Abstract
Hot formability of AA 6061 PM aluminium alloy has been studied by torsion tests performed in the temperature range from 250 to 500°C and strain rate from 0.005 to 0.5 s −1. Experimental results show that flow stress increases with strain up to a maximum and then decreases to rupture. The flow stress increases when temperature decreases and strain rate increases with a pronounced effect at the higher temperatures. Ductility, measured as strain to failure, is dependent on strain rate and temperature; as the temperature rises, it increases up to a peak value and then decreases. The hot deformation behaviour has been related to the microstructural evolution and to the different micromechanisms operating at the different test conditions. The role of dynamic restoration processes has been analyzed and discussed in detail.
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