High temperature plastic deformation of multilayered YTZP/ZTA composites obtained by TAPE casting

摘要

Laminar composites containing layers of 3 mol/100 yttria-stabilized tetragonal ZrO_2(YTZP) and a mixture of Al_2O_3/3YTZP (60/40 vol./100) have been fabricated via a tape casting process that allowed for- mation of multilayers with strong and sharp interfaces. Compressive tests at constant strain rate and con- stant load were carried out on these materials in air at temperatures between 1200 and 1400 deg.c with the stress axis both parallel and perpendicular to the layer interfaces. Microstructural observation of strained composites indicated that deformation is achieved primarily by grain boundary sliding.