多面体構造形成過程のフェーズフィールドシミュレーション

抄録

Polyhedral-structure formation process was simulated using a phase field model. A three-dimensional multi-phase field model was applied. Nuclei were set on geometrically regular points and the growth process was simulated by numerically solving the phase field equations. A regular structure consisting of truncated octahedral cells, well-known as a Kelvin cell, were obtained when the nuclei were set on body-center-cubic points, and rhombic-dodecahedral structure was obtained for fcc nuclei. Additionally, nuclei were set on the conjugate points of fcc lattice. A structure with a combination of regular octahedra and regular tetrahedra were generated, while rectangular face appeared on the four edges of the tetrahedra. The former two structures based on bcc and fcc arrangements were stable, while the latter structure by fcc conjugate were instable and transformed to cubic cells finally.