Temperature Failure Mechanisms in Ceramics 12. PERSONAL AUTHORS) (unc'l assi fi ed7)

19. A STRACT iConsinjue on reverse it neceuar.nd identity by block numberl This report summarizes the results of a fundamental study involving experimental characterization and analytical modeling of grain boundary cavitation and creep crack growth in structural ceramics exposed to pure tensile loading. The major experimental techniques employed in the program are the use of small-angle neutron scattering to characterize cavity nucleation and growth and stereoimaging analysis to characterize the stress and strain fields associated with growing creep cracks. In the first section of the report, the experimental progress is summarized. Th