Effect of Annealing Condition on Earing and Texture Formation in Cold Rolled AA5182 Aluminum Alloy

The effect of annealing condition on earing and recrystallization texture formation in cold rolled AA5182 aluminum alloy was investigated. The earing of AA5182 aluminum alloy depends strongly on the heating rate. At low heating rate (0.01~1K/s) the ears on drawn cup situated at 45 deg. to the sheet rolling direction. At high heating rate (10K/s) the ears were lower. The earing behavior was characterized by the texture components. As the heating rate increases, the intensity of cube component increases whereas the intensities of Brass, Cu and SB components decrease. The transformation kinetics of recrystallization during isothermal annealing was quantified by the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation. The results show that the JMAK exponent for recrystallization was determined to be 2.4 at 553K and around 4 at 573K and 593K. The apparent activation energy for recrystallization was estimated to be 203kJ/mol.