Phase-Field Modeling of Microstructure Evolution in the Presence of Bubble During Solidification

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 51; no. 3; pp. 1023 - 1037
• Main Authors: Zhang, Ang, Du, Jinglian, Zhang, Xiaopeng, Guo, Zhipeng, Wang, Qigui, Xiong, Shoumei
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-03-2020; Springer Nature B.V
• Subjects: 5th World Congress on Integrated Computational Materials Engineering; Adaptive algorithms; Alloy solidification; Arrays; Bubbles; Characterization and Evaluation of Materials; Chemistry and Materials Science; Computer simulation; Dendritic structure; Density ratio; Entrapment; Evolution; Finite element method; Gas density; Materials Science; Metallic Materials; Morphology; Nanotechnology; Solidification; Solids; Structural Materials; Surfaces and Interfaces; Thin Films
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-019-05593-3

Simulation of the solid–liquid–gas interaction during solidification is challenging due to the presence of complex phase interfaces, bubble deformation, and high liquid/gas density ratio. In this work, a hybrid phase-field lattice-Boltzmann (PFLB) approach, together with a parallel and adaptive-mesh-refinement (Para-AMR) algorithm, is developed to model interactions between the gas bubble and solid growth front during solidification. The solid growth and bubble evolution are solved by the phase-field method. Both melt flow and bubble movement are determined by a kinetic-based lattice-Boltzmann model. Bubble dynamics during alloy solidification is modeled and compared with experiments, and a good agreement is achieved for various solid/liquid interfaces including planar, cellular, and dendritic interfaces. Results show that the effect of the bubble on solid array is dependent on the solid/liquid interface morphology, bubble size, and relative position between the bubble center and dendritic tip. Two interaction mechanisms, including engulfment and entrapment, are compared, and the difference is caused mainly by the redistribution of solute. The interaction mechanism between the rising multibubbles with large deformation and the dendritic array is also discussed.