About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials for High Temperature Applications: Next Generation Superalloys and Beyond
|
Presentation Title |
Modeling Planar Fault Energies in Ordered D022 Structures |
Author(s) |
K V Vamsi, Tresa M Pollock |
On-Site Speaker (Planned) |
K V Vamsi |
Abstract Scope |
High temperature structural materials such as superalloys are strengthened by coherent intermetallic precipitates, including γ' (L12 structure, cubic) and γ'' (D022 structure, tetragonal) embedded in a fcc matrix. These precipitates are ordered and a variety of deformation mechanisms involving creation of planar faults are reported in the precipitate shearing mechanical deformation regimes. However, due to the complex crystal structure of the γ'' and its low symmetry, the deformation mechanisms are complex in D022 containing alloys and the knowledge on planar fault energies is very limited. With growing literature in the high entropy compositions strengthened by γ'', there is a need for better understanding of the mechanisms and the underlying planar fault energies in γ''. A high-throughput diffuse multi-layer fault model is employed to investigate the proximate structures to estimate planar fault energies in D022. The new methodology and effect of alloying on fault energies in Ni3Nb will be discussed. |
Proceedings Inclusion? |
Planned: |