Molecular dynamics studies of the interaction of a/6 ⟨112⟩ Shockley dislocations with stacking fault tetrahedra in copper. Part I: Intersection of SFT by an isolated Shockley

The interactions of Shockley dislocations with stacking fault tetrahedra (SFTs) formed during twinning deformation in fcc crystals have been studied by molecular dynamics using a copper potential. The fundamental mechanisms by which a moving Shockley dislocation interacts with a SFT involve shearing the apex, formation of a residual loop around the SFT and reactions with dislocations at the tetrahedron base. The latter reactions are critical to …