A New Model of Stress Generation During Scale Growth Limited by Cation/Vacancy Diffusion

  • Teiichi Homma
  • Yung-Ju Pyun

Abstract

The stress generation during growth of cation-diffusing scales on pure metals is described in terms of intrinsic misfit for a grain boundary in oxides. This model is derived from the experimental observations by means of in situ x-ray strain measurements for the oxides grown on single crystal surfaces of copper. A change in the grain boundary structure which occurs by altering the relative amount of the twin-related oxide orientations present in the oxides on (001) or (111) face of copper leads to a change in the stress generation behavior. Compressive stresses are observed in the oxide with scale thickness of a few micrometers below the brittle-ductile transition temperature of the bulk oxide(300 ~ 400°C). The model which is based on the coincident site lattice model may explain the origin of stresses arising during the growth of cation-diffusing scales at rather moderate temperatures.

Keywords

Oxide Scale Stress Generation Surface Orientation Strain Generation Mosaic Structure 
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

© Elsevier Science Publishers Ltd 1989

Authors and Affiliations

  • Teiichi Homma
    • 1
  • Yung-Ju Pyun
    • 1
  1. 1.Institute of Industrial ScienceUniversity of TokyoTokyo 106Japan

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