Deformation behavior and mechanical properties of polycrystalline and single crystal alumina during nanoindentation
MetadataShow full item record
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
Showing items related by title, author, creator and subject.
Mechanical properties, stress distributions and nanoscale deformation mechanisms in single crystal 6H-SiC by nanoindentationNawaz, A.; Mao, W.; Lu, Chunsheng; Shen, Y. (2017)© 2017The nanoscale elastic-plastic deformation behavior of single crystal 6H-SiC was systematically investigated by using nanoindentation with a Berkovich indenter. The effect of loading rates on the critical pop-in load, ...
Nawaz, A.; Mao, W.; Lu, Chunsheng; Shen, Y. (2017)The nanoscale elastic-plastic response of single crystal 4H-SiC has been investigated by nanoindentationwith a Berkovich tip. The hardness (H) and elastic modulus (E) determined in the load-independent region were 36±2 ...
Nanoscale elastic-plastic deformation and stress distributions on the C plane of sapphire single crystal during nanoindentationMao, W.; Shen, Y.; Lu, Chungsheng (2011)The nanoscale elastic-plastic characteristics of the C plane of sapphire single crystal were studied by ultra-low nanoindentation loads with a Berkovich indenter within the indentation depth less than 60 nm. The smaller ...