DEFORMED STRUCTURE AND CRYSTAL ORIENTATION AT DEFORMATION BANDS IN [011]ALUMINUM SINGLE-CRYSTALS

To clarify relationship between activate slip systems and formation of recrystallized grains along deformation bands (DBs), structural chang es for 3 to 70% tensile strains in 99.99 mass% aluminum single crystal s with a tensile axis of [011] were investigated first of all in this paper. Above 15% strains, the DBs were formed, and two different types of pseudo-boundaries which appear ''straight'' (SPB) and ''wavy'' (WP B) ones were observed between the DBs and deformed matrixes (DMs). The authors classified the DB as ''a special type of band of secondary sl ip'' (SBSS). The development of SBSS structure occurred simultaneously due to two processes, the increase of the number of SBSS and the migr ation of the WPBs. The ''secondary deformation bands'' (SDBs) called b y the authors started to form along the WPBs at 70% strain. Dynamic re covery in the SDBs near the WPB might occur al 70% strain in deformati on, because of operation of the third and/or fourth activated slip pla ne (s) in addition to the preexisting operation of the two slip planes . The effect of changes in deformation structure on recrystallization behavior will be reported elsewhere.