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Low‐Temperature Creep of Nanocrystalline Titanium(IV) Oxide
Author(s) -
Hahn Horst,
Averback Robert S.
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb06863.x
Subject(s) - creep , materials science , nanocrystalline material , grain size , atmospheric temperature range , deformation (meteorology) , strain rate , composite material , deformation mechanism , rutile , diffusion creep , stress (linguistics) , metallurgy , titanium , oxide , grain boundary , microstructure , thermodynamics , nanotechnology , chemical engineering , linguistics , physics , philosophy , engineering
Nanocrystalline TiO 2 with densities higher than 99% of rutile has been deformed in compression without fracture at temperatures between 600° and 800°C. The total strains exceed 0.6 at strain rates as high as 10 −3 s −1 . The original average grain size of 40 nm increases during the creep deformation to final values in the range of 120 to 1000 nm depending on the temperature and total deformation. The stress exponent of the strain rate, n , is approximately 3 and the grain size dependence is d − q with q in the range of 1 to 1.5. It is concluded that the creep deformation occurs by an interface reaction controlled mechanism.