Nucleation of recrystallized grains in multiple slipped structure without deformation band in aluminum single crystal

The characteristics of multiple slipped structure and the nucleation of rec rystallized grains (RGs) have been investigated using pure aluminum single crystals with an initial tensile axis (TA) orientation of [111] deformed in tension. By a scanning electron microscope (SEM), very short and wavy slip traces without deformation bands (DBs) were observed, in which the maximum misorientation was only approximately 5 degrees. By a transmission electro n microscope (TEM), it is found that a layered dislocation microstructure c onsisted of cells with dense dislocation walls (DDWs) was developed. Groups of the cells were mutually rotated, by approximately 4 degrees, about an a xis normal to the TA as if they maintained tensile strain and compressive s train by turns. After annealing, orientations of RGs were mainly rotated at angles of over 26 degrees about each [111] axis normal to four kinds of [1 11] slip planes in each adjacent deformed matrix (DM). It is renewed in mor e detail that the nucleation of the RGs with the [111] rotation relationshi p to each adjacent DM could be explained by the [111] rotation recrystalliz ation (nucleation) model. The [111] rotation relationships between the defo rmation textures and the corresponding annealing textures in FCC metals are selected in both stages of the nucleation of RGs as well as their growth. (C) 2000 Elsevier Science S.A. All rights reserved.