Hydrogen Embrittlement of Ordered Ni3Fe Alloy

The mechanical properties of ordered Ni3Fe alloy in gaseous hydrogen or simultaneously at hydrogen charging were investigated. The results show that the ductility of the ordered Ni3Fe alloys is fast decreased, and then turns to be stable with the increase of hydrogen pressure or current density during simultaneous hydrogen charging. The hydrogen embrittlement factor has the same dependence on the hydrogen pressure and charging current density. The mechanism of hydrogen embrittlement of ordered Ni3Fe alloy in gaseous hydrogen is the atomic hydrogen diffusing into the alloy through the catalytic reaction, and the degree of embrittlement is proportional to the amount of hydrogen atoms diffusing into the alloy.