P81 Al-Mg-Si系合金の変形に伴う水素集積の可視化(水素,ポスター講演3)

概要

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It is reported that there is a possibility of hydrogen embrittlement caused by the reaction between H_2O in air and aluminum alloy deformed at a slow strain rate(10^<-7>s^<-1>). In this paper, hydrogen accumulation during tensile and bending deformation of Al-Mg-Si base alloys was examined by means of Hydrogen Microprint Technique(HMT) in order to visualize hydrogen. The result of tensile test showed that both 0.2% proof stress and tensile strength decreased as the cooling rate during quenching in solution treatment decreased. As the grain size becomes small, both 0.2% proof stress and tensile strength also increased. Observation of microstructure showed that an A8 specimen where the cooling rate is 20℃/s fractured preferentially at the grain boundary, while an A8 specimen quenched in water indicated ductile fracture. The same tendency was observed between the tensile test and the bending test. Hydrogen was accumulated at slip lines near the fracture area.
一般社団法人日本機械学会の論文
2005-11-03