NDLI: Compressive creep behavior in air of a slightly porous as-sintered polycrystalline α-alumina material

Content Provider	Springer Nature Link
Author	Bernard Granger, Guillaume Guizard, Christian Duclos, Richard
Copyright Year	2007
Abstract	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 Al$^{3+}$ 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 Al$^{3+}$ 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.
Starting Page	2807
Ending Page	2819
Page Count	13
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	42
Issue Number	8
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-01-13
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics Crystallography Continuum Mechanics and Mechanics of Materials Polymer Sciences Characterization and Evaluation of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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