Effect of temperature on toughness curves in alumina

Journal Article · Sat Dec 31 23:00:00 EST 1994 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08399.x· OSTI ID:182674

Xu, H H.K.; Ostertag, C P; Krause, Jr, R F ^[1]

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1. National Inst. of Standards and Technology, Gaithersburg, MD (United States). Ceramics Div.

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 1,300 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.

• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 182674
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
ANNEALING
BENDING
BULK DENSITY
CRACKS
FRACTURE MECHANICS
FRACTURE PROPERTIES
GRAIN SIZE
MATHEMATICAL MODELS
OPTICAL MICROSCOPY
RESIDUAL STRESSES
SAMPLE PREPARATION
TEMPERATURE DEPENDENCE