| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
Applying APT and LKMC Simulations to a Model Ni-based Superalloy |
| Author(s) |
Chantal K. Sudbrack, Zugang Mao, David N. Seidman |
| On-Site Speaker (Planned) |
Chantal K. Sudbrack |
| Abstract Scope |
Precipitation strengthened nickel-based superalloys are used in a variety of demanding,
structural applications due to their excellent mechanical properties at elevated
temperatures. The ability to control microstructure stability of these complex alloys
requires an understanding of the fundamental aspects of the gamma-prime precipitate
evolution. In this talk, atom-probe tomography (APT) measurements and lattice kinetic
Monte Carlo (LKMC) simulations are combined to reveal aspects of the nucleation,
growth, and coarsening sequence in a model Ni-Al-Cr superalloy that is isothermally
aged at 600°C. This combined approach allows precise compositional measurement on a
nanometer scale, and gives insight into the short-range ordering present prior to
precipitation, 3D morphological development, and diffusional processes that drive the
solid-state transformation. Early-stage coagulation and coalescence of neighboring
precipitates is established and is uniquely shown by LKMC simulations to result from
correlated cluster diffusion, primarily along the <110>-directions, where the experimental
and simulated compositional profiles show good agreement. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |