Experimental and molecular dynamics investigation of a sessile dislocation core structure in Au

Abstract

ABSTRACTA novel type of sessile dislocation core structure and a 45° glissile dislocation are obtained in Au using high-resolution transmission electron microscopy. The formation mechanism of the sessile core structure is studied by molecular dynamics simulation. The 45° dislocation has a strong mobility on the {100} slip plane. Depending on the applied strain, two 45° dislocations with same sign screw components repelled each other; two 45° dislocations with screw components of opposite signs attract each other to form this type of sessile structure. Under a large applied strain, the sessile structure remained stable and motionless.