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周洁,吴任东,袁朝龙,焦玮,李滔.不同工艺状态下AZ31B镁合金热压缩变形行为研究[J].稀有金属材料与工程(英文),2020,49(5):1793~1798.[ZHOU Jie,WU Rendong,YUAN Chaolong,JIAO Wei and LI Tao.Deformation behavior research of AZ31B magnesium alloys with different process states under thermal compression[J].Rare Metal Materials and Engineering,2020,49(5):1793~1798.]
Deformation behavior research of AZ31B magnesium alloys with different process states under thermal compression
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Received:April 08, 2019  Revised:April 22, 2019
DOI:
Key words: Stress-strain curves  AZ31B magnesium alloy  Initial process states  Constitutive equations
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Author NameAffiliation
ZHOU Jie,WU Rendong,YUAN Chaolong,JIAO Wei and LI Tao  
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Abstract:
      Deformation mechanism of magnesium alloys is complex and prone to be affected by initial process states and deformation conditions of materials during the thermal process, therefore, exhibits different stress-strain relationships. Stress-strain curves of casting and wrought magnesium alloys AZ31B were obtained by Gleeble-1500, and the constitutive models of magnesium alloys under two different initial process states were constructed based on the Arrhenius hyperbolic sine function, the effect of initial process states on stress-strain curves and deformation mechanism of magnesium alloy were analyzed. Experimental results show that wrought magnesium alloy appears shear fracture along 45° direction due to deformation texture and amounts of twins at low temperature when the strain rate is greater than 0.1s-1. However, The deformation mechanisms of casting and wrought magnesium alloys AZ31B keep the same at high temperatures and low strain rates, therefore, the stress-strain curves of them are basically similar. The hardening index n and activation energy Q of wrought magnesium alloys are smaller than casting magnesium alloys.