Archives—November 2008

Modeling and Simulation of Microstructure Evolution in Crystalline Solids

Friday, November 14, 2008 3:00 – 4:00 pm
Room 610, M&M Building

Dr. Yongmei M. Jin
Department of Aerospace Engineering, Texas A&M University
3141 TAMU College Station, TX 77843-3141

Abstract

This talk will present materials modeling and computer simulation studies ofmicrostructure evolutions in response to external thermal, mechanical andmagnetic stimuli during processing and service in various crystalline solids, with aspecial focus on structural and functional metal alloys. The theoreticalmethodology (phase field model) is based on gradient thermodynamics ofheterogeneous materials, microstructure-dependent free energies ofmicroelasticity and micromagnetism, and semi-phenomenological kinetics ofmicrostructure evolution. Particular examples will be discussed: (1) developmentof compositional and structural domains during decomposition, ordering transition,and martensitic transformation; (2) effects of crystallographic microstructures onmagnetic and mechanical properties in advanced magnetic materials includinghard ferromagnets, magnetostrictive materials, and magnetic shape memoryalloys; and (3) roles of long-range dipole-dipole interactions and evolution kineticpathways in domain microstructure processes and material properties.Connections between mesoscale phase field modeling, atomistic (first principles,molecular dynamics) and continuum (finite element) simulations, thermodynamicand kinetic databases, as well as experiments will also be addressed.

Biography

Dr. Jin received B.E. and M.E. in Mechanical Engineering from University of Science and Technology of China in 1994 and 1997, respectively, and Ph.D. in Materials Science and Engineering from Rutgers University in2003. After two years of postdoctoral research at Rutgers University, she joined the Department of AerospaceEngineering at Texas A&M University in 2005 as an Assistant Professor. Her research interest focuses on materialsmodeling and computer simulation. In particular, she has been working on the development and application ofphase field models to investigate microstructure evolutions in crystalline materials during various physicalprocesses, e.g., martensitic transformation, decomposition, ordering transition, ferromagnetic domain switching,magnetomechanical behaviors, and defect evolutions (dislocations, cracks, voids, and free surfaces) in single- andpoly-crystalline bulk and thin film materials.