Ceramics are usually brittle materials, i.e. with very little deformation before fracture. Although ceramics are often used for their chemical inertia, high rigidity, and functional properties at high temperature, their use is largely limited due to their brittle behaviour, especially for structural applications . Alumina is one of the most commonly used technical ceramic in industrial applications. It can be reinforced with zirconia resulting in composites commonly called Zirconia-Toughened Alumina (ZTA) which are characterized by higher mechanical properties than conventional alumina . The use of a stabilizer, such as yttria, retains zirconia in the tetragonal phase after sintering at room temperature. Another way to stabilize zirconia is to use a narrow size distribution of zirconia particles dispersed in an alumina matrix , for example through a colloidal processing route . When a crack propagates in the material, the stress field at the crack tip causes a tetragonal to monoclinic phase transformation of the zirconia particles. The volume increase resulting from this phase transformation generates a compressive field around the crack tip, locally slowing down the crack propagation and macroscopically increasing the toughness of the material .