3516 高湿度空気中におけるアルミニウム合金の低ひずみ速度試験応答(S20-4 水素環境での静的強度と破壊じん性,S20 材料強度特性に及ぼす水素の影響)

概要

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In order to evaluate the susceptibility to hydrogen embrittlement(HE) of aluminum alloys 6061-T6 and 7075-T6 as candidate materials for high pressure-hydrogen container liner, SSRT (slow strain-rate technique) tests under wet air with 90% relative humidity have been carried out in a range of strain rate 3.47×10^<-7>〜1.39×10^<-5>/s by using smooth-and notched-plate specimens. 7075-T6 showed a significant susceptibility to HE, resulting in intergranular fracture, while in contrast, 6061-T6 exhibited a superior resistance, accompanying rather a trend to enhanced plasticity. Difference in form of crack extension between smooth-and notched-specimens of 7075-T6 was found. The observation supports the HE process includes both effects of plastic deformation and hydrostatic stress gradient on hydrogen transport.
社団法人日本機械学会の論文
2006-09-15