Study of the recrystallization of AW-5049 and AW-5754 twin-roll cast alloys by EBSD

Abstract

Study of the recrystallization of AW-5049 and AW-5754 twin-roll cast alloys by EBSD The paper presents the results of an investigation of the annealing response of sheets prepared from two twin-roll continuous cast aluminium -magnesium alloys. Sheets of 1 mm thickness prepared by cold rolling with 80 % reduction in thickness were annealed using an industrial regime with slow heating, holding at 350 8C and slow cooling. Hardness measurements and tensile tests allowed estimation of the magnitude of deformation recovery at different annealing stages. The evolution of the grain structure was studied by electron backscatter diffraction in a scanning electron microscope. The recrystallization in AW-5754 occurs at lower temperatures than in the AW-5049 material. The recrystallized grains are finer in the former alloy. The tensile properties of both AW-5754 and AW-5049 sheets are isotropic. Soft AW-5754 sheets exhibit less pronounced texture than AW-5049 ones.