Shear transformation zone dynamics model for metallic glasses incorporating free volume as a state variable
By Lin Li, E. Homer, C. A. Schuh. 2013
152 citations recorded by the source corpus.
Abstract A mesoscale model, shear transformation zone dynamics (STZ dynamics), is employed to investigate the connections between the structure and deformation of metallic glasses. The present STZ dynamics model is adapted to incorporate a structure-related state variable, and evolves via two competing processes: STZ activation, which creates free volume, vs. diffusive rearrangement, which annihilates it. The dynamical competition between these two processes gives rise to an equilibrium excess free volume that can be connected to flow viscosity via the phenomenological Vogel–Fulcher–Tammann relation in relaxed structures near the glass transition temperature. On the other hand, the excess free volume allows glasses to deform at low temperatures via shear localization into shear bands, even in the presence of internal stress distributions that arise upon cooling after processing.
Subfields: Ceramics and Composites, Materials Chemistry, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/2e6753d465f0506abf91565341d8b6e47770df5f
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In Ceramics and Composites
In Materials Chemistry
In Mechanical Engineering
Citations in the corpus
- Deformation and flow of amorphous solids: Insights from elastoplastic models (2017, methodology): “Several EPM have been able to reproduce permanent strain localization (Bulatov and Argon, 1994b; Coussot and Ovarlez, 2010; Jagla, 2007; Li et al., 2013; Martens et al., 2012; Nicolas et al., 2014b; Vandembroucq and Roux, 2011).”