An experimental and numerical study on the formability of textured AlZnMg alloys |
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| Institution: | 1. SINTEF Materials and Chemistry, Trondheim, Norway;2. Hydro Aluminium Metal Products, Sunndalsøra, Norway;3. Structural Impact Laboratory (SIMLab), Centre for Research-based Innovation, Department of Structural Engineering, NTNU, Trondheim, Norway;1. Christian-Doppler-Laboratory of Material Mechanics of High Performance Alloys, Institute of Materials Science and Mechanics of Materials, Technische Universität München, Boltzmannstraße 15, 85748 Garching, Germany;2. Institute of Materials Science and Mechanics of Materials, Technische Universität München, Boltzmannstraße 15, 85748 Garching, Germany;1. Gent University, Department of Materials Science and Engineering, Technologiepark 903, B-9052 Gent, Belgium;2. Catholic University of Leuven, Faculty of Engineering, Department of Metallurgy and Materials Engineering, 3001 Heverlee (Leuven), Belgium;3. Delft University of Technologies, Department of 3ME, Mekelweg 2, 2600 GA Delft, The Netherlands;1. Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 90762, Fürth, Germany;2. School of Materials Science and Engineering, Central South University, Changsha 410083, China;3. School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China;4. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan 411105, China;1. Department of Chemical Engineering and Materials Science, University of California Davis, One Shields Avenue, Davis, CA 95616, USA;2. Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3109, USA;3. Northwestern University Center for Atom Probe Tomography (NUCAPT), 2220 Campus Drive, Evanston, IL 60208-3109, USA |
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| Abstract: | The influence of texture and grain structure on strain localisation and formability is investigated experimentally and numerically for two AlZnMg alloys. The considered alloys have recrystallised or non-recrystallised grain structure and strong or nearly random texture. The textured materials have rotated cube texture or β-fibre texture of high intensity. A comprehensive test programme, including uniaxial tension tests in three directions, through-thickness compression tests, plane-strain tension tests and double-plate formability tests, is completed to determine the work hardening, plastic anisotropy and formability of the materials. Strain localisation and failure are examined by optical microscopy. Using parts of the test data, an anisotropic plasticity model is calibrated and applied in calculation of forming limit curves, using the Marciniak–Kuczynski (M-K) analysis for anisotropic materials. The formability tests show that the materials with nearly random texture exhibit superior formability. This is mainly attributed to enhanced work hardening for these materials. For the material exhibiting strong β-fibre texture significantly lower formability is found in equibiaxial stretching than in plane strain, while this characteristic is not seen for the material with strong cube texture. The M-K analysis is capable of predicting the major trends of the experiments, and captures the low formability of the alloy with strong β-fibre texture under equibiaxial straining. A numerical study is performed to evaluate the sensitivity of the predicted forming limit curves to parameters not determined experimentally. |
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