Influences of tensile pre-strain and bending pre-deflection on bending and tensile behaviors of an extruded AZ31B magnesium alloy |
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| Affiliation: | 1. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;2. Shanxi Research Center of Advanced Materials Science and Technology, Taiyuan 030024, China;3. Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway;4. Center for Advanced Materials, Qatar University, P.O. Box 2713 Doha, Qatar;5. Department of Engineering, University of Leicester, Leicester LE1 7RH, UK;1. School of Mechanical Science and Engineering, Jilin University, Changchun 130025, China;2. Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025, China;1. Northwestern University, Evanston, IL, U.S.A.;2. Shanghai Jiao Tong University, Shanghai, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;2. Department of Mechanical Engineering, Politecnico di Milano, 20156 Milan, Italy;3. Chongqing Research Center for Advanced Materials, Chongqing Academy of Science & Technology, Chongqing 401123, China;1. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;2. Shanxi Research Center of Advanced Materials Science and Technology, Taiyuan 030024, China;3. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;4. Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway;5. Center for Advanced Materials, Qatar University, POB 2713 Doha, Qatar;6. Department of Engineering, University of Leicester, Leicester LE1 7RH, UK |
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| Abstract: | This paper focused on the influences of tensile pre-strain and bending pre-deflection on the three point bending and uniaxial tensile properties of an extruded AZ31B magnesium alloy. The influences of pre-strain/deflection on bending/tensile curves could be divided into three stages. The results show that: (1) In the elastic stage, considering the variation of specimen’s cross sectional area, the pre-strain/deflection did not affect the measured elastic modulus obtained from both bending and tensile tests. (2) In the transition hardening stage, the specimen presented obvious hardening behaviors on basis of the pre-strain/deflection, the phenomenon was mainly caused by the strain hardening effects produced from previous uniaxial tensile and bending processes. (3) In the large plastic deformation stage/necking stage, as the accumulation of plastic deformations caused by pre-strain/deflection were significant, the specimen’s ability to resist plastic deformation was weakened. Specially, as the tensile pre-strain increased, the bending load decrement rate gradually decreased, and as the bending pre-deflection increased, both the tensile strength and elongation sharply decreased, the accumulated irreversible plastic work promoted the damage process of the magnesium alloy. The influences of tensile pre-strain on the bending behaviors of the magnesium alloy were also analyzed via finite element method. |
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| Keywords: | Magnesium alloy Plastic deformation Bending Tensile Strain hardening |
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