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High Cycle Fatigue Properties of Extruded AZ31 Magnesium Alloy


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High Cycle Fatigue Properties of Extruded AZ31 Magnesium Alloy
WU Yan-jun12ZHU Rong1LU Tian1WANG Jing-tao1
1. School of Materials Science and Engineering,NUST,Nanjing 210094,China; 2. Department of Electromechanical Engineering,Nanjing Communications Institute of Technology,Nanjing 211188,China
magnesium alloys high cycle fatigue twinning detwinning
TG113. 26
A number of uniaxial stress-controlled cyclic loading experiments are conducted for extruded AZ31 magnesium alloy in order to investigate the influence of tension-compression asymmetry on fatigue properties. The cyclic strain amplitude,peak strain and energy parameter are studied. The results show that the hysteresis loops exhibit asymmetry during initial fatigue cycles,but this asymmetry vanishes after 200 cycles. The peak compressive strain gradually decreases,and it reverses to tensile strain at about 200 cycle. Fatigue crack initiates at the twin bands in the surface, and the crack propagates along with specific twin boundaries. Twining and detwinning behaviors are often observed in the fatigue process due to texture and deformation mechanism,leading to the hysteresis loop asymmetry. The twins are crucial to the crack initiation and propagation.


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Last Update: 2012-02-28