605 湿潤大気中アルミニウム合金の水素脆化感受性に及ぼす試験片厚さの影響(材料と組織)

概要

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In late years, fuel cell vehicles(FCV)using hydrogen as the fuel are attracted attention in terms of the reduction or CO_2 emissions. In the FCV, the hydrogen gas is stored in carbon reinforced plastic tanks that are lined with aluminum. However, it is known that in some aluminum alloys hydrogen embrittlement(HE)occurs. In this study, effects of specimen thickness on the sensitivity to HE have been investigated by slow-strain-rate technique tensile test in moist air. In contrast to the data reported previously in a 6061 aluminum alloy, HE took places in a 7075 aluminum alloy stretched in moist air, depending on strain rate. The 7075 alloy with lm in thickness has higher sensitivity to HE than one with 5mm, in comparison of the elongation at same strain rate.
一般社団法人日本機械学会の論文
2006-09-14