Du, Keming

Hansen, Niels

Huang, Tianlin

Huang, Xiaoxu

Wu, Guilin

Fine scale lamellar structures develop during cold rolling of metals to high strain. However a mechanically assisted triple junction motion process occurs during cold rolling, which removes lamellar boundaries and balances the decrease in lamellar boundary spacing. Segregation and precipitation at the lamellar boundaries are expected to suppress the triple junction motion and therefore enhance the structural refinement. In this study an Al-2wt.%Cu alloy has been cold rolled in two steps with an intermediate annealing: first cold rolled to a 75% thickness reduction forming a microstructure of lamellar morphology, followed by an annealing at 100℃ for 30 minutes, and then further cold rolled to the final thicknessreduction of 98%. An average lamellar boundary spacing of 113nm has been achieved, which is much smaller than the value of 139 nm obtained in the sample cold rolled to the same strain but without intermediate annealing.<br/

Enhanced structural refinement via intermediate annealing in cold rolled Al-2%Cu

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