HYDROGEN DEPTH-PROFILING AND DESORPTION KINETICS IN RAPIDLY SOLIDIFIED Al-Fe ALLOYS

摘要

Hydrogen surface segregation and trapping in rapidly solidified Al-0.2; 0.5 at% Fe alloys has been studied through elastic recoil detection technique, Rutherford backscattering spectroscopy and thermal desorption spectroscopy. It was detected that most hydrogen was localized in the subsurface regions (400 nm) and estimated to be 3.6 at% in Al-0.2 Fe alloy. Strong hydrogen segregation on air-side surface in alloy showed increase in its content up to 9.6 at% after heat treatment at 500°C. Our results indicated that solute-vacancy interactions and microstructural features affect hydrogen behaviour in Al-Fe alloys. The hydrogen trapping at iron atoms in the substitutional sites was concluded to be predominant.