| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
|
| Presentation Title |
Anisotropic Co-Deformation Behavior of Nanolamellar Structures in Additively Manufactured Eutectic High Entropy Alloys |
| Author(s) |
Yu Zou |
| On-Site Speaker (Planned) |
Yu Zou |
| Abstract Scope |
Laser-based directed energy deposition (DED) technique provides new opportunities for fabricating eutectic high entropy alloys (EHEAs) with directional nanolamellar structures that exhibit superior mechanical properties. The mechanisms of co-deformation, strengthening, fracture of the two constituent phases, and their resulting anisotropic mechanical properties, have not yet been systematically studied. Here we employ in situ synchrotron-based high-energy X-ray diffraction and X-ray tomography to study a DED-fabricated nanolamellar AlCoCrFeNi2.1 that is comprised of face-centered cubic (fcc) and ordered body-centered cubic (B2) phases. We find that such mechanical anisotropy is associated with the sequence of work hardening in the B2 and fcc phases, as well as martensitic transformation in the B2 phase. This study demonstrates that the DED-produced EHEAs exhibit the optimal strength-ductility synergy along the lamellar direction and provides a fundamental understanding of the co-deformation behavior of dual phases in directional nanolamellar structures. |