613 6000系アルミニウム合金中の水素挙動に及ぼす引張変形の影響(材料と組織,オーガナイズドセッション)

概要

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The 6061 aluminum alloys are being used as a liner material of a high-pressure hydrogen tank for the fuel cell vehicles but instead an alloy with higher strength is needed. Therefore, aluminum alloys such as 6066 and 6069 having higher strength than 6061 are regarded as a candidate. For the application to the tank, the safety of the liner material in the high-pressure hydrogen gas must be guaranteed. A slow-strain-rate technique (SSRT) tensile test in a moist air was proposed as a convenient accelerated test to access the resistance to hydrogen embrittlement, while thermal desorption spectroscopy (TDS) is regarded as an effective examination method to measure the hydrogen content as well as to pressure its location. In this study the resistance to hydrogen embrittlement was assessed for three 6000 series alloys having higher strength than 6061 together with a 6061 by means of the proposed testing method. Furthermore, TDS study was carried out to investigate the behavior of hydrogen that may intrude the specimen during the SSRT deformation in the moist air. From the results of TDS, it is presumed that the SSRT deformation allows some hydrogen atoms in the specimen to be trapped by dislocations, and internal hydrogen to be emitted to outside through a motion with dislocations while environmental hydrogen to intrude the specimen when deformed in the moist air.
社団法人日本機械学会の論文
2008-09-12