|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Design and Simulation of Materials (CDSM 2018): Meso/Macroscale Simulations
||Phase-field Simulation of Nodule Microstructure near Grain Boundaries in Nickel-based Alloys
||Yuhki Tsukada, Ryota Oshima, Toshiyuki Koyama, Mitsuharu Yonemura
|On-Site Speaker (Planned)
Ni-based alloys are strengthened by the γ′ phase precipitated in the γ matrix phase. During the high temperature creep of model alloys with a base composition of Ni-20mass%Cr, the γ′ phase near grain boundaries coarsens in association with the grain boundary migration and nodules of γ′ phase are formed. It is necessary to control the microstructure near grain boundaries for improving the creep properties of Ni-based alloys. In this study, the effects of grain boundary mobility, grain boundary diffusion and dislocation density on the formation of nodule microstructure are simulated by the phase-field simulations. It is shown that the nodule microstructure tends to be formed when the grain boundary diffusion coefficient is large and the grain boundary mobility is small. Furthermore, it is shown that the dislocation density difference between neighboring grains, which drives the grain boundary migration, has a significant effect on the formation of nodule microstructure.
||Planned: Supplemental Proceedings volume