Abstract
In this study, the hydrogen evolution behavior in T6-tempered 7075 aluminum alloys was detected by means of a testing machine equipped with a quadrupole mass spectrometer installed in an ultra-high vacuum chamber. It is clarified that the hydrogen evolution started at the stage of elastic deformation. In addition, the higher amount of hydrogen was evolved at the beginning of plastic deformation. This indicates that primarily dissolved hydrogen was transported to the surface of specimen with the aid of mobile dislocations. Furthermore, in order to introduce hydrogen from the atmosphere, the 7075 alloys were pre-deformed by a slow strain rate testing (SSRT) in a humid air atmosphere with a relative humidity of 90%. It was shown that the amount of hydrogen evolved during deformation and fracture in the hydrogen charged alloys was much higher than in the no hydrogen charged alloys.
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