|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||A Concurrent Atomistic-continuum Study of Sequential Slip Transfer of Curved Dislocations across Grain Boundaries
||Shuozhi Xu, David L McDowell, Liming Xiong, Youping Chen
|On-Site Speaker (Planned)
||David L McDowell
Sequential slip transfer across grain boundaries (GB) plays an important role in grain size- and grain boundary character-dependent plastic deformation in polycrystalline metals. Slip transfer is inherently multiscale since both the atomic scale structure of the interface and the long range fields of dislocation pile-ups come into play. In this work, large scale concurrent atomistic-continuum (CAC) simulations are performed to address the slip transfer of dislocation pile-ups across symmetric and asymmetric tilt GBs (CSL and more general) in fcc Ni. The CAC method is able to describe the interface reactions with fully-resolved atomistics while preserving the net Burgers vector and associated long range stress fields of curved dislocations. Emphasis is placed in exploring the role of specific GB structures and dislocation character in interface absorption-desorption reactions, including evolution of the structure of the interface through multiple dislocation reactions.