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Overview no. 48

descriptionPublicationkeyboard_double_arrow_right Article 01 May 1986 English Publisher:Elsevier BVJournal:Acta Metallurgica, volume 34, pages 761-800 (issn: 0001-6160,

Authors: Evans, A. G.; Cannon, R. M.;

doi: 10.1016/0001-6160(86)90052-0

Overview no. 48

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Abstract

Abstract A comprehensive review of toughening mechanisms in transformable brittle solids is presented. Primary emphasis is given to transformation toughening, although microcrack and deflection toughening are also considered. Models of toughness are developed using concepts from applied mechanics, but within the context of the thermodynamics and kinetics of the transformation process. The predictions of the models are compared with experimental data for various ZrO2 containing ceramic alloys. It is concluded that the predominant toughening mechanism depends on the alloy composition and microstructure; dilatational transformation toughening with shear modifications dominates in partially stabilized zirconia; uniaxial transformation and microcrack mechanisms prevail in zirconia toughened alumina; transformation toughening with partial reversibility predominates in tetragonal zirconia polycrystals.

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University of California, Berkeley
United States

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