THE EFFECTS OF ANODIC OXIDE FILMS ON THE MECHANICAL PROPERTIES OF ALUMINUM SINGLE CRYSTALS

摘要

The fracture strain of the anodic coatings formed on aluminum single and polycrystalline specimens was found to decrease as the thickness of the film was increased. Stress analysis applied to the coating crystal system indicated that the coatings were under the influence of a system of biaxial street. Thus, the magnitude of the coating fracture strains obtained in the present work was less than the fracture strain values reported for isolated anodic films of the same thickness.nCoatings thicker than 1350 A accommodated substrate strain by detachment at the slip steps and fracturing transverse to the tensile axis. The angle between the transverse cracks and the tensile axis of the single crystal specimen could be predicted from the specimen geometry and the orientation of the single crystal.