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Surface mechanical properties of C implanted Ni

Published online by Cambridge University Press:  31 January 2011

M. Nastasi ,
J. -P. Hirvonen ,
T. R. Jervis ,
G. M. Pharr  and
W. C. Oliver
M. Nastasi
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, New Mexico 87545
J. -P. Hirvonen
Affiliation:
Department of Physics, University of Helsinki, Helsinki, Finland
T. R. Jervis
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, New Mexico 87545
G. M. Pharr
Affiliation:
Department of Materials Science, Rice University, Houston, Texas 77251
W. C. Oliver
Affiliation:
Metals and Ceramic Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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Abstract

Nickel foils, 165 μm thick, have been carbon implanted at 300 K with 2, 3, and 4.2 × 1017 C ions/cm2 and implanted with a two-step implantation of 2.1 × 1017 C/cm2 at 300 K followed by 2.1 × 1017 C/cm2 at 77 K. All implantations performed at 300 K result in the formation of the metastablc phase Ni3C while the two-step implantation produces an amorphous Ni/C alloy. Surface mechanical property studies showed that both the surface hardness and wear properties are correlated with chemistry (carbon dose), and that the friction coefficient is additionally dependent on the surface microstructure. It was found that both the wear rate and coefficient of friction were reduced as the volume fracion of Ni3C increased. At the highest dose implanted 4.2 × 1017 C/cm7, the coefficient of friction was found to be lower for the sample implanted half at 300 K and half at 77 K and possessing an amorphous structure compared to the sample implanted entirely at 300 K and possessing a crystalline Ni3C structure. Increases in the surface hardness were also observed with increasing carbon content, with the greatest hardness observed in samples implanted to a total dose of 4.2 × 1017 C/cm2. The hardness at this dose was not dependent on the implant conditions or the metastable phase formed.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 2 , April 1988 , pp. 226 - 232
Copyright
Copyright © Materials Research Society 1988

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