(Lecture, Jan 9) Introduction to Phase-Field Method and Its Applications to Modeling Materials Microstructures and Properties
time: 2018-01-08

Topic: Introduction to Phase-Field Method and Its Applications to Modeling Materials Microstructures and Properties
Speaker: Prof. Longqing Chen, Pennsylvania State University
Time: 15:00, Jan 9, 2018
Venue: Room 205, Building 14, Wushan Campus
Abstract:

I will present two projects.  First, I will present our work around helical polypeptides.
The core of materials research is the study and manipulation of the spatial and temporal evolution of structural, magnetic, electric polarization, charge, and chemical domains as well as their responses to changes in environmental conditions. This presentation will introduce the phase-field method to model and predict the formation and evolution of hierarchical mesoscale microstructures structures and properties under different mechanical and electric stimuli. In the phase-field method, the mesoscale microstructure of a material is described by a set of continuum fields such as spatial distributions of atomic density, chemical composition, long-range atomic order, crystallinity, and ferroic order. It can handle arbitrarily complex spatial distributions of structure, composition, and order parameters and is able to take into account the interfacial and defect energies as well as the long-range electrostatic, magnetic, and elastic interactions within a mesoscale microstructure. It has been successfully applied to modeling and predicting ferroic phase transitions and domain formation, solidification, grain growth, particle coarsening, electrochemical processes, dislocation dynamics, fracture, and biological cells. Representative examples will be provided to demonstrate the use of the phase-field method to help interpreting experimental observations as well as to provide guidance to achieve desirable mesoscale microstructures and thus properties in a number of materials systems.