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Front Cover (Phys. Status Solidi A 11/2010)
Author(s) -
Mazaheri Mehdi,
Mari Daniele,
Schaller Robert
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201090023
Subject(s) - front cover , grain boundary , creep , grain boundary sliding , materials science , deformation (meteorology) , boundary (topology) , cover (algebra) , condensed matter physics , composite material , microstructure , physics , mathematics , mathematical analysis , mechanical engineering , engineering
The high temperature deformation of zirconia is mainly controlled by grain boundary sliding (GBS). Mechanical spectroscopy that measures the phase lag tan(ϕ) 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 .