Crystallographic orientation observation and mechanical properties evaluation of fine-grained pure aluminum

Abstract

In order to improve the material characteristics of single and polycrystals of pure aluminum, the relationships between crystallographic orientations and microstructures, and the mechanical properties were examined. Several conventional grain-forming procedures, such as accumulative roll bonding (ARB), equal-channel angular pressing (ECAP) and accumulative forging bonding (AFB), were performed to obtain the ultrafine-grained structure. Furthermore, some analytical results, such as crystal direction maps, inverse pole figure (IPF), and texture, were obtained from the SEM-electron backscattered diffraction pattern (EBSP). As a result, (1) for the ARB method, increases of strength and ductility were shown, since the cube orientation was developed; (2) for the ECAP method, in the extrusion direction (ED) plane at the die angle ψ = 100°, peculiar distributions of microstructure and hardness were obtained; (3) for the AFB method, stratified inclination microstructures were obtained, and thus the typical texture was also observed.