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Effect of Temperature on Toughness Curves in Alumina
Author(s) -
Xu Hockin H. K.,
Ostertag Claudia P.,
Krause Ralph F.
Publication year - 1995
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.1151-2916.1995.tb08399.x
Subject(s) - materials science , indentation , crystallite , composite material , fracture toughness , bridging (networking) , atmospheric temperature range , toughness , metallurgy , thermodynamics , computer network , physics , computer science
The effect of temperature on fracture strength and toughness curves ( T ‐curves) in the short‐crack region of a polycrystalline alumina was studied. The indentation‐strength technique was used to measure strength and T ‐curve behavior in the temperature range of 25° to 1300°C. Grain‐localized crack bridging resulted in improved flaw tolerance and rising T ‐curves in this alumina. Both strength and toughness were observed to decrease with increasing temperature. A theoretical grain‐bridging model was used to calculate the T ‐curves and fit to the experimental data. This allowed the evaluation of the temperature dependence of important bridging parameters.