Activation Energy of Shear Transformation Zones: A Key for Understanding Rheology of Glasses and Liquids
- 6 November 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 97 (19), 195501
- https://doi.org/10.1103/physrevlett.97.195501
Abstract
Key manifestations of the glassy and liquid states, such as viscous flow and structural relaxation, occur spatial and temporal heterogeneously, within highly localized rare events, termed shear transformation zones. Characterization of these basic entities with respect to thermal activation and mechanical response is vital for understanding the rheology of glasses across length scales. This is achieved in classical molecular dynamics computer simulations on the model glass, CuTi, by determining the activation energy barrier and plastic yield strain of individual shear transformation zones as a function of size and external stress loading. Sizes of are identified to be especially energetically favorable with an activation energy barrier of . Using these parameters, a rheology model is proposed to quantitatively explain viscosity.
Keywords
This publication has 24 references indexed in Scilit:
- Glassy Materials and Disordered SolidsPublished by World Scientific Pub Co Pte Ltd ,2005
- The kinetics of internal structural relaxation of metallic glasses probed with ion beams and resistivity measurementsJournal of Applied Physics, 2005
- Supercooled liquids and the glass transitionNature, 2001
- The shear modulus of bulk amorphous Pd40Ni40P20 and its relation to viscosity and specific heatJournal of Alloys and Compounds, 2000
- Glassy dynamicsContemporary Physics, 2000
- Heterogeneity at the glass transition: a reviewJournal of Non-Crystalline Solids, 1999
- Supercooled Liquids and GlassesThe Journal of Physical Chemistry, 1996
- Through the Glass LightlyScience, 1995
- Structural instability and relaxation in liquid and glassy phases near the fragile liquid limitJournal of Non-Crystalline Solids, 1988
- Thermodynamics of Crystals and MeltingThe Journal of Chemical Physics, 1939