302 疲労変形による転位構造の発達とその非破壊的観察

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Dislocation structures of fatigued copper single crystals and stainless steel polycrystals are nondestructively observed by electron channeling contrast imaging (ECCI) method. The ECCI method enables us to detect dislocations underlying near surface of a bulk crystal, using a scanning electron microscopes. Ladder-like dislocation patterns formed along primary slip planes are successfully observed in a single-slip-oriented copper single crystal by the ECCI method. Because this structure is almost same as observations with transmission electron microscope (TEM), it is said that the ECCI method can replace the conventional TEM observation at least in examining the dislocation structure of fatigued metals. Development of dislocation structure during fatigue is also investigated in one specimen of the stainless steel polycrystal.
社団法人日本機械学会の論文