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Temperature dependence of shear transformation zone volume and plasticity in bulk metallic glass.
- Source :
-
Journal of Non-Crystalline Solids . Feb2023, Vol. 601, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- • Positive temperature dependence of STZ volume and activation energy is formulated based on physical model. • Negative temperature dependence of shear band density and significant improvement of plasticity at lower temperature is demonstrated. • Experimental results of plasticity fit well with the prediction of the analytical formulation. In this paper, a theoretical formulation for shear transformation zone (STZ) volume, shear band density, and plasticity are presented and temperature dependence of these parameters are discussed. In particular, the strain energy barrier for a shear cooperative transformation is modeled following the Johnson and Samwer approach for amorphous metallic glasses; positive temperature dependence of the STZ volume and negative temperature dependence of the shear band density are formulated, based on which a significant improvement in plasticity at lower temperatures is predicted. Experimental data on the plasticity for Vit105 bulk metallic glass - obtained from the present compression tests and also from the literature - show negative temperature dependence, which is consistent with the prediction of the analytical formulation. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ACTIVATION energy
*LOW temperatures
*STRAIN energy
*TEMPERATURE
*METALLIC glasses
Subjects
Details
- Language :
- English
- ISSN :
- 00223093
- Volume :
- 601
- Database :
- Academic Search Index
- Journal :
- Journal of Non-Crystalline Solids
- Publication Type :
- Academic Journal
- Accession number :
- 160909535
- Full Text :
- https://doi.org/10.1016/j.jnoncrysol.2022.122048