Fig. 4: Bottom-up design of plastic reversibility in Au bicrystals with dislocation-type GB.
From: Metallic nanocrystals with low angle grain boundary for controllable plastic reversibility
a Au bicrystal consisting of an 18° \(\left[ {1\bar 10} \right]\) GB, with an inclination (α) of 25.3°. The inset shows the staggered configuration of the dissociated GB dislocations (b = 1/2[101]), as marked by the yellow and light blue concave rectangles. b GB-mediated shear deformation of the Au bicrystal under a strain rate of 6 × 10−3 s−1. c Deformation snapshot of the reversible deformation of another Au bicrystal with almost twice the aspect ratio (L/D) and near-identical θ and α compared with a. d GB-mediated reversible deformation of an Au bicrystal with the same 18° \(\left[ {1\bar 10} \right]\) GB as a under a higher strain rate of 6 × 10−1 s−1. e Schematic illustrating the bottom-up design protocol of metallic bicrystals to realize superior plastic reversibility. NC and NW represent nanocrystal and nanowire; T and C stands for uniaxial tension and compression; temp. is an abbreviate for temperature. Scale bars: 5 nm.
