| Abstract Scope |
Dislocation/grain boundary interactions are central to dictating the strength and failure modes of metals and alloys under a wide range of loading conditions. While geometric factors such as slip alignment has been shown to affect the likelihood of slip transmission across a boundary, their influence, along with the influence of slip planarity, on dislocation pileup behavior and the local stress evolution is less clear. In this study, we combine in situ loading of Al, Ni, and stainless steel in the scanning electron microscope with high resolution electron backscatter diffraction analysis to measure the evolution of the stress fields associated with dislocation/grain boundary interactions as a function of applied load. A wide variety of grain boundaries, including coherent and incoherent twin boundaries, were investigated. Results will be discussed in terms of the influence of stacking fault energy and slip planarity on the importance of geometric parameters in dictating dislocation/grain boundary interactions. |