| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Understanding Fracture Initiation Under Bending Conditions in AA6451 Using a Multiscale and Multimodal Electron Microscopy Approach |
| Author(s) |
Josh Kacher, Yung Suk Jeremy Yoo, Sazol Das |
| On-Site Speaker (Planned) |
Josh Kacher |
| Abstract Scope |
AA6xxx is a class of heat-treatable Al alloys that achieves a high strength-to-weight ratio by its heterogeneous microstructure, which includes intermetallic particles on the order of microns, sub-micron scale precipitates and dispersoids, and heterogeneities inherent to polycrystalline materials. Understanding how this complex microstructure dictates bending performance of these alloys, including fracture initiation processes, is critical for their expanded use in applications such as the automotive industry. In this study, different compositions and heat treatments of AA6451 samples were tested under bending and investigated post mortem. Crack formation was correlated at the mesoscale to orientation information using electron backscatter diffraction to gain a statistical understanding of microstructural influences on crack initiation. This statistical understanding was linked to specific deformation modes by fabricating lamellae from select locations for transmission electron microscopy and transmission Kikuchi diffraction analysis. Discussion will focus on the role of microstructure on dictating fracture initiation in AA6451. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |