Overview 14 Creep fracture in ceramic polycrystals—I. creep cavitation effects in polycrystalline alumina

Journal Article · Tue Dec 01 04:00:00 EST 1981 · Acta Metallurgica

DOI:https://doi.org/10.1016/0001-6160(81)90027-4· OSTI ID:1077140

Porter, J. R.; Blumenthal, W.; Evans, A. G.

Fine grained polycrystalline alumina has been deformed in creep at high temperatures, to examine the evolution of cavities at grain boundaries. Cavities with equilibrium and crack-like morphologies have been observed, distributed non-uniformly throughout the material. The role of cavities during creep has been described. A transition from equilibrium to crack-like morphology has been observed and correlated with a model based on the influence of the surface to boundary diffusivity ratio and the local tensile stress. The contribution of cavitation to the creep rate and total creep strain has been analyzed and excluded as the principal cause of the observed non-linear creep rate.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Materials Sciences Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1077140
• Report Number(s): LBL-11560
• Journal Information: Acta Metallurgica, Journal Name: Acta Metallurgica Journal Issue: 12 Vol. 29; ISSN 0001-6160
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE