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Hot deformation behavior andfl ow stress modeling of annealed AZ61 Mg alloys
Authors:Chinghao Liao  Horngyu Wu  Chengtao Wu  Fengjun Zhu  Shyong Lee
Affiliation:Department of Mechanical Engineering, National Central University, 300, Jhongda Road, Jhongli 320, Chinese Taipei;Department of Mechanical Engineering, Chung Hua University, 707, Sec. 2, WuFu Road, HsinChu 300, Chinese Taipei;Department of Mechanical Engineering, Chung Hua University, 707, Sec. 2, WuFu Road, HsinChu 301, Chinese Taipei;Department of Mechanical Engineering, Chung Hua University, 707, Sec. 2, WuFu Road, HsinChu 302, Chinese Taipei;Department of Mechanical Engineering, National Central University, 300, Jhongda Road, Jhongli 320, Chinese Taipei
Abstract:In this study, the hyperbolic-sine type constitutive equation was used to model the flow stress of annealed AZ61 magnesium (Mg) alloys. Hot compression tests were conducted at the temperatures ranging from 250 °C to 450 °C and at the strain rates ranging from 1×10–3 s−1 to 1 s−1 on a Gleeble-3500 thermo-simulation machine. Constitutive equations as a function of strain were established through a simple extension of the hyperbolic sine constitutive relation. The effects of annealing heat treatments on the variations in constitutive parameters with strain were discussed. The hot compressive flow curves exhibited typical features of dynamic recrystallization. Multiple peak flow curves were observed in the annealed specimens upon testing at a strain rate of 1×10−1 s–1 and at various temperatures. Variations in constitutive parameters with strain were related to flow behavior and dependent on the initial conditions of the test specimens. The flow stresses of annealed AZ61 Mg alloys were predicted well by the strain-dependent constitutive equations of the hyperbolic sine function under the deformation conditions employed in this study.
Keywords:AZ61 Mg alloy   Constitutive analysis   Dynamic recrystallization   Flow stress modeling   Strain-dependent constitutive parameters
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