411 7075アルミニウム合金における水素の侵入挙動(OS4-(3)オーガナイズドセッション《材料と組織》)

概要

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In recent years, we are paying attention to clean energy because of environmental problems such as the global warming and the exhaustion of fossil fuels. As a way to solve these problems, fuel cell vehicles have been paid attention to because the fuel of the fuel cell vehicle is hydrogen that is one of the clean energy. In the fuel cell vehicles, high-pressure hydrogen gas is stored in a container consisting of aluminum liner and surrounding fiber-reinforced plastic layer. It is only 6061 aluminum alloy that is authorized as a liner aluminum material at present. Since reduction both in the weight and cost is required for the popularization of the fuel cell vehicles, the use of higher-strength aluminum alloy is considered. However, it is known that high-strength metallic materials are prone to suffer from hydrogen embrittlement, the mechanism of which has not been well elucidated yet. For a fundamental understanding of the mechanism of hydrogen embrittlement in high-strength aluminum alloy, in the present study, the behavior of hydrogen invading from the environment have been investigated in a 7075-T6 sheet by means of thermal desorption spectroscopy for specimens tensile-deformed at a low strain rate under air filled with heavy-water vapor. The obtained results have shown that hydrogen invades the specimen up to a deeper region when deformed then when just held in the same environment.
一般社団法人日本機械学会の論文
2010-08-27