Fracture Properties of Polycrystalline Lithia-Stabilized β“- Alumina

摘要: The critical stress-intensity factor, K1C, and the fracture strength, σf, have been investigated on both hot-pressed sintered lithia-stabilized β”-alumina. material possessed a strong preferred orientation with many of basal planes aligned perpendicular to direction hot-pressing. Both K1C σf were found be orientation-dependent. Two regimes identified. In fine-grained (<120 μm), strength was slightly dependent grain size. For larger sizes, decreased rapidly increasing size mode almost entirely transgranular. values for β”-alumina in same range as those obtained material.