環境水素の影響を受けた6061および7075アルミニウム合金の衝撃引張特性

概要

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Impact tensile properties of T6-aged 6061 and 7075 aluminum alloys affected by atmospheric hydrogen were investigated. In order to introduce hydrogen from the atmosphere, the alloys were pre-deformed by a slow strain rate testing (SSRT) in a humid air atmosphere with a relative humidity of 90%. For the pre-deformed specimens, the impact tensile tests were performed using split Hopkinson pressure bar (SHPB) method at an average strain rate of 5.0×10^2s^<-1>. Hydrogen concentration after the pre-deformation by SSRT was measured with a thermal desorption analysis. As a set of the experiments, it was shown that the ductility in the impact test decreased when the T6-aged 7075 alloys were hydrogen charged. The hydrogen embrittlement sensitivity of the T6-aged 6061 alloys was lower than that of the T6-aged 7075 alloys. The decrease of the ductility due to hydrogen charging of the T6-aged 7075 alloys was closely related to the increase in the ratio of the intergranular fracture near the specimen surface.
社団法人日本機械学会の論文
2009-11-25