Calculation of plastic strain ratio of AA1050 Al alloy sheet processed by heavy asymmetric rolling–annealing followed by light rolling–annealing

Abstract

A study has been made of the texture evolution and the plastic strain ratios (the R-values) of AA1050 Al alloy sheets which were subjected to heavy asymmetric rolling–annealing followed by light rolling–annealing to improve the deep drawability of the Al alloy sheets. The heavily rolled Al alloy sheet evolved a shear texture consisting of {001}〈110〉 and ND//〈111〉. The R-values of the heavily rolled (90%) and annealed Al alloy sheets were measured and calculated from the measured sheet textures using the Bunge method. The calculated R-values were in good agreement with the measured data. A light rolling by 20% and annealing at 400°C following the heavy rolling–annealing decreased the rotate cube texture component, {001}〈110〉, of the sheet texture and in turn increased the ND//〈111〉 component and gave rise to the highest average R-value (R‾) and the lowest |ΔR| value. The calculated R‾ and |ΔR| values were in fairly good agreement with the measured data.