|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Computational Methods for Spatio-temporal Scale-bridging: from Atomistics to Mesoscale
||Concurrent Atomistic-continuum Simulations of Sequential Slip Transfer of Curved Dislocations across Grain Boundaries
||Shuozhi Xu, Liming Xiong, Youping Chen, David McDowell
|On-Site Speaker (Planned)
Sequential slip transfer across grain boundaries (GB) plays an important role in size-dependent propagation of plastic deformation in polycrystalline metals. For example, the Hall-Petch effect, which states that a smaller average grain size results in a higher yield stress, can be rationalized by dislocation pile-ups against an GBs. The process is inherently multiscale since both the atomic structure of the GBs and the long range fields come into play. In this work, concurrent atomistic-continuum (CAC) simulations are performed to study sequential impingement of edge or screw dislocations from a given pile-up on GBs in FCC metals. Results suggest the viability of using the CAC method to describe the interface reactions with fully-resolved atomistics while preserving the net Burgers vector and associated long range stress fields of curved dislocations of mixed character. The reactions between different dislocation characters and GB structures are elucidated.
||Planned: A print-only volume