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- W2024761430 abstract "Abstract Diffusion of oxygen through columnar grain boundaries formed during processing of coatings can lead to internal oxidation and the formation of oxide inclusions in close proximity to a free surface. Since oxidation is accompanied by an increase in volume, large misfit strains are generated at the inclusions. In view of the close proximity of a free surface, the misfit induces large hydrostatic stresses in the elastic medium surrounding the inclusion. These stresses have been determined exactly for a cylindrical inclusion using linear elasticity theory and stresses for a spherical inclusion have been estimated using these exact solutions. These stresses seem to be significant in that they could lead to fracture or prismatic dislocation punching in a coating. In addition, it is shown that these hydrostatic stresses can accelerate kinetics of diffusion of the damaging species and lead to rapid deterioration of the coating. Furthermore, the stresses can induce the formation of pits at the coating surface which can grow into cracks and lead to failure of the coating." @default.
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- W2024761430 date "1987-11-01" @default.
- W2024761430 modified "2023-10-17" @default.
- W2024761430 title "On deleterious effects of oxide particles proximate to free surfaces" @default.
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- W2024761430 doi "https://doi.org/10.1016/0257-8972(87)90105-8" @default.
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