kristalli mittehomogeense (ebaühtlase) plastse deformeerumise tulemusena moodustunud kristallivõre erineva orientatsiooniga piklik, märgatava paksusega (mitu mikromeetrit) piirkond, part of a crystal that have rotated differently during plastic deformation to produce elongated area of noticeable thickness (several microns) of distinct average lattice orientation