| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
J-42: In-Situ Investigation of Damage in the AlCoCrFeNi2.1 High Entropy Alloy |
| Author(s) |
Cal D. Siemens, David Wilkinson |
| On-Site Speaker (Planned) |
Cal D. Siemens |
| Abstract Scope |
The AlCoCrFeNi2.1 eutectic HEA (EHEA) is a duplex casting alloy, consisting of face-centered cubic (FCC) and body-centered cubic (BCC) phases, exhibiting high strength and moderate ductility. Various studies used alloying and thermomechanical processing approaches to improve this alloy’s mechanical properties. However, there has been little work published on the fundamental mechanisms controlling damage and fracture of this EHEA. This study uses in-situ techniques involving micro-digital image correlation (μ-DIC) and x-ray computed tomography (XCT) to characterize the distribution of deformation and damage evolution at the microscale while under strain. These methods were paired with scanning electron microscopy (SEM), nanoindentation, and fracture toughness to evaluate phase-specific composition, hardness, and defect sensitivity. We determine that micro-crack nucleation and propagation is a controlling fracture mechanism and have identified microstructural features that contribute to increased ductility of this EHEA following rolling of the as-cast structure. This suggests methods to improve ductility in future HEA development. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Characterization |