EBSD und STEM an hochgradig plastisch verformten Aluminiumlegierungen

Abstract

Abstract After aluminum alloys undergo severe plastic deformation there is an interest in what grain refining is obtained and is determined from the orientation data detected from backscatter electron diffraction in lateral resolution. The quality of backscatter diffraction depends on the fraction of successful indexings, which presupposes an appropriate preparation of the surface. Vibration polishing results in a matrix nearly free of deformation and excellent levelling of the precipitates whereas relief formation (often occurring in oxide polishing) and dissolution (often occurring in electro-polishing) of those phases will reduce the band contrast and indexing quality. The results thus obtained from backscatter electron diffraction are backed by scanning electron microscopy images in transmission.