Composite materials toughened with t-ZrO₂ are used in the mechanical engineering because its fracture behaviour may control by structural transformation. In this work was studied the behaviour of some materials, with tialite and zirconium oxide in correlation with thermal phases diagram of quaternary CeO₂-ZrO₂-Al₂O₃-TiO₂ system. In this paper was showed that may obtain the composite materials constituted by Al₂TiO₅ and t-ZrO₂ at the relative low temperatures. By the reaction between zirconium titanate and corundum and t-ZrO₂ and Al₂O₃ forms the tialite, a compound that assure to samples a good resistance at thermal shock.