Molecular Dynamics Simulation of Effects of Lattice Orientation on Crack Propagation in Alpha-Iron when the Primary Slip Direction is in the Plane of Tensile Stress

概要

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Molecular dynamics simulation was performed on bcc α-iron having two different lattice orientations which both included a primary slip direction <111> in the plane of applied tensile stress. Cracks on the (100) and on the (011^^-) plane with crack growth-edge direction [011] were studied. For cracks on the (100) plane, no nucleation of dislocations was observed, and the cracks propagated in both low- and high-temperature environments. For those on the (011^^-) plane, brittle fractures without nucleation of dislocations occurred at low-temperature, but at high-temperature nucleation of [111] dislocation from the crack tip was observed. Local stress on the cleavage plane and on the slip plane are discussed from the viewpoint of the fracture mechanism.
一般社団法人日本機械学会の論文
1996-07-15