|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Interface-driven Phenomena in Solids: Thermodynamics, Kinetics and Chemistry
||Atomic-Level Mechanisms of Grain Boundary Segregation and Embrittlement in Nickel-Sulfur
||Tao Hu, Shengfeng Yang, Naixie Zhou, Yuanyao Zhang, Jian Luo
|On-Site Speaker (Planned)
The atomic-level mechanisms of sulfur-induced grain boundary embrittlement of nickel have puzzled the materials science community for decades. Using aberration-corrected scanning transmission electron microscopy (AC STEM), we have directly imaged the atomic configuration of the general (low-symmetry, random) grain boundaries in sulfur-doped nickel at different equilibrium temperatures and sulfur activity, by combining both high-angle annular dark field (HAADF) and bright field (BF) imaging as well as electron energy loss spectroscopy (EELS). The microscopic observation was then compared with both statistical interfacial thermodynamic models and atomistic simulation using generic algorithms. The results are discussed in the framework of grain boundary complexion (coupled structural and adsorption) transitions.
||Planned: A print-only volume