Microstructure and creep properties of alumina.

Journal Article · Sun Jan 01 04:00:00 EST 1995 · J. Eur. Ceram. Soc.

DOI:https://doi.org/10.1016/0955-2219(95)00070-B· OSTI ID:937716

Moreno, J M. C.; Lopez, A R; Rodriguez, A D; Routbort, J L

High temperature creep of two zirconia toughened alumina ceramics, fabricated by powder processing and sol-gel precursors processing, has been studied in order to determine plastic deformation mechanisms. Compressive creep tests were carried out between 1300 and 1450 C, under stresses from 10 to 150 MPa. For the sample fabricated from powders, a stress exponent of 1.4 and an activation energy of 580 kJ/mol were found below a critical stress of 40 MPa. For larger stresses, accelerated creep rates developed. In the specimens processed from precursors, values of 1.8 for the stress exponent and 540 kJ/mol for the activation energy, over the entire range of stresses have been determined. Creep parameters and microstructural evolution of the samples during the experiments have been correlated with models to establish the dominant creep mechanism.

• Research Organization: Argonne National Laboratory (ANL)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 937716
• Report Number(s): ANL/ET/JA-14450
• Journal Information: J. Eur. Ceram. Soc., Journal Name: J. Eur. Ceram. Soc. Journal Issue: 10 ; 1995 Vol. 15; ISSN 0955-2219; ISSN JECSER
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
ALUMINIUM OXIDES
CREEP
MICROSTRUCTURE
STRESSES
ZIRCONIUM OXIDES