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Microstructural Evolution in Nanocrystalline Ni Coatings

Published online by Cambridge University Press:  31 January 2011

M. L. Lau ,
J. He ,
A. J. Melmed ,
T. A. Lusby ,
R. Schweinfest ,
M. Rühle  and
E. J. Lavernia
M. L. Lau
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697–2575
J. He
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697–2575
A. J. Melmed
Affiliation:
Materials Science and Engineering Department, Johns Hopkins University, Baltimore, Maryland 21218–2689
T. A. Lusby
Affiliation:
Materials Science and Engineering Department, Johns Hopkins University, Baltimore, Maryland 21218–2689
R. Schweinfest
Affiliation:
Max-Planck-Institute für Metallforschung, Seestrasse 92, D-70174 Stuttgart, Germany
M. Rühle
Affiliation:
Max-Planck-Institute für Metallforschung, Seestrasse 92, D-70174 Stuttgart, Germany
E. J. Lavernia
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697–2575
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Extract

Gas-atomized Ni powders were mechanically milled under liquid nitrogen and subsequently sprayed using a high-velocity oxygen-fuel thermal spraying system. The resultant coatings were evaluated using various analytical methods, including scanning electron microscopy (SEM), transmission electron microscopy, and atom probe field ion microscopy (APFIM). The results indicated that the majority of the grains in nanocrystalline Ni coating were equiaxed with an average grain size of 50 ± 23 nm. SEM elemental dot mapping analysis suggested that oxide particles were distributed along the prior droplet boundaries and interpass boundaries in the coatings. The APFIM analysis indicated that the distribution of oxygen was very inhomogeneous in the nanocrystalline coating samples studied. Mostly small NiO precipitates with a size range of 1–7 nm were found throughout the grains, and the average size of these precipitates was approximately 4 nm. However, large oxide precipitates with a size up to 55 nm were also observed. In addition, increased amounts of oxygen were found at the grain boundaries and at structural defects.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 1041 - 1049
Copyright
Copyright © Materials Research Society 2002

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