Abstract
Crack formation in a nickel bicrystal wire of radius 16 nm with a negative junction disclination lying along the axis has been studied by computer simulation. It has been revealed that at a disclination strength exceeding some critical value (approximately 17°), a crack is formed in the region of the disclination core; the crack represents an asymmetric two-sided wedge elongated along the grain boundary. The equilibrium length of the crack increases with increasing disclination strength. Disclinations with a strength that is less than critical can exist in nanocrystals obtained by compacting nanopowders and control their properties to a significant extent.
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