Stoichiometry Effects on the Fracture of TiO2−x |
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| Authors: | W P MINNEAR R C BRADT |
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| Affiliation: | Department of Materials Science and Engineering, College of Earth and Mineral Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802 |
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| Abstract: | Fracture characteristics of TiO2? x were studied as a function of Stoichiometry. With increasing x , the fracture toughness K I e and the fracture surface energy γ f decrease and the amount of transgranular cleavage increases, corresponding to the increased concentration of planar defects within the grains. Increasing nonstoichiometry also shifted the ( K I- V ) diagram to lower K I values, commensurate with the KI e decrease. Water accelerated stress corrosion by promoting intergranular failure during subcritical crack growth. |
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