901 電子線トモグラフィーによる転位群の3次元観察(OS9.材料の組織・強度に関するマルチスケールアナリシス(1),オーガナイズドセッション)

概要

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Mechanical properties of crystalline materials highly depend on dislocation processes, Fracture toughness of materials is one of the most important phenomena strongly influenced by the dislocation process, where the most essential issue to be considered is the stress relief mechanism due to dislocations multiplied around a crack tip. Recently, applications of electron tomography into crystalline materials have drawn many attentions, which enable to clarify three-dimensional (3D) aspects of microstructural characteristics. For example, combination of electron tomography and dark-field TEM was applied to observe dislocations in three dimensions. In the present study, 3D analyses of crack-tip dislocations were attempted by combining scanning transmission electron microscopy and computed tomography (STEM-CT) in order to reveal 3D configuration of dislocations.
2009-10-10