Microstructure and phase transformations of silica glass and vanadium oxide by severe plastic deformation via high-pressure torsion straining

Abstract : Plastic deformation of oxides is generally difficult due to their hard and brittle nature resulting from their covalent or ionic bondings. In this study, severe plastic deformation was successfully introduced in SiO2 glass and crystalline VO2 by high-pressure torsion (HPT). SiO2 glass transformed to a denser amorphous phase without showing any crystallization after processing in the temperature range of 300–723 K. Crystalline VO2 transformed from the coarse-grained monoclinic phase to a nanograined triclinic phase with insulating electrical properties by plastic strain effect. These findings indicate the potential of HPT process in tuning the crystal structure of optical and electrical oxides.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02142192
Contributeur : Xavier Sauvage <>
Soumis le : mardi 28 mai 2019 - 14:40:31
Dernière modification le : vendredi 9 août 2019 - 14:10:05

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Kaveh Edalati, Ikuro Fujita, Xavier Sauvage, Makoto Arita, Zenji Horita. Microstructure and phase transformations of silica glass and vanadium oxide by severe plastic deformation via high-pressure torsion straining. Journal of Alloys and Compounds, Elsevier, 2019, 779, pp.394-398. ⟨10.1016/j.jallcom.2018.11.086⟩. ⟨hal-02142192⟩

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