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Meeting Materials Science & Technology 2020
Symposium Interfaces and Phase Transformations
Presentation Title A Phase Field Dislocation Dynamics Model in Heterogeneous Crystalline Media
Author(s) Shuozhi Xu, Irene Beyerlein
On-Site Speaker (Planned) Shuozhi Xu
Abstract Scope Understanding dislocation dynamics in heterogeneous crystalline media necessitates modeling of plastic deformation in the vicinity of traction-free surfaces and interfaces. For example, in metals, voids, grain boundaries, and bimetal interfaces can impede dislocation gliding and hence contribute to strain hardening. While the atomistic simulation method is desirable in modeling dislocation dynamics in these cases, the simulation cells are usually at the nano-scale due to the high computational cost. Here, we develop a phase-field dislocation dynamics (PFDD) model that takes into account free surfaces and interfaces by employing Eshelby’s equivalent inclusion method. In this model, the heterogeneities with a general geometry and plastic deformation on general slip planes progress hand in hand. We use the PFDD model to study static dislocations in adjacent to surfaces/interfaces as well as slip interactions between dislocation and voids/interfaces. Simulation results are benchmarked against atomistic simulations and analytical solutions.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Phase Field Dislocation Dynamics Model in Heterogeneous Crystalline Media
Computing the Free Energy and Mobility of Cylindrical Interfaces
Localized Phase Transformation at Interfaces – A New Alloy Design Strategy
Microstructure and Mechanical Properties of Pre-aged Thermo-Mechanically Processed NiTiHf Shape Memory Alloy
Phase Transformations in High-Temperature Industrial Applications: An Experimental and Computational Study of Nitridation in Commercial Austenitic Stainless Steel
Refining Alpha Microstructure via Dual-phase Interface and Twin Boundary in Beta Titanium Alloys
Shear-mediated Interfacial Structure Evolution in Nanoscale FCC Gold
Study of Strain Rate and Temperature Dependent Behavior of Pseudo-morphic bcc Mg within the Mg/Nb Nanocomposites

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