Constitutive Modeling and Hot Deformation Behavior of Duplex Structured Mg–Li–Al–Sr Alloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2016年第12期
论文作者：Yan Yang Xiaodong Peng Fengjuan Ren Haiming Wen Junfei Su Weidong Xie
文章页码：1289 - 1296
摘 要：Hot deformation behavior of an as-extruded duplex structured Mg–9Li–3Al–2.5Sr alloy is investigated via hot compression tests conducted at 200–350 °C with strain rate of 0.001–1 s-1.The flow behavior of Mg–9Li–3Al–2.5Sr alloy can be described accurately by hyperbolic sine constitutive equation and the average activation energy for deformation is calculated as 143.5 k J/mol.Based on a dynamic materials model,the processing maps of Mg–9Li–3Al–2.5Sr alloy which describe the variation of power dissipation efficiency are constructed as a function of temperature and strain rate.The processing maps exhibit an area of discontinuous dynamic recrystallization occurring at 280–300 °C with strain rate of 0.001–0.01 s-1,which corresponds to the optimum hot working conditions.
Yan Yang1,2，Xiaodong Peng1,2，Fengjuan Ren1，Haiming Wen3,4，Junfei Su1，Weidong Xie1,2
1. College of Materials Science and Engineering,Chongqing University2. National Engineering Research Center for Magnesium Alloys,Chongqing University3. Department of Nuclear Engineering & Health Physics,Idaho State University4. Characterization and Advanced PIE Division,Idaho National Laboratory
摘 要：Hot deformation behavior of an as-extruded duplex structured Mg–9Li–3Al–2.5Sr alloy is investigated via hot compression tests conducted at 200–350 °C with strain rate of 0.001–1 s-1.The flow behavior of Mg–9Li–3Al–2.5Sr alloy can be described accurately by hyperbolic sine constitutive equation and the average activation energy for deformation is calculated as 143.5 k J/mol.Based on a dynamic materials model,the processing maps of Mg–9Li–3Al–2.5Sr alloy which describe the variation of power dissipation efficiency are constructed as a function of temperature and strain rate.The processing maps exhibit an area of discontinuous dynamic recrystallization occurring at 280–300 °C with strain rate of 0.001–0.01 s-1,which corresponds to the optimum hot working conditions.
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