Deformation defects and electron irradiation effect in nanostructured Al-Mg alloy processed by severe plastic deformation
(1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
2. Department of Materials Science and Engineering,
Norwegian University of Science and Technology (NTNU), NO-7491, Trondheim, Norway;
3. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450000, Russia)
2. Department of Materials Science and Engineering,
Norwegian University of Science and Technology (NTNU), NO-7491, Trondheim, Norway;
3. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450000, Russia)
Abstract: In order to explore the exact nature of deformation defects previously observed in nanostructured Al-Mg alloys subjected to severe plastic deformation, a more thorough examination of the radiation effect on the formation of the planar defects in the high pressure torsion (HPT) alloys was conducted using high-resolution transmission electron microscopy (HRTEM). The results show that high density defects in the HRTEM images disappear completely when these images are exposed under the electron beam for some duration of time. At the same time, lattice defects are never observed within no-defect areas even when the beam-exposure increases to the degree that holes appear in the areas. Therefore, it is confirmed that the planar defects observed in the HPT alloys mainly result from the significant plastic deformation and are not due to the radiation effect during HRTEM observation.
Key words: Al-Mg alloy; severe plastic deformation; high pressure torsion; electron irradiation; deformation defects; transmission electron microscopy