|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Quantifying the Dislocation Emission Process from Grain Boundaries with Traction Fields
||Huck Beng Chew, Ruizhi Li
|On-Site Speaker (Planned)
||Huck Beng Chew
Grain boundaries are potential sites for dislocation emission in nanocrystalline materials. Understanding how the atomic structure of a grain boundary controls its ability to emit dislocations is a significant step towards engineering the grain boundaries of these metals. Here, we propose the notion of continuum-equivalent traction-fields as local quantitative descriptors of the grain boundary interface. From continuum-equivalent traction-fields along <110> symmetrical-tilt nickel grain boundaries, we successfully predict the critical stresses to trigger dislocation emissions. We show that Shockley partials are emitted when the grain boundary tractions, in combination with external tensile loading, generate a resolved shear stress to cause dislocation slip in the specific slip systems. Finally, we will discuss the relationship between the local grain boundary tractions and the grain boundary energy.