An orientation image microscope was used to characterize the orientation features in a deformed Mn–15at%Cu alloy. It was found that twinning and subsequent de-twinning prevailed during the deformation process of the twin bands, which were separately identified as massive and twinning type bands. The <111> and <100> fibers steadily developed along the tensile direction as the pre-strain increased. The internal friction due to the movement of the twin boundary was investigated using a dynamic mechanical analyzer. It was deduced that the twin-boundary internal friction greatly depended on the arrangement of the twin variants, which could be changed by deformation or a thermal treatment.

Internal Friction Behavior of Twin Boundaries in Tensile-Deformed Mn–15at%Cu Alloy. Q.Tian, F.Yin, T.Sakaguchi, K.Nagai: Materials Science and Engineering A, 2006, 442[1-2], 433-8