多数の粒を考慮した核生成現象に対するKWC形Phase-fieldモデルの構築とそのシミュレーション

抄録

Phase-field models are widely used to numerically reproduce the evolution of microstructure. Among them, Kobayashi-Warren-Carter (KWC) phase-field model are frequently used to analysis of microstructure formation with crystal rotation. However, this model cannot simultaneously express the evolutions of phase state and crystal orientation of each grain since it uses only one order parameter and one orientation parameter to express phase state continuously distributed over the analysis area. In the present report, we extend KWC model by introducing interface field in reference to multi-phase-field (MPF) model to handle a large number of grains. In addition, we perform an FDM analysis on a nucleation phenomenon from subgrains using this model and show its validity.