Dynamic behavior of grain boundaries with misorientations in the vicinity of Σ3 coherent and incoherent twin boundaries in Al bicrystals

Isothermal and thermomechanical fatigue crack growth behavior of 316LN stainless steel under load‐ and strain‐controlled modes

“…Σ3 grain boundaries, classified as low-sigma grain boundaries, exhibit a robust inhibitory effect on crack initiation and propagation. [50][51][52] Upon impact with this grain boundary, the crack undergoes significant deflection at a sharp angle and extends along the Σ3 grain boundary. This illustrates how, even when the crack lies within a uniform grain, its behavior can be significantly influenced by the pronounced angular change in orientation of the other plane, as observed in the plane of Figure 15C, leading to crack deflection within the grain.…”

Effects of Grain Boundary Misorientation Angle on the Mechanical Behavior of Al Bicrystals

“…In order to simulate the interaction between an atomistic defect within a grain and a GB with a determined misorientation angle, some computational methods have successfully been utilized [16,17]. Molecular dynamics (MD) simulations are widely used to study the tensile response, deformation mechanisms and crack propagation of nanocrystalline materials [16,[18][19][20][21][22]. Using MD, it has been found that the accumulation of dislocations at the crack tip reduces the crack propagation [19].…”