Paper Title:
From Niihara's Equation to Peculiar Nanoindentation Deformation of Ceramics and Semiconductors
  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.

  Info
Periodical
Key Engineering Materials (Volumes 317-318)
Edited by
T. Ohji, T. Sekino and K. Niihara
Pages
293-296
DOI
10.4028/www.scientific.net/KEM.317-318.293
Citation
R. Nowak, A. T. Hirvonen, T. Sekino, "From Niihara's Equation to Peculiar Nanoindentation Deformation of Ceramics and Semiconductors", Key Engineering Materials, Vols. 317-318, pp. 293-296, 2006
Online since
August 2006
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Price
$32.00
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