About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Phase-field Model of Precipitation Processes with Spontaneous Coherency Loss |
Author(s) |
Tianle Cheng, Youhai Wen |
On-Site Speaker (Planned) |
Tianle Cheng |
Abstract Scope |
Coherency loss (CL) is a common process for precipitates during growth and Ostwald ripening. Existing models in the literature, however, treat all precipitates as either coherent or incoherent, without capturing the spontaneous process of CL or coupling CL with microstructure evolution. A phase-field model is proposed in which a special field variable is employed to describe the degree of coherency loss of each particle and its evolution is governed by a Ginzburg-Landau type kinetic equation. For the sake of computational efficiency, a flood-fill algorithm is introduced that allows the model to efficiently simulate coarsening of a large number of particles coupled with CL. The model is applied to simulate coarsening of Al3Sc precipitates in aluminum alloy and comprehensively compared with experiments. Simulation results clearly show how the particle size distribution is changed during CL and affects the coarsening rate. |
Proceedings Inclusion? |
Planned: |