Abstract
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 kJ/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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