Phase-Field Modeling of Microstructural Evolution by Freeze-Casting
Journal
Advanced Engineering Materials
Journal Volume
20
Journal Issue
3
Start Page
1700343
ISSN
14381656
15272648
Date Issued
2018
Author(s)
Huang, Tzuhsuan
Lin, Yangshan
Chang, Chihhsiang
Chen, Poyu
Chang, Shuwei
Chen, Chuin-Shan Shan David
Abstract
Freeze-casting has attracted great attention as a potential method for manufacturing bioinspired materials with excellent flexibility in microstructure control. The solidification of ice crystals in ceramic colloidal suspensions plays an important role during the dynamic process of freeze-casting. During solidification, the formation of a microstructure results in a dendritic pattern within the ice-template crystals, which determines the macroscopic properties of materials. In this paper, the authors propose a phase-field model that describes the crystallization in an ice template and the evolution of particles during anisotropic solidification. Under the assumption that ceramic particles represent mass flow, namely a concentration field, the authors derive a sharp-interface model and then transform the model into a continuous initial boundary value problem via the phase-field method. The adaptive finite-element technique and generalized single-step single-solve (GSSSS) time-integration method are employed to reduce computational cost and reconstruct microstructure details. The numerical results are compared with experimental results, which demonstrate good agreement. Finally, a microstructural morphology map is constructed to demonstrate the effect of different concentration fields and input cooling rates. The authors observe that at particle concentrations ranging between 25 and 30% and cooling rate lower than −5° min−1 generates the optimal dendrite structure in freeze casting process.
Subjects
Adaptive Finite Element Method
Bioinspired Material
Dendritic Microstructure
Freeze Casting Process
Gssss Time Integration Method
Phase-field Method
Boundary Value Problems
Casting
Ceramic Materials
Cooling
Crystal Microstructure
Ice
Initial Value Problems
Microstructure
Phase Interfaces
Phase Transitions
Solidification
Structural Optimization
Suspensions (fluids)
Thermoelectricity
Adaptive Finite Element Methods
Bio-inspired Materials
Dendritic Microstructure
Freeze Casting
Phase Field Methods
Time Integration Methods
Finite Element Method
Publisher
Wiley-VCH Verlag info@wiley-vch.de
Type
journal article