Study of Hydrogen-Induced Plastic Damage Response of 7085-T7651 High-Strength Aluminum Alloy

Abstract

The hydrogen-induced plastic loss behavior of titanium alloys is often reported, but there are relatively few studies on high-strength aluminum alloys. In this article, the hydrogen-induced plastic damage behavior of 7085-T7651 high-strength aluminum alloy was investigated using a tensile specimen with pre-charging hydrogen, and the microstructure was characterized by transmission electron microscopy, scanning electron microscopy and time-of-flight secondary ion mass spectrometry. The results showed that 7085-T7651 high-strength aluminum alloy material has certain hydrogen embrittlement sensitivities, and with the increase of hydrogen-charging time, the hydrogen content and sensitivity of the material increases significantly. For the first time, the theoretical analysis and intuitive quantitative characterization of the hydrogen-induced plastic loss behavior mechanism on 7085-T7651 high-strength aluminum alloy is stated as the formation of Mg and H segregation formed at the crystal boundary, which will result in the weakening of the crystal boundary.