Understanding materials behavior at mesoscale using phase-field and phase-field-crystal models

Seminars
28.01.2018
14:30
David Wang Auditorium, 3rd floor Dalia Maydan Bldg.
Dr. Nan Wang

Dr. Nan Wang

Department of Physics, McGill University
Montreal, QC Canada H3A 2T8

 

Many interesting materials behaviors that are important to macroscopic functionality begin to manifest not at atomic or nanoscale but mesoscale. Complex interactions between defects, interfaces and various non-equilibrium structures have been exploited to improve materials performance and realize new functionalities.

Theoretical and computational understanding of mesoscale materials behavior received increasing attention in the last decade. Phase-field and phase-field-crystal methods emerged in the last two decades are well-known for their capability in solving mesoscale computational materials science problems.

In this talk, I will give a brief introduction of phase-field and phase-field-crystal methods, and demonstrate how they can help us to understand mesoscale materials behavior. I will start with a traditional topic of alloy strengthening and discuss a new two-mode theory of grain-boundary precipitate interaction that is validated using a phase-field-crystal model.

In the second example; I will show the formulation and validation of a new phase-field model for Vapor-Liquid-Solid nanowire growth. The last topic is about electromigration in metal interconnects.
I will present a recently developed phase-field-crystal model that bridges our knowledge of electromigration on electron level and continuum scale.