"Phase-field chemomechanical modeling of dislocation interaction with precipitates and solutes in metallic alloys"

Dear All,

Mathematics, Mechanics, and Materials Unit (Fried Unit) would like to invite you to a Seminar by Prof. Bob Svendsen, RWTH Aachen University.

Date: Tuesday, November 6, 2018
Time: 14:00-15:00
Venue: C015, Level C, Lab1

Speaker:
Bob Svendsen
Professor of Material Mechanics, RWTH Aachen University, Germany

Title: Phase-field chemomechanical modeling of dislocation interaction with precipitates and solutes in metallic alloys

Abstract:
The purpose of the current work is the development and application of continuum thermodynamic models for the effect of solute chemistry and segregation on dislocation-mediated deformation in metallic alloy systems at the nanoscopic scale. Examples of such systems include two-phase γ-γ0 nickel-based superalloys or two-phase γ-κ high maganese lightweight steels. Model development is carried out in the framework of a recent phase-field-based approach to the formulation
of chemomechanics for multiphase, multicomponent solid systems. In this framework, models for dislocation-solute and -microstructure interaction build in particular on ab initio- and atomistics-based Peierls-Nabarro and phase-field models for nanoscopic dislocation processes (e.g., dissociation, core and stacking fault formation) in single-element fcc materials. Basic aspects of the extension and generalization of these models to multicomponent, multiphase alloy systems will be discussed, e.g., the effect of solutes on the (generalized) stacking fault energy. In addition, initial simulation results for dislocation-precipitate interaction in Ni-Al alloys will be presented and compared with analogous MD
simulation results as well as with related previous work. If time permits, preliminary results for the Ni-Al-Co system will also be discussed.

*Please see the attachment for more detail.