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Plastic yielding of glass in high‐pressure torsion apparatus
Author(s) -
Ding Linfeng,
Kerber Michael,
Kunisch Clemens,
Kaus Boris J. P.
Publication year - 2019
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.12847
Subject(s) - activation energy , materials science , arrhenius equation , torsion (gastropod) , composite material , rheology , yield (engineering) , glass transition , high pressure , volume (thermodynamics) , thermodynamics , chemistry , polymer , medicine , surgery , physics
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 Y 0 = 0.17 ± 0.1 GPa, activation energy E a = 4.8 ± 0.5 kJ/mol and activation volume V a = 1.4 ± 0.2 cm 3 /mol, can explain the experimental results well.