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Titanium diboride (TiB 2 ) is regarded as the most promising material to be used as inert cathodes in the electrochemical reduction of alumina to aluminium metal. TiB 2 is well known as a ceramic material with high strength and durability characterized by a high melting point, high hardness, and excellent mechanical and chemical wear resistances. However, one concern with this material is the variability of its properties, depending on the processing procedures and the obtained microstructure (e.g. bulk density, secondary phases, grain size). In this work, a multiscale framework is used to evaluate the degradation of the TiB 2 as a function of its microstructure. The mechanical and fracture parameters of TiB 2 and its secondary phases were determined by the density functional theory and were implemented in a crystal elasticity-finite elements model. The influence of TiB 2 grain size and the properties of the secondary phase on the mechanical properties and degradation mechanisms were predicted and discussed regarding the effects of material parameters identified at different scales.

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