In this paper the tensile properties of both ordered and disordered Ni-24Fe and Ni-24Fe-0.03%B （wt%） alloys in gaseous hydrogen was investigated. The result shows that the ductility of the disordered Ni3Fe is significantly larger than that of ordered material in gaseous hydrogen. However, the ductility of ordered Ni3Fe doped with 0.03%B is nearly the same as that of disordered one indicating the obvious suppressing effect of boron on the H2-induced embrittlement. Based on the segregation behavior of boron in Ni3A1, it is proposed that the suppressing effect of boron in Ni3Fe on the H2-induced embrittlement is attributed to the segregation of boron on grain boundaries, thereby reducing the hydrogen diffusivity along the grain boundaries.
To illuminate the intrinsic surface activity of Zr52.5Cu17.9Ni14.6Ti5Al10 alloy in its glass and nanocrystalline states,hydrogen absorption and desorption in both states was investigated by gas chromatographic analysis. The results show that the Zr52.5Cu17.9Ni14.6Ti5Al10 alloy in the nanocrystalline state can absorb a larger amount of hydrogen than that in glass state at room temperature after activation. According to the desorption process and surface state,the significant change in absorption induced by crystallization is proposed to result from that the glassy alloy has a higher desorption energy,which can adsorb gas physically and nonselectively,and is difficult to activate,while the nanocrystalline alloy can absorb much hydrogen due to the inter-atomic or intra-atomic electron transfer,which accelerates the kinetics of the catalytic reaction for the dissociation of molecular hydrogen into atomic hydrogen.
