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Two-internal variable thermodynamics modelling of severe plastic deformation: Dislocation and flow stress evolutions

Parvin, H ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1179/1743284715Y.0000000009
  3. Publisher: Maney Publishing , 2015
  4. Abstract:
  5. Two-internal variable thermodynamics model is presented to investigate the evolution of microstructure and flow stress during severe plastic deformation. Previous studies have shown that due to heterogeneous distribution of dislocations during severe plastic deformation, the use of multivariable models is needed. In this regard, a two-internal variable model is presented. In the present paper, the dislocation densities in the subgrain boundaries and interiors are considered as internal variables. The model uses general laws of thermodynamics and describes the evolution of the dislocation densities on the basis of parameters such as the self-diffusion activation energy and the stacking fault energy. The model predicts the dislocation density, subgrain size and strength. To verify the model, the achieved results are compared with the experimental data
  6. Keywords:
  7. Model ; Activation energy ; Microstructural evolution ; Plastic deformation ; Plastic flow ; Thermodynamics ; Dislocation densities ; Heterogeneous distributions ; Multi-variable models ; Self-diffusion activation energy ; Severe plastic deformations ; Stacking fault energies ; Subgrain boundaries ; Thermodynamics model ; Multivariable systems
  8. Source: Materials Science and Technology (United Kingdom) ; Volume 31, Issue 14 , Jan , 2015 , Pages 1788-1793 ; 02670836 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1179/1743284715Y.0000000009