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- Title
Plastic yielding of glass in high‐pressure torsion apparatus.
- Authors
Ding, Linfeng; Kerber, Michael; Kunisch, Clemens; Kaus, Boris J. P.
- Abstract
Hardness measurements performed at room temperature have demonstrated that glass can flow under elevated pressure, whereas the effect of high pressure on glass rheology remains poorly quantitated. Here, we applied a high‐pressure torsion apparatus to deform SCHOTT SF6® glass and attempted to quantitate the effect of pressure and temperature on the shear deformation of glass subjected to pressures from 0.3 to 7 GPa and temperatures from 25 to 496°C. Results show that the plastic yield deformation was occurring during the HPT experiments on the SF6 glass at elevated temperature from 350 to 496°C. The yield stress of SF6 glass decreases with increasing temperature and decreasing pressure. An extended Arrhenius model with one set of parameters, namely infinite yield stress Y0 = 0.17 ± 0.1 GPa, activation energy Ea = 4.8 ± 0.5 kJ/mol and activation volume Va = 1.4 ± 0.2 cm3/mol, can explain the experimental results well.
- Subjects
GLASS transitions; GLASS melting; PHASE transitions; TORSION; TORSIONAL load
- Publication
International Journal of Applied Glass Science, 2019, Vol 10, Issue 1, p17
- ISSN
2041-1286
- Publication type
Article
- DOI
10.1111/ijag.12847