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Abstract
In nanocrystalline (nc) materials, the misfit of lattice structures at the junctions of grain boundaries (GBs) generally increases local stresses that can be released by GB sliding. In this article, the sliding behaviors of the ordered Σ = 3 (111) GB (twin) and Σ = 11(113)
GB in nc palladium have been investigated by means of high-resolution transmission electron microscopy observations and molecular statics calculations. It is found that the twin boundary (TB) can release either large stresses by sliding with a DSC-lattice vector of 1/6
or small stresses by sliding over an imperfect vector. The observed Σ = 11 GB image is exactly symmetrical from which we can clearly identify no GB sliding along the [332] direction, but we cannot determine a sliding component along the
direction. The image simulations indicate that the latter is experimentally unidentifiable.
Acknowledgements
The work is supported by the Natural Science Foundation of China (NSFC) (Nos 50471080 and 50571100) and National Basic Research Program of China (No. 2006CB605103).