Cyclic softening of ultrafine-grained AZ31 magnesium alloy processed by equal-channel angular pressing |
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| Authors: | Rong Zhu Yan Jun Wu Wen Qing Ji Jing Tao Wang |
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| Affiliation: | 1. Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2. Nanjing Communications Institute of Technology, Nanjing 211188, China;1. Mechanical and Mechatronics Engineering Department, University of Waterloo, Waterloo, ON, Canada;2. Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia;1. State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. Chongqing Academy of Science and Technology, Chongqing 401123, China;3. Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China;4. Shanghai Aerospace Equipment Manufactory, No.100 Huaning Road, Minhang District, Shanghai 200240, China;1. Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia;2. Mechanical and Mechatronics Engineering Department, University of Waterloo, Waterloo, ON, Canada |
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| Abstract: | The low-cycle tension–compression fatigue tests were performed at ambient temperature on ultrafine grained AZ31 magnesium alloy processed by equal channel angular pressing. All samples exhibited cyclic softening, and the softening effect increased with increasing total strain amplitude. Observations by optical microscope revealed that pronounced recrystallization occurred, and the direction of larger axis of recrystallized grains was nearly 45° with respect to the loading axis. Local grain coarsening leads to the formation of dense shear localization, while line-like damage traces remain in fine grains. A model is proposed to account for the recrystallization, based on the characteristic distribution of defects introduced by equal channel angular pressing. |
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