|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Segregation of Lead and Hydrogen Isotopes to Grain Boundaries in Nickel and Their Effect on Fracture
||Richard A. Karnesky, Samantha K. Lawrence, Khalid Hattar, Stephen M. Foiles, Brian P. Somerday
|On-Site Speaker (Planned)
||Richard A. Karnesky
Atom-probe tomographic measurements and atomistic calculations demonstrate the segregation of deuterium (D) and of lead (Pb) to grain boundaries in nickel (Ni), lowering grain boundary energy. The degree of segregation of each element depends strongly on the structure of the grain boundary; coherent Σ3 boundaries show essentially no segregation and higher Σ boundaries have enrichments of over ten from the bulk concentrations, for example. The combined segregation of Pb and D to grain boundaries in Ni-201 co-embrittles the alloy and changes the predominant mode of fracture from what is observed in material that lacks either or both of the segregants.