GRAIN BOUNDARIES IN HIGH TEMPERATURE DEFORMATION OF YTTRIA AND MAGNESIA CO-DOPED ALUMINA

1 January 1990

journal article
Published by EDP Sciences in Le Journal de Physique Colloques

Vol. 51 (C1) , C1-985
https://doi.org/10.1051/jphyscol:19901153

Abstract

This is a first investigation on the role of yttrium in the ductility under high temperature deformation of fine-grained Mg-doped aluminas. The changes in the constitutive laws of compressive tests associated to the modifications of the microstructure are supported by the electron microscopy observations. The most important effect of yttria co-doping is an increase in the dislocation density both in the grains and in the grain boundaries ; these observations reveal the hardening role of this element in the accommodation processes of grain boundary dislocations. This role of yttrium in grain boundary dislocation creep is in good agreement with the observed decrease in the deformation rate

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