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The boundary-dependent capability of grain-boundary sliding for various [001] twist boundaries in Cu has been systematically examined below 573K. The sliding has been detected by observing the rotation of moire fringes on boundary bcc Fe-Co particles in an aged Cu-Fe-Co alloy. The magnitude of sliding is not more than 1 nm. The activation energy Q and pre-exponential factor eta0 of boundary viscosity against misorientation angle curves show several cusps and these curves are analogous to the boundary energy against misorientation curve. A lower-energy boundary has a higher viscosity with a larger value of Q and a smaller value of η0.
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Monzen et al. (1996) studied this question.
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