Abstract
So far, 6061 aluminum alloy has been being used as a liner material of high-pressure hydrogen containers for fuel cell vehicles, while higher-strength alloy is being demanded to increase the maximum fill pressure with a minimum increase in cost and weight. In this study, aluminum alloy plates of 6061 and 7075 both T6-tempered are subjected to fatigue test in air and heavy-water-vapor atmosphere at 303K with relative humidity of 90% (HWA). The amount of deuterium in front of the crack tip is measured by means of thermal desorption spectroscopy, and the effect of hydrogen on the fatigue crack propagation is discussed based on the results obtained. It was found that crack propagation rate of aluminum alloys was little affected by external environmental hydrogen in HWA. Deuterium was detected in front of the crack tip, which means that hydrogen is introduced into the aluminum alloys from humid environment during the crack propagation.
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