First Direct In Situ Observation of Grain Boundary Sliding in Ultrafine Grained Noble Metal


  • This research was supported by the Deutsche Forschungsgemeinschaft (FOR 714). The nanocrystalline IGC Pd was produced by the group of Prof. Rainer Birringer (FR7.2 Experimentalphysik, Universität des Saarlandes).



The unambiguous experimental evidence that grain boundary sliding and shear banding are important mechanisms of plasticity in ultrafine-grained Pd with an average grain size of 134 nm was obtained using in situ scanning electron microscopy combined with orientation imaging techniques.