Abstract
Nanocrystalline Ru and Ru 80C 20 powders have been prepared by high-energy ball milling of elemental powders under a reactive methane atmosphere. The powders are investigated by x-ray diffraction and transmission electron microscopy. The deformation during milling results in a decrease of the grain size to 7 nm for elemental Ru and to 4 nm for Ru 80C 20. The results are compared to ball milling experiments on Ru under inert argon gas atmosphere. The influence of composition and milling atmosphere on the grain size refinement during milling are discussed with respect to the underlying mechanism of plastic deformation, coupled with solution hardening during milling and the role of solute segregation at grain boundaries.
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