Abstract
A fuel cell powered car using a clean energy attracts attention as a countermeasure to some environmental problems so that the fuel cell powered car uses hydrogen fuel and does not exhaust carbon dioxide and the nitrogen oxide. High pressure hydrogen storage container of fuel cell powered car is made by cylindrical aluminum alloy and given spinning processing at elevated temperature. Cracking due to hydrogen embrittlement and fatigue occur in the neck part of liner materials. This cracking is caused by defect of aluminum alloy during spinning processing at elevated temperature. However, there is not the investigation. In this study, tensile properties of 6066 and 6069 aluminum alloys at elevated temperature as container materials were investigated. From the result of this study, tensile strength at elevated temperature was decreased. These result were caused by recovery at elevated temperature of aluminum alloy.
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