|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
||Does Grain Boundary Character Matter? Intergranular Failure in Al Alloys under Bending
||Josh Kacher, Sazol Das, Yung Suk Jeremy Yoo
|On-Site Speaker (Planned)
AA6xxx is a class of heat-treatable Al alloys that are attractive to the automotive industry due to their high strength-to-weight ratio. Past research has indicated that these alloys fail under bending via intergranular crack initiation and propagation, suggesting grain boundary engineering as a potential pathway towards increasing their fracture resistance. In this study, we employed multiscale electron microscopy techniques, including electron backscatter diffraction and site specific transmission electron microscopy, to investigate the role of microstructure in failure initiation under bending. We found that crack formation is actually offset slightly from the grain boundary plane. There was no correlation between grain boundary rotation angle and crack formation, though the angle between the sample surface and boundary plane did play an important role, with acute angles more likely to form cracks. Discussion will focus on the role of microstructure on dictating fracture initiation in AA6xxx.
||Characterization, Mechanical Properties, Aluminum