Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1561104 | Computational Materials Science | 2013 | 8 Pages |
Abstract
In order to fully capture dislocation cutting the precipitate (γⲠphase) in the nickel-based single crystal superalloy servicing in a wide range of temperatures, the superlattice intrinsic stacking fault (SISF) dissociation scheme is introduced into the three-dimensional discrete dislocation dynamics (3D-DDD) simulation framework by employing a total energy-based criterion for the transition from anti-phase boundary (APB) dissociation scheme to SISF one. The computational results show that the present 3D-DDD extension can successfully capture two key stages of the transition from APB to SISF dissociation. This extended 3D-DDD framework is also used to predict the overall stress-strain response of nickel-based single crystal superalloys at two typical temperatures 293 K and 873 K. Compared with the stress-strain curves predicted by the 3D-DDD framework only with consideration of APB dissociation scheme, the results by this extended 3D-DDD framework with consideration of both SISF and APB dissociations are closer to experimental data.
Related Topics
Physical Sciences and Engineering
Engineering
Computational Mechanics
Authors
Hui Yang, Zhenhuan Li, Minsheng Huang,