Abstract
The structural dynamics during tensile deformation of rhodium (Rh) nanocontacts (NCs) at room temperature was observed by in situ high-resolution transmission electron microscopy. The critical shear stress for a {111}-(110) slip system was estimated from simultaneous measurement of the force acting on the NCs. It was found that the critical shear stress increased to ~5 GPa, which was comparable with that for a homogeneous slip, as the minimum cross-sectional width of the NCs decreased to less than 1.6 nm. This result implies that the slip mechanism in Rh transformed from dislocation-mediated slip to homogeneous slip when the width decreased to less than the critical size.
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