404 アルミニウム合金の延性に及ぼす水素の影響(関東支部茨城講演会)

概要

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In late years with worsening of the global environmental state, regulation of CO_2 emission has become more severe to suppress global warming. Therefore, fuel cell vehicles (FCV's) come into the limelight particularly in the automobile industry. It is suggested that the FCV's should be equipped with a tank with highly compressed hydrogen gas consisting of aluminum alloy liner materials. On the other hand, it is known that some aluminum alloys cause hydrogen embrittlement, when they are stretched in the humid atmosphere. Thus, in this study, slow-strain-rate technique tensile tests were carried out in the atmosphere where humidity was precisely controlled, and the effect of hydrogen on the ductility of various aluminum alloys was examined. As a result, in a 6061-T6 sheet, elongation did decrease at all when testing atmosphere was changed from dry nitrogen gas to humid air, irrespective of strain rate, that is, hydrogen embrittlement was not detected. For a 7075-T6 sheet, elongation falls significantly with the above change in the atmosphere as the strain rate decreases, which means that sensitivity to hydrogen embrittlement is high. In the 7075-T6, hydrogen generated at the alloy surface during the test was deduced to invade the interior of the material, to reduce the bonding strength of grain boundaries, and finally to cause hydrogen embrittlement based on intergranular fracture.
一般社団法人日本機械学会の論文
2005-09-08