623 高力 Al 合金の動的応力下における環境ぜい化き裂進展の AFM その場観察

概要

論文の詳細を見る
The fatigue crack, as well as the environmentally induced crack including static stress corrosion (SC), dynamic SC and cyclic SC cracks in a high-strength Al-Zn-Mg alloy, 7075-T651,were observed using the AFM system that enabled the in-situ nanoscopic observation of environmentally induced damage in a controlled environment under dynamic loading conditions. The dynamic SC crack grew at a constant growth rate, while the static SC crack grew in an unsteady manner with blunting and re-sharpening of the crack tip. Using the AFM topographic data, crack tip opening displacement (CTOD) and mode III displacement of a crack were measured. Larger mode III displacements were observed in fatigue and cyclic SC cracks than in static and dynamic SC cracks. The static SC crack had a larger scatter of CTOD than other cracks.
社団法人日本機械学会の論文