| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification Science VIII
|
| Presentation Title |
Phase Field Modeling of Biomineralization?
Microstructure Evolution in Mollusk Shells
|
| Author(s) |
Laszlo Granasy, Laszlo Ratkai, Tamas Pusztai |
| On-Site Speaker (Planned) |
Laszlo Granasy |
| Abstract Scope |
During biomineralization, complex hierarchically structured organo-mineral composites form. In a few cases, crystallization is controlled by the biological system via adjusting the composition of the mother phase. We explore the possibility that phase-field approaches developed for describing complex polycrystalline structures can be adapted to such biological crystallization processes. Microstructure evolution during the formation of shells of three mollusks (a bivalve: Unio pictorum, a cephalopod: Nautilus pompilius, and a gastropod: Haliotis asinina) are investigated. In these cases, electron microscopy reveals a common sequence of ultrastructures: globular, columnar (prismatic), and the layered nacreous domains, when moving inwards from the outer surface of the shell. We present a minimum model that captures several aspects of microstructure evolution in these cases. An orientation field based phase-field technique developed to model multigrain eutectic solidification is used. With appropriate choice of the model parameters microstructures resembling closely to the experimental ones can be obtained. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Biomaterials, Modeling and Simulation, Solidification |