caa a22 4500 463230833 CHVBK 20180405153241.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10853-006-1379-7 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1379-7 Compressive creep behavior in air of a slightly porous as-sintered polycrystalline α-alumina material [Elektronische Daten] [Guillaume Bernard-Granger, Christian Guizard, Richard Duclos] Compressive creep tests in air have been performed on a polycrystalline submicron as sintered and slightly porous α-alumina material. Two different deformation mechanisms, depending on the applied stress and creep temperature, have been identified when the grain size becomes higher than a critical value 〈G *〉. For low temperatures and/or low applied stresses, deformation occurs by grain boundary sliding accommodated by an in-series "interface reaction/diffusion of Al3+ cations” process, with the limiting step being the interface reaction. In this case increased densification of the samples is observed after creep, compared to the as-sintered ones. In contrast, for high temperatures and/or high-applied stresses, deformation occurs by grain boundary sliding accommodated by the relocation and growth of preexisting cavities, the growth step being also controlled by the diffusion of Al3+ cations. In this case, a marked decrease of the relative density is measured on the crept samples compared to the as-sintered ones. Using these results, it is possible to identify the optimal conditions for superplastic forming of previously as-sintered parts, leading to shaped objects with an increased final density. Springer Science+Business Media, LLC, 2007 Bernard-Granger Guillaume Laboratoire de Synthèse et Fonctionnalisation des Céramiques, FRE 2770 CNRS/Saint-Gobain, Saint-Gobain C.R.E.E., 84306, Cavaillon Cedex, France aut Guizard Christian Laboratoire de Synthèse et Fonctionnalisation des Céramiques, FRE 2770 CNRS/Saint-Gobain, Saint-Gobain C.R.E.E., 84306, Cavaillon Cedex, France aut Duclos Richard Laboratoire de Structure et Propriétés de l'Etat Solide, UMR CNRS 8008, Université des Sciences et Technologies de Lille, 59655, Villeneuve d'Ascq Cedex, France aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/8(2007-04-01), 2807-2819 0022-2461 42:8<2807 2007 42 10853 https://doi.org/10.1007/s10853-006-1379-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1379-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bernard-Granger Guillaume Laboratoire de Synthèse et Fonctionnalisation des Céramiques, FRE 2770 CNRS/Saint-Gobain, Saint-Gobain C.R.E.E., 84306, Cavaillon Cedex, France aut NATIONALLICENCE 700 1- Guizard Christian Laboratoire de Synthèse et Fonctionnalisation des Céramiques, FRE 2770 CNRS/Saint-Gobain, Saint-Gobain C.R.E.E., 84306, Cavaillon Cedex, France aut NATIONALLICENCE 700 1- Duclos Richard Laboratoire de Structure et Propriétés de l'Etat Solide, UMR CNRS 8008, Université des Sciences et Technologies de Lille, 59655, Villeneuve d'Ascq Cedex, France aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/8(2007-04-01), 2807-2819 0022-2461 42:8<2807 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer