| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
J-61: Order-Disorder Effects in Mixed BCC/FCC FeNiMoW MPEA |
| Author(s) |
Sarah E. O'Brien, Matthew J Beck |
| On-Site Speaker (Planned) |
Sarah E. O'Brien |
| Abstract Scope |
MPEAs of mixed BCC and FCC elements yield complex multi-phase microstructures, often including solid solution phases that are themselves MPEAs. Equiatomic multi-phase FeNiMoW alloys have been demonstrated to exhibit desirable high-strain rate mechanical properties attributed to adiabatic shear banding (ASB). Evidence suggests that ASB in equiatomic FeNiMoW alloys occurs in grains containing lamellae-like alternating regions of an FCC solid solution phase (approximate composition Fe<sub>40</sub>Ni<sub>40</sub>Mo<sub>15</sub>W<sub>5</sub>) and a Mo rich/W poor rhombehedral phase. Here we demonstrate the application of DFT-based atomistic calculations to reveal the heat capacity, elastic, magnetic, and order-disorder properties (including transition temperatures) of solid solution and “semi-ordered” MPEAs using Fe<sub>40</sub>Ni<sub>40</sub>Mo<sub>15</sub>W<sub>5</sub> as an application-relevant model system. Results suggest the importance of order-disorder transitions associated with BCC elements in the FCC lattice in determining thermodynamic stability and mechanical properties of this MPEA. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Mechanical Properties |