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Recently, authors have proposed a unique "non-firing sintering" method for solidifying various ceramics without applying an external pressure and/or temperature.Surface activation of powders by ball milling plays an important role in this method, however many aspects of this method regarding its mechanism is not well understood. Since there are many similarities between ball milling and high-pressure torsion (HPT) method in terms of inducing strain to the surface of powder, in this review some well-known metal oxides like titania (TiO₂), zirconia (ZnO), and yttria (Y₂O₃) have been subjected to the severe plastic deformation, and effect of plastic strain on the phase transformations of them is investigated. In addition, the optical/photocatalyic properties of HPT processed samples is also investigated.
Effect of High Pressure and Plastic Strain on Optical Properties of TiO₂, ZnO, and Y₂O₃
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