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dislocation-density-model
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Flow stress evolution in further straining of severely deformed Al
, Article Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science ; Volume 50, Issue 5 , 2019 , Pages 2371-2380 ; 10735623 (ISSN) ; Kazeminezhad, M ; Sharif University of Technology
Springer Boston
2019
Abstract
To investigate the flow stress evolution in further straining of severely deformed Al sheets, a comprehensive model which considers both mechanical and metallurgical alterations is needed. In this study, constrained groove pressing (CGP) as a severe plastic deformation method, and a flat rolling process for further straining are utilized. Using basic mechanical models, strain and strain rate were calculated for this process. Dislocation density and flow stress evolutions were predicted by utilizing initial mechanical data, considering the ETMB (Y. Estrin, L. S. Toth, A. Molinari, and Y. Brechet) dislocation density model. Based on these model predictions, the combination of the CGP process...
Deformation behavior of 6061 aluminum alloy through tube channel pressing: Severe plastic deformation
, Article Journal of Materials Engineering and Performance ; Volume 21, Issue 10 , 2012 , Pages 2099-2105 ; 10599495 (ISSN) ; Kazeminezhad, M ; Sharif University of Technology
Springer
2012
Abstract
The deformation behavior of solid solution-treated AA6061 tubes in a novel severe plastic deformation process named Tube Channel Pressing has been assessed. In order to do so, an analysis based on the finite element method and dislocation density model is utilized, and microhardness measurement is carried out to verify the trends of analysis results. By comparing FEM results with experimental data, the optimized geometrical parameters controlling the deformation behavior of the tube in tube channel pressing are determined to obtain the best strain homogeneity and minimum dimensional changes in tube