3D characterisation of microstructure around a crack tip by combining high-voltage electron microscopy and tomography.

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Three-dimensional structures of crack tip dislocations were observed, using electron tomography with a high-voltage electron microscope. It was calculated that the effect of elastic stress field due to the dislocations on the local stress field around the crack tip. It was elucidated that crack opening stress is applied at a part of the crack front, which becomes a new dislocation source. It was also elucidated that a certain dislocation double cross-slips ahead of the crack tip to be a Frank-Read source.