Abstract
The hot workability of AA 6015 alloy has been studied by means of torsion tests over the temperature range 300–500°C and strain rate of 0.1 s−1. The ductility was very low at 300–350°C but attained large values at higher temperatures. Optical microscopy showed original grains partially elongated up to 350°C and recrystallized grains at higher temperatures. Electron metallography revealed a distribution of fine Mg2Si precipitates with unrecovered structures at lower temperatures and well defined subgrain with the presence of large Mg2Si particles at temperatures higher than 400°C. The effect of precipitate size on dynamic restoration was analysed.
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