physica status solidi (a)
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Editor: Stefan Hildebrandt (Editor-in-Chief), Sabine Bahrs (Deputy Editor)
Online ISSN: 1862-6319
Front Cover (Phys. Status Solidi A 11/2010)
The high temperature deformation of zirconia is mainly controlled by grain boundary sliding (GBS). Mechanical spectroscopy that measures the phase lag tan(&phis;) between a low stress periodic excitation and the strain response shows a mechanical loss spectrum consisting in a peak and a background as a function of frequency. The analysis of spectra taken at different temperatures leads to the construction of a master curve from which the kinetics of grain growth can be calculated. The activation energy is the same as for GBS. Inclusions of carbon nanotubes form additional pinning points that limit grain boundary sliding and decrease the creep rate. For more details see the article by Mazaheri et al. on pp. 2456–2460.