|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Creating Bulk Ultrafine-grained Laminated Structures by Equal-Channel Angular Pressing
||Philipp Frint, Martin F.-X. Wagner
|On-Site Speaker (Planned)
In this study, we report on the formation of laminated microstructures after processing of AA6060 by extrusion and subsequent ECAP at room temperature. Macroscopic deformation bands, embedded in a matrix containing significantly less strain, are observed. EBSD and TEM reveal an ultrafine-grained microstructure in the shear bands, while the matrix remains coarse grained. We analyze the local (anisotropic) mechanical behavior of the bands by (nano)-indentation and micro shear testing of individual bands. We furthermore consider local vs. global behavior and the role of local strain rate sensitivity and load path dependent behavior. Digital image correlation data obtained during compression testing clearly show that further straining exclusively takes place within the shear bands when their orientation is 45° to the applied force, although the shear bands exhibit a higher strength. We discuss how this type of micromechanical behavior can be fully rationalized by considering local textures and strain rate sensitivities.