Crack deflection processes-II. Experiment 

 -  Acta Metallurgica, 31(4), p.577-584, 1983 .
<br/><br/> o microstructural characteristics, particle morphology and size, have been examined with respect to toughening by crack deflection. Particle morphology effects were evaluated in a series of hot-pressed silicon nitrides comprised of rod-shaped grains of various aspect ratios and a barium- silicate glass ceramic containing spherulites. Lithium-alumina-silicate glass ceramics containing Li2Si10s lath-shaped crystals were studied for particle size effects. Independent measures of the fracture toughness and the crack deflection process were performed and results were correlated with a crack deflection model.