Abstract
The microstructures and the bending performance in rolling direction (RD) and transverse direction (TD) of an AA6016-T4P automotive sheet were investigated. The surface necking forming mechanism together with the initiation and propagation of shear bands during bending were studied in detail. The results indicated that no macro-crack formed in both RD and TD specimens after 180o bending, but RD specimen exhibited inferior bendability compared with TD specimen, showing more severe surface necking. The anisotropy of surface necking in the AA6016-T4P sheet was caused by special crystallographic texture, rather than grain shape and spatial distribution of the constitute particles. The total volume fraction of GossND90, R, P, and Cu orientations was almost twice as that of Goss orientation in the AA6016-T4P sheet, resulting in the facilitation of the initiation and propagation of shear bands in the RD specimens. Two bundles of shear bands intersected at the surface where strain localized, forming the surface necking, so RD direction had more severe surface necking than TD direction.
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