A simple model for dislocation behavior,strain and strain rate hardening evolution in deforming aluminum alloys |
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| Institution: | 1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;2. CNRS, INRAE, Centrale Lille, UMR 8207, UMET - Unité Matériaux et Transformations, University of Lille, Lille F-59000, France;3. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;4. Spallation Neutron Source Science Center, Institute of High Energy Physics, Chinese Academy of Sciences, Dongguan 523803, China;5. SIMAP, Université Grenoble Alpes, Grenoble 38000, France;1. Luleå University of Technology, 971 87 Luleå, Sweden;2. AB Sandvik Coromant, Metal Cutting Modeling, 811 81 Sandviken, Sweden;1. Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, PR China;2. Guizhou Key Laboratory of Materials Structure and Strength, College of Materials and Metallurgy, Guizhou University, Guiyang 550025, PR China |
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| Abstract: | In this work, modeling of the stress–strain behavior is carried out using a simple dislocation model. This model uses three variables to characterize the dislocation population: The average forest and mobile dislocation densities, ρf and ρm, and the average dislocation mean free path L. However, it is shown that within reasonable assumptions, only two of these variables are independent. The mathematical form derived from this dislocation-based model was applied to experimental stress–strain data determined at room temperature for pure aluminum, 3003-O, 2008-T4, 6022-T4, 5182-O and 5032-T4 aluminum alloy sheets. The evolution of the state variables was calculated for these materials from a single stress–strain curve. The average dislocation mean free paths at a strain of 0.5 were compared with TEM observations of dislocation cell sizes or inter-dislocation spacing for specimens deformed equal biaxially with the hydraulic bulge test. A very good agreement was obtained between predictions and experiments. |
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