Abstract
The effect of aging and deformation on the microstructure and internal friction of rolled AZ31 magnesium alloy was investigated via optical micrograph (OM), transmission electron microscopy (TEM), and internal friction tests. The results revealed that the rolled sample underwent recrystallization after an aging treatment at 623 K, the average grain diameter of the sample aged for 0.5 h was 8.5 μm and the average grain size increased gradually with increasing aging time, this samples were used for tensile deformation tests. The results revealed that the density of dislocations and twin crystals increased with increasing deformation. In addition, an intragranular cellular substructure formed at a deformation level of 5%, and the deformation cells were further refined when the deformation was increased to 15%. Two internal friction peaks were observed for each of the rolled samples, aged at 623 K samples, and deformed samples, denoted P1 and P2. P1 peaks was around 450 K, corresponding to an activation energy of 116–120 kJ mol−1, which was attributed to grain boundary sliding. P2 peaks was around 525 K, corresponding to an activation energy of 132–139 kJ mol−1, which was attributed to internal friction correlated with precipitation of a secondary phase.
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