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From Niihara's Equation to Peculiar Nanoindentation Deformation of Ceramics and Semiconductors

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Abstract:

The present paper is based on the contribution by Niihara and his co-workers devoted to indentation testing of ceramic materials, while it provides new observations of peculiarities registered during nanoindentation of sapphire, GaAs and InGaNAs deposited by MBE-technique. Exploiting previous studies of the spherical indentation in sapphire, the present authors recognized different causes that result in the apparently similar pop-in phenomenon for sapphire and GaAs-based semiconductors. The finite element modeling of the quasi-plastic nanoindentation of the ( 1 1 20) plane of sapphire with the elastically deformable tip confirmed that the deformation of sapphire is governed by twinning which causes pop-in phenomenon, as suggested earlier by Niihara et al. The singularities registered for GaAs-based crystals are associated with dislocation movement within {111} slip bands, which is in contrast to the case of sapphire.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

293-296

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.293

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Online since:

August 2006

Authors:

Roman Nowak, Ari T. Hirvonen, Tohru Sekino

Keywords:

Twinning, Computer Modeling, Contact Problem, Nanoindentation, Sapphire

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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