601 熱処理の異なる7075アルミニウム合金の水素脆化(材料と組織)

概要

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In late years, fuel cell vehicles (FCV) using hydrogen as the fuel have been attracting attention in terms of the reduction or CO_2 emissions. In the FCV, the hydrogen gas is stored in tanks and are covered with carbon reinforced plastic. that are lined with aluminum. However, it is known that in some aluminum alloys hydrogen embrittlement (HE) occurs. In this study, sheet specimens of a 7075 aluminum alloy subjected to three heat-treatments, under-aged (UA), peak-aged (PA) and over-aged(OA), were tensile-tested in a moist air as well as dry nitrogen gas by slow-strain-rate technique(SSRT). In addition, effects of the behavior of hydrogen has been investigated by means of thermal desorption spectroscopy (TDS), hydrogen-emission have been monitored by TDS test. The result of SSRT tensile tests indicated that the sensitivity to HE was the highest and lowest in the UA and OA specimen, The UA specimen deformed by 7% in the moist air as well as that without deformation was subjected to the TDS test, and it was found that the amount of hydrogen was increased by the deformation.
一般社団法人日本機械学会の論文
2007-09-28