Regensburg 2010 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 53: Nanostructured Materials IV

MM 53.1: Talk

Thursday, March 25, 2010, 14:00–14:15, H16

Strain in the nanograin — •Harald Rösner and Gerhard Wilde — Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany

Strain in an individual deformation-twinned nanocrystalline Pd grain of about 24 nm size was mapped. The in-plane components of the strain tensor were calculated and charted using geometric phase analysis based on an individual high-resolution transmission electron microscopy image. Considerable shear strain was accumulated along the twin boundaries. The twins and matrix were significantly distorted relative to each other (rotated by about 3° on average) and showed a strong gradient across the grain running parallel to the twin lamellae. An estimate of the strain energy stored in the Pd grain yielded a value of E = 6.495 J/g. Based on the strain distribution observed, a temporal deformation scenario is discussed.