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

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

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


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 languageEnglish
Pages (from-to)1063-1065
Number of pages3
JournalApplied Physics Letters
Issue number8
Publication statusPublished - 1996

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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