| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Temperature Creep Properties of Advanced Structural Materials
|
| Presentation Title |
CALPHAD Alloy Design for Diffusion-mediated Plasticity-Induced Phase Transformations for Creep Resistant Multicomponent Principal Elemental Alloy |
| Author(s) |
Jennifer LW Carter, Sipei Li |
| On-Site Speaker (Planned) |
Jennifer LW Carter |
| Abstract Scope |
All materials exhibit a reduction in strength as a function of temperature; this is inherently important for enabling thermo-mechanical manufacturing (>0.7Tm) but limits the subsequent creep resistance during applications (0.4Tm). It is hypothesized, that alloys in the Ni-Co-Cr MPEA space could exhibit a diffusion-mediated phase transformation induced plasticity (dm-TRIP) creep strengthening mechanism. The CALPHAD method was used to computationally suppress the stable FCC phase to explore the relative stability of the secondary unstable and metastable phases: Hexagonal Closed Packed (HCP) and the ordered sigma phase. Compositions where HCP (proxy for a stacking fault) is less stable than sigma, and sigma is metastable to FCC, could exhibit dm-TRIP. The stacking fault will be thermodynamically driven to form sigma prior, or instead of (if kinetics are right), FCC phase; thus strengthening the alloy. The motivation, computational approach, and proposed alloys are presented in this work. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Modeling and Simulation, Phase Transformations |