Formation of deformation band in 5083-O aluminum alloy sheet tensile-deformed at 318 K

Abstract

It is well known that plastic deformation results in formation of deformation bands for some aluminum alloy sheets. However, there are few reports dealing with the formation characteristics of deformation bands, such as a position and an order of deformation bands. 5083-O aluminum alloy sheet was tensile deformed in order to investigate in detail the formation characteristics of deformation bands. The tensile test was carried out at 318 K and the effects of cross head speed on the formation characteristics were also examined. Many of second deformation band were formed to the first one in the partially overlapping shape, and a similar tendency was ascertained about the deformation band afterwards. Since the deformation bands formed in the early stage had a tendency to generate in the order, the formation behavior of deformation bands was possible to classify into two patterns. The ordering formation of deformation bands was affected by both an interruption period of tensile test and a geometrical shape of previously formed deformation bands. It is thought that microstructure changes due to atomic diffusion brought the variation of ordering formation of deformation bands. The amplitude of a load fluctuation in the load versus displacement curves was changed depending on the position where the deformation band was formed.