Abstract
The dynamic recrystallization (DRX) behavior of as-extruded AM50 magnesium alloy was modelled and simulated by a cellular automaton (CA) method. Isothermal compression experiments were conducted, and the characteristic parameters in the CA model were obtained by the testing stress–strain flow curves in a wide temperature range of 250–450 °C and strain rate range of 0.001–10 s−1. The flow stress, DRX volume fraction and DRX grain size of the as-extruded AM50 magnesium alloy were predicted by CA simulation. The results showed that the DRX behavior of the studied magnesium alloy was susceptive with the temperature and strain rate; meanwhile, the prediction results were approximate to the experimental values, indicating that the developed CA model can make a confident estimation on the DRX behavior of the as-extruded AM50 magnesium alloy in high temperature conditions.
Highlights
The application of light alloys and their composites is considered as an important lightweight way in advanced industrial fields [1,2,3,4]
The results indicate that the cellular automaton (CA) simulation results can be used to predict the microstructural morphologies of AM50 Mg alloy under large thermoplastic deformation
A CA model was proposed for predicting the DRX behavior of AM50 Mg alloy during hot deformation in a wide temperature range of 250–450 ◦ C and a strain rate range of 0.001
Summary
The application of light alloys and their composites is considered as an important lightweight way in advanced industrial fields (e.g., automobile, aerospace and electronics) [1,2,3,4]. The dynamic recrystallization (DRX) plays an important role in the microstructure refinement during thermoplastic deformation of magnesium alloys [9]. Li et al investigated the microstructural evolution of AZ80 magnesium alloy by CA model coupled with finite element simulation [18]. E.g., modified Avrami type equations, are widely used for describing behavior of magnesium alloys [20,21,22] These pheThe the CADRX simulation results from the physical-based recrystallization kinetic model. Phenomenonomenological equations are experience-depended without physical meanings), and logical models are difficult to preciously predict the complex(i.e., microstructure evolution can only usedwords, in somea special deformation these phenomenologduring DRX [23].
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