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Modelling of Metal-Oxide Interface Behaviour During Oxide Scale Growth Controlled by Cation Diffusion

  • B. Pieraggi
Part of the NATO ASI Series book series (NSSE, volume 173)

Abstract

The growth of cation-diffusing scales on pure metals is described from a modelling of metal-scale interface in terms of intrinsic dislocations for an epitaxial scale; such a model is consistent with the experimental observations. It is proposed that the annihilation of cationic vacancies occurs at the metal-scale interface by the climb into the metal of some fraction of the intrinsic misfit interface dislocations, a process which generates tensile stress in the metal and compression in the scale. Above a critical interfacial strain, the glide of dislocations in the metal, in combination with dislocation glide in the scale, recreates the interface dislocations. These processes provide plastic deformation in both phases near the interface and maintain metal-scale epitaxy during oxide growth. The model may explain the origin of stresses arising during the growth of cation-diffusing scales on an extensive flat surface.

Keywords

Oxide Scale Nickel Oxide Growth Stress Oxide Growth Scale Growth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • B. Pieraggi
    • 1
  1. 1.Lab. Physical MetallurgyURA CNRS 445, ENSCTToulouseFrance

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