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Effects Of Cation Segregation At Oxide Grain Boundaries On Grain Boundary Diffusion And Oxidation Kinetics Of Nickel

Published online by Cambridge University Press:  25 February 2011

C. M. Cotelia ,
M. J. Bennett  and
A. J. Garratt-Reed
C. M. Cotelia
Affiliation:
Surface Modification Branch, Naval Research Laboratory, Washington, D.C. 20375, USA
M. J. Bennett
Affiliation:
Surface Science and Technology Department, AEA Industrial Technology, Harwell Laboratory, Didcot, Oxfordshire, OX11 ORA, UK
A. J. Garratt-Reed
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Abstract

The oxidation behavior of Ni, implanted with either divalent Ce2+ or trivalent Y3+, has been studied to test the general applicability of the grain boundary segregation explanation for the reduction in rate of oxidation resulting from reactive element additions to metals that form protective oxide scales. Oxidation of Ce- and Y-implanted Ni at 900°C resulted in grain boundary segregation of the implanted species in the NiO scales formed. The rate of oxidation of Ni was reduced and there was evidence for a change in oxidation mechanism. Additionally, the grain size of the oxides was much smaller. All the observations were entirely consistent with a reduction in cation transport resulting from segregation of foreign ions at the oxide grain boundaries. These results on Ni are compared with recent studies of Ce- and Y-implanted Cr to draw general conclusions about the relationship between grain boundary segregation in oxides and the reactive element effect on oxidation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 439
Copyright
Copyright © Materials Research Society 1992

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References

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