Abstract
Microstructure evolution of AZ31 magnesium alloy in annealing process had been investigated by experiment study at heating temperature range of 150°C–450°C and holding time range of 15 min–60 min. The effects of heating temperature and holding time on grain growth had been analyzed. The results presented that the grain size tends to grow up with the increase of holding time at a certain temperature. At a certain holding time, the grain size increased firstly and then decreased at the heating temperature range of 150–250°C. And when heating temperature is higher than 250°C, the grain grows up gradually with the increase of heating temperature. The grain growth model of AZ31 Mg alloy has been established by regression based on the experimental data at temperature of 250–450°C, and the relative error between model calculation results and experimental results is less than 19.07%. Activation energy of grain growth of AZ31 magnesium alloy had been determined.
Highlights
Deformation mechanism of magnesium alloy sheet is glide in base surface and twin in taper surface
With rolling deformation at low temperature of magnesium alloy sheet, a very high intensity of basal texture formed in the rolling direction
When AZ31 magnesium alloy deformed by uniaxial compression at 400∘C and a strain rate of 0.3 s−1, many extension twins appeared, and some of the selected twins obeyed a Schmid factor criterion [6]
Summary
Deformation mechanism of magnesium alloy sheet is glide in base surface and twin in taper surface. With rolling deformation at low temperature of magnesium alloy sheet, a very high intensity of basal texture formed in the rolling direction. The texture hindered starting the basal slip system in low temperature and affected the forming performance of the magnesium alloy sheet [2]. The annealing processes operating in hot-deformed magnesium alloy with continuous dynamic recrystallized grain structures can be mainly controlled by grain coarsening without texture change [4]. Considering the microstructure evolution of friction stir welding (FSW) of AZ91 magnesium alloy, a model is established based on the combination of cellular automaton, and it considered the ability of presented model in demonstrating the nucleation and grain growth stages during dynamic recrystallization (DRX) [8].
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