Experimental study on tensile property of AZ31B magnesium alloy at different high strain rates and temperatures |
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| Affiliation: | 1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;2. School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China;1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. School of Materials Science and Engineering, Harbin Institute of Technology, No. 92, West Da-Zhi Street, Harbin 150001, PR China;1. Heavy Machinery Engineering Research Center, Ministry of Education, Taiyuan University of Science and Technology, Taiyuan, 030024, China;2. College of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China;3. Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, China;1. Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, Canada;2. Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. School of Materials Science and Engineering, Hunan University, Changsha 410082, China |
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| Abstract: | As the lightest metal material, magnesium alloy is widely used in the automobile and aviation industries. Due to the crashing of the automobile is a process of complicated and highly nonlinear deformation. The material deformation behavior has changed significantly compared with quasi-static, so the deformation characteristic of magnesium alloy material under the high strain rate has great significance in the automobile industry. In this paper, the tensile deformation behavior of AZ31B magnesium alloy is studied over a large range of the strain rates, from 700 s−1 to 3 × 103 s−1 and at different temperatures from 20 to 250 °C through a Split-Hopkinson Tensile Bar (SHTB) with heating equipment. Compared with the quasi-static tension, the tensile strength and fracture elongation under high strain rates is larger at room temperature, but when at the high strain rates, fracture elongation reduces with the increasing of the strain rate at room temperature, the adiabatic temperature rising can enhance the material plasticity. The morphology of fracture surfaces over wide range of strain rates and temperatures are observed by Scanning Electron Microscopy (SEM). The fracture appearance analysis indicates that the fracture pattern of AZ31B in the quasi-static tensile tests at room temperature is mainly quasi-cleavage pattern. However, the fracture morphology of AZ31B under high strain rates and high temperatures is mainly composed of the dimple pattern, which indicates ductile fracture pattern. The fracture mode is a transition from quasi-cleavage fracture to ductile fracture with the increasing of temperature, the reason for this phenomenon might be the softening effect under the high strain rates. |
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| Keywords: | Tensile property High strain rates Temperature Fracture pattern |
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