigated. Carbon was introduced into bilayer samples by implanting 13C isotopes. The implantation energies were selected to set the mean range of carbon ions in either the iron or titanium layer. The effect of implanted carbon on 400 keV Ar ion mixing in the temperature range from 0 to 300 °C was studied using Rutherford backscattering spectroscopy at the energy of 5 MeV. Changes in carbon concentration profiles were probed utilizing the resonance of the nuclear reaction l3C(p,y)14N at the proton energy of 1.748 MeV. The measurements revealed that mixing was not affected by carbon implanted into the titanium layer. However, carbon in the iron layer remarkably retarded mixing at all temperatures investigated. Significant changes in carbon depth distributions were observed only when the sample with implanted carbon in the iron layer was mixed at 300 °C. These result are explained in terms of the enhanced mobility of carbon in an evaporated iron film which allows segregation to the interface. At low temperatures, however, vacancy-carbon interaction in iron may have a contribution to the retarded ion beam mixing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 157: Symposium A – Beam-Solid Interactions: Physical Phenomena , 1989 , 203
Copyright
Copyright © Materials Research Society 1990

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References

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