Experimental investigation of strain path effects on mechanical properties, forming limit curves, and texture evolution of AA1050 aluminum sheet

Effect of strain path change on mechanical properties, formability, and forming limit of 1050 aluminum alloy is discussed experimentally in this study. Various strain paths are done in three modes of unidirectional, reverse, and cross rolling. Grain size, hardness, stress-strain diagram, and forming limit in two ratios of 20% and 40% for three rolling modes are compared. Results show that the grain size in rolled sheet in cross mode is smaller than that in other modes. Moreover, the strength and elongation of unidirectional and cross rolled samples sheets are more than those of other modes. In contrast, the hardness of the rolled samples in unidirectional and cross modes is almost equal and more than that of reversed samples. Moreover, cross rolling of sheet leads to normal anisotropy decrease, in which that R craves to 1. Forming limit of rolled sheets is developed significantly in cross mode compared to other modes, in a way that for 40% reduction ratio, the amount of FLC0 is 0.113 for cross rolling, 0.09 for unidirectional rolling and 0.081 for reverse rolling. Forming limit in unidirectional and reverse rolling modes is a function of the loading path.