Abstract
In recent years, fuel cell vehicles are attracting attention as a solution of environmental problems.The6061 aluminum alloy is used as the liner of a type-3 hydrogen tank, which is surrounded by CFRP. Higher-strength aluminum alloy has been developed to reduce the amount of CFRP. However, we must pay attention to hydrogen embrittlement (HE) when we apply the higher-strength aluminum alloy to the liner. The HE is observed 7075-T6 alloy when the specimen is examined in humid air by means of slow strain rate technique (SSRT) tensile test. The HE process is reported as follows: micro-cracks originate at second-phase particles on the specimen surface and then become intergranular cracking. The HE process of 6000 series aluminum alloy has not been reported yet. Therefore, in this study, we have investigated relationship hydrogen embrittlement cracking and second-phase particles by means of SSRT tensile tests in humid air and dry nitrogen gas.
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