Plastic anisotropy and the role of non-basal slip in magnesium alloy AZ31B |
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| Institution: | 1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China;2. The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China;3. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA;4. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China;1. Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, 2266-98 Anagahora, Shimo-shidami, Moriyama, Nagoya 463-8560, Japan;2. Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Yoshidahonmachi, Sakyo, Kyoto 606-8501, Japan;1. Department of Material Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;2. Energy Components and Materials R&BD Group, Korea Institute of Industrial Technology (KITECH), Busan 618-230, Republic of Korea;3. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;1. IMDEA Materials Institute, C/ Eric Kandel 2, 28906 Getafe, Madrid, Spain;2. Department of Materials Science, Polytechnic University of Madrid, 28040 Madrid, Spain;3. Magnesium Innovation Centre MagIC, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany;4. Max Planck Institute for Iron Research, Max Planck St., 1, 40237 Düsseldorf, Germany;1. Department of Mechanical Engineering, University of Maryland, Baltimore County, Baltimore, MD 21250, USA;2. NIST Center for Neutron Research, Gaithersburg, MD 20899-8562, USA |
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| Abstract: | Mechanistic explanations for the plastic behavior of a wrought magnesium alloy are developed using a combination of experimental and simulation techniques. Parameters affecting the practical sheet formability, such as strain hardening rate, strain rate sensitivity, the degree of anisotropy, and the stresses and strains at fracture, are examined systematically by conducting tensile tests of variously oriented samples at a range of temperatures (room temperature to 250 °C) and strain rates (10−5–0.1 s−1). Polycrystal plasticity simulations are used to model the observed anisotropy and texture evolution. Strong in-plane anisotropy observed at low temperatures is attributed to the initial texture and the greater than anticipated non-basal cross-slip of dislocations with 〈a〉 type Burgers vectors. The agreement between the measured and simulated anisotropy and texture is further validated by direct observations of the dislocation microstructures using transmission electron microscopy. The increase in the ductility with temperature is accompanied by a decrease in the flow stress, an increase in the strain rate sensitivity, and a decrease in the normal anisotropy. Polycrystal simulations indicate that an increased activity of non-basal, 〈c + a〉, dislocations provides a self-consistent explanation for the observed changes in the anisotropy with increasing temperature. |
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