| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defect and Phase Transformation Pathway Engineering for Desired Microstructures
|
| Presentation Title |
Investigation of Nucleation Mechanisms Associated with Formation of Co-precipitates in Ni-based Superalloys |
| Author(s) |
Hariharan Sriram, Semanti Mukhopadhyay, Rongpei Shi, Michael Mills, Yunzhi Wang |
| On-Site Speaker (Planned) |
Hariharan Sriram |
| Abstract Scope |
Experimental studies have shown that IN 718-based alloys could form a rich variety of co-precipitate microstructures through careful control of alloy chemistry and heat treatment. Although the growth and coarsening mechanisms of the co-precipitates have been investigated, nucleation of γ" or γ' on existing γ' or γ" core is yet to be understood. In this presentation we will show a quantitative assessment on the effects of concentration and stress field associated with an existing and growing γ' or γ" precipitate on the nucleation of γ" or γ' precipitates, leading to the formation different co-precipitate configurations. The chemical driving force for nucleation are calculated using the CALPHAD approach and databases, while the contributions from the elastic interaction and interfacial energies between different interfaces are quantified by using a combination of a multi-phase field free energy formulation and a saddle point search algorithm, i.e., the nudged elastic band method |
| Proceedings Inclusion? |
Planned: |
| Keywords |
ICME, Computational Materials Science & Engineering, Phase Transformations |