Deformation of sapphire induced by a spherical indentation on the (101̄0) plane

R. Nowak; T. Sekino; S. Maruno; K. Niihara

Deformation of sapphire induced by a spherical indentation on the (101̄0) plane

R. Nowak, T. Sekino, S. Maruno, K. Niihara

Institute of Multidisciplinary Research for Advanced Materials (IMRAM)

Research output: Contribution to journal › Article › peer-review

Abstract

This work clarifies the origin of the characteristic discontinuities registered during the deformation of the (101̄0) plane of sapphire, by means of depth sensing indentation experiments with a spherical indenter. The sudden increase of the plasticity of the crystal was found to be caused by a twinning process. The calculation and analysis of the distribution of resolved shear stresses under a spherical indenter predicted the features of the surface deformation. The high resolution microscopic examination of the residual impressions confirmed the theoretical prediction.

Original language	English
Number of pages	1
Journal	Applied Physics Letters
Publication status	Published - 1995 Dec 1

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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AB - This work clarifies the origin of the characteristic discontinuities registered during the deformation of the (101̄0) plane of sapphire, by means of depth sensing indentation experiments with a spherical indenter. The sudden increase of the plasticity of the crystal was found to be caused by a twinning process. The calculation and analysis of the distribution of resolved shear stresses under a spherical indenter predicted the features of the surface deformation. The high resolution microscopic examination of the residual impressions confirmed the theoretical prediction.

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