Deformation behavior and mechanical properties of polycrystalline and single crystal alumina during nanoindentation
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The nanoscale pop-in phenomena in polycrystalline alpha-Al2O3 and single crystal alpha-Al2O3(0001) were comparatively investigated by nanoindentation with Berkovich indenters. It was found that different radii and loading rates have significant effects on the pop-ins formation, stress distributions and dislocation nucleations. Using the Hertzian contact theory and energetic model approach, the pop-in observations and resolved shear stress analysis are consistent with the explanation that the first pop-in corresponds to the nucleation of homogeneous dislocations when the theoretical shear strenghth is exceeded.
NOTICE: this is the author’s version of a work that was accepted for publication in Scripta Materialia. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Scripta Materialia, Vol. 65, no. 2, 2011, http://dx.doi.org/10.1016/j.scriptamat.2011.03.022
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