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

Kaveh Edalati; Ikuro Fujita; Xavier Sauvage; Makoto Arita; Zenji Horita

doi:10.1016/j.jallcom.2018.11.086

Journal articles

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

Kaveh Edalati ^{1, 2} Ikuro Fujita ^{1, 2} Xavier Sauvage ³ Makoto Arita ² Zenji Horita ^{4, 1}

1 WPI-I2CNER - International Institute for Carbon-Neutral Energy Research

2 DMS - Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka

3 GPM - Groupe de physique des matériaux

4 Department of Material Science and Engineering [Fukuoka]

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.

Keywords : Severe plastic deformation (SPD) Vanadium dioxide (VO2) SiO2 glass Phase transition Ultrafine-grained (UFG) Ceramics Nanostructured oxides

Document type :

Journal articles

Domain :

Physics [physics] / Condensed Matter [cond-mat] / Materials Science [cond-mat.mtrl-sci]

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https://hal-normandie-univ.archives-ouvertes.fr/hal-02142192
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Submitted on : Tuesday, May 28, 2019 - 2:40:31 PM
Last modification on : Wednesday, November 3, 2021 - 3:59:25 AM

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

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

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