Work Hardening of Al-1%Mg by Equal Channel Angular Pressing
Haghayeghi, P. Kapranos, “Work Hardening of Al-1%Mg by Equal Channel Angular Pressing”, Materials Letters, Vol.129, 2014, PP.182-184.
When Equal Channel Angular Pressing (ECAP)was performed on an Al–1 wt%Mg alloy, it was noticed that at ultrafine grain sizes (less than1 μm) the material did not display any yield point in the initial stress–strain response. However, at grainsizesabove1 μm stress–strain curves behaved as expected. Moreover, for grain sizes of less than1 μm, Luders bands completely disappear in the diagram. It is Suggested that this effect can be attributed to the evolution(rapid)rate of sub-boundary misorientation at the early stages of deformation. This behaviour has been reported before but no available work hardening theory is capable of explaining this grain size effect on stage III until now.