α鉄のき裂進展の分子動力学シミュレーションにおける格子方位の影響 : 主要すべり方向を面内に含む場合

概要

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Molecular dynamics simulation is performed on α-iron having two kinds of lattice orientations including the primary slip direction of [111] for bcc crystal. The crack on the (100) plane with crack tip direction [011] and that on the (011) plane with crack tip direction [011] are studied. For the crack on the (100) plane with its tip direction [011], no dislocation emission is observed, and the crack propagates on the (100) plane in both low-and high-temperature environments. For the crack on the (011) plane with its tip direction [011], brittle fracture without dislocation emission occurs at low temperature, but at high temperature [111] dislocation emission from crack tip is observed. The local stress on the cleavage plane and the slip plane is discussed from the viewpoint of fracture mechanism.
1995-06-25