Abstract
In the present study, the hydrogen embrittlement (HE) and the hydrogen-assisted fracture (HAF) behaviors of electrochemically hydrogen-charged Al 8090 with different specimen orientations and aging practices were examined using smooth bar and single-edge notch (SEN) specimens. It was found that the cathodic hydrogen charging substantially reduced the tensile ductility and the resistance to fracture of Al 8090. The susceptibility to HE and HAF of Al 8090 was strongly dependent on specimen orientations and aging practices. Hydrogen attack was the most significant along the grain boundaries, and, consequently, T-S oriented SEN and T-oriented smooth-bar specimens showed the highest susceptibility among the orientations studied. The susceptibility to HE and HAF decreased from underaging (UA) temper to overaging (OA) temper. It is speculated that the formation and development of a precipitate-free zone (PFZ) along the grain boundaries, rather than the change in slip planarity with prolonged aging is responsible for the reduced susceptibility to HE and HAF. Further studies are, however, required to confirm this notion.
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