A low-angle tilt boundary was easily sheared by dislocations identical to those constituting the boundary. This shear results in the creation of semi-infinite low-angle tilt boundaries, which generate a stress at their tips large enough to cause fracture.

Stress Concentration and Crack Nucleation at the End of a Low-Angle Tilt Boundary. G.Saada: Philosophical Magazine Letters, 2005, 85[9], 481-90