About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Discrete Dislocation Dynamics Investigation of Partial Dislocation interaction with γ’ Precipitates in Nickel- and Cobalt-based Superalloy |
Author(s) |
Dylan Madisetti, Jaafar El-Awady |
On-Site Speaker (Planned) |
Dylan Madisetti |
Abstract Scope |
A three-dimensional discrete partial-dislocation dynamics code is developed and implemented to examine dislocation-precipitate interaction in Ni- and Co-base single crystal superalloys. This work examines the effect on Ni and Co concentration on the different dislocations γ’ precipitate cutting or looping mechanisms. The current simulations account for the energy and mechanisms associated with the formation of anti-phase boundaries (APB) and super-lattice intrinsic (SISF) stacking faults in addition to complex (CSF), super-lattice extrinsic (SESF), and complex extrinsic (CESF) faults. Furthermore the cutting displacement of the precipitate is recorded. With this new approach, the classical cutting/bowing behavior is investigated as a function of alloying concentration, precipitate spacing, precipitate shape, and loading direction. In addition, dislocation build up due to precipitate pinning is simulated and used to propose a dislocation density modification to the order strengthening equation. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |