| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Fundamental Investigation of Multi-Principal Element Alloy (MPEA) Design and Processing Research to Explore Additive Manufacturing (AM) Effects |
| Author(s) |
Iver E. Anderson, Emma White, Duane Johnson, Timothy Prost, Ralph Napolitano, Andrew Kustas, Nicolas Argibay |
| On-Site Speaker (Planned) |
Iver E. Anderson |
| Abstract Scope |
Results are reported that span the spectrum between advanced alloy theory prediction of a MPEA composition, 19Al-19Fe-19Ni-19Co-19Cr-5Cu (at.%), to specific crystal structure selection and verification experiments that range from chill casting to powder synthesis by close-coupled gas atomization (CC-GA) to AM building by directed energy deposition (DED), and through post-build heat treatment of the sample. Alloy design and modeling was based on an all-electron theory, addressing chemical disorder, where valence-electron concentration is a key determinant for tuning elemental concentrations. “Spider” plots based on binary, piece-wise formation energies narrowed the MPEA composition. Microstructural analysis verified alloy buttons from arc melting/chill casting as single as-solidified phase. Gas (Ar) atomization synthesized the quantity and size range of feedstock powder needed for DED. Dense AM builds were performed by laser engineered net-shaping. Critical structural, mechanical, and microstructural analysis of the material forms are described. Funded by USDOE-EERE-AMO program through Ames Lab contract no. DE-AC02-07CH11358. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Entropy Alloys, Powder Materials |