Microstructural Design for Improved Mechanical Behaviour of Advanced Materials
J. Phys. IV France 10 (2000) Pr6-157-Pr6-162
Grain boundary-related high temperature plasticity in oxide ceramics : The effect of cation dopingT. Sakuma
Department of Materials Science, The Universify of Tokyo, Bunkyo-ku Hongo 7-3-1, Tokyo 113-8656, Japan
High-temperature plastic flow in oxide ceramics is controlled by grain boundary diffusion of the constituent ions in a fairly wide temperature and strain rate region. In such deformation conditions, the plastic flow is very sensitive to the grain boundary segregation of a dopant cation. Two typical examples of the dopant effect, high-temperature creep resistance in high-purity, polycrystalline Al2O3 and tensile ductility in SiO2-doped tetragonal zirconia polycrystal are briefly introduced in this paper.
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