Abstract
High-temperature deformation of Mn51Al47C2 alloy was investigated through the hot compression tests at the temperature range of 750 °C–800 °C and strain rate of 0.001–1 s−1, where due to the dynamical transformation of τ phase to ε phase, an excessive softening occurs in flow curves. The kinetics of dynamic phase transformation is studied by modified Avrami's equation, and the activation energy of deformation was assessed by applying a standard approach on critical and steady-state stress. It was revealed that the deformation activation energy changed as the phase transformation occurred. Moreover, a physically realistic model is proposed to describe the hot deformation flow curve including strain-induced phase transformation behavior of Mn–Al alloy. The comparison of predicted data with measured ones conveys that the developed formulation has a reasonable accuracy to model the flow stress.
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