Gefügeanalyse von Blechen aus der Aluminiumlegierung 5182 zur verbesserten Ziehfähigkeit beim Walzumformen

To fabricate aluminum alloys with good drawability, the texture evolution of AA5182 sheets after rolling with high reduction ratios and subsequent annealing was studied. The measurement of the deformed textures was carried out for sheets with high reduction ratio and the change of the recrystallization texture was investigated after heat‐treatments of the rolled sheets. Rolling without lubrication and subsequent annealing led to the formation of favorable rot‐C ND {001}<110> and γ‐fiber ND//<111> textures in AA5182 sheets. From the results, the γ‐fiber ND//<111> component well evolved during rolling at high l /δ parameter of 6.77. The initial shear deformation texture, especially, the γ‐fiber ND//<111> texture was not rotated during heat treatment at holding time of 180~7,200 sonds on AA5182 in present rolling condition. Since the measured textures of the AA5182 sheets were nearly the same as IF (interstitial free) steel, the plastic strain ratio ( R ‐value) were measured. The measurement of the plastic strain ratio was carried out for the AA5182 sheets which were cold rolled by using the symmetric roll and annealed in order to analyze the sheet drawability. The average plastic strain ratio of the AA5182 sheets was 1.50. It was considered that the higher plastic strain ratio resulted from the γ‐fiber ND//<111> component evolved during rolling and maintained during annealing. Therefore, the AA5182 sheets were fabricated by rolling having well evolved γ‐fiber ND//<111> texture which is advantageous for a good drawability of the sheets.