|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Multiscale In Situ Electron Microscopy Investigation of Deformation in Al 6061
||Josh Kacher, Yung Suk Yoo, John Emery, Jay Carroll
|On-Site Speaker (Planned)
Al 6061 is a heat-treatable alloy that achieves a high strength-to-weight ratio with its heterogeneous microstructure, which includes distributed intermetallic particles on the order of microns, sub-micron scale precipitates, and heterogeneities inherent to polycrystalline materials. Understanding how this complex microstructure dictates the local accumulation of defects is critical to understanding fracture mechanisms in Al 6061. In this study, notched Al 6061 dogbone samples were tested under tension in the scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) scans were collected periodically at interrupted strain stages. Select sub-regions were investigated using high-resolution EBSD to investigate the evolving strain fields around triple junctions and intermetallic particles. Additional in situ TEM straining experiments were conducted to investigate the interaction mechanisms between dislocations and the distributed second phase particles. Discussion will focus on mechanisms leading to defect accumulation in relation to microstructural heterogeneities and their relationship with ductile fracture of Al 6061.
||Planned: Supplemental Proceedings volume