Samples of (Ni0.6Nb0.4)45Zr50X5 alloy ribbons (X = Al, Co, Cu, P, Pd, Si, Sn, Ta or Ti) were produced by using the melt-spinning technique. All of the ribbon specimens were confirmed to consist of a single amorphous phase. The crystallization temperatures of the melt-spun (Ni0.6Nb0.4)45Zr50X5 (X = Al, P, Pd, Si or Sn) amorphous alloys were higher than that (727K) of (Ni0.6Nb0.4)50Zr50 amorphous alloy. Although the H permeability of the (Ni0.6Nb0.4)45Zr50X5 (X = Si, Sn, Ta or Ti) amorphous alloys could not be measured, due to severe embrittlement during testing, the (Ni0.6Nb0.4)45Zr50X5 (X = Al, Co, Cu, P or Pd) amorphous alloys had ductilities which were high enough to permit measurement of the permeability. The H permeabilities of (Ni0.6Nb0.4)45Zr50Co5 and (Ni0.6Nb0.4)45Zr50Cu5 were 2.46 x 10-8 and 2.34 x 10-8mol/msPa1/2, respectively, at 673K. The (Ni0.6Nb0.4)45Zr50P5 alloy exhibited the lowest permeability (1.36 x 10-8mol/msPa1/2 at 673K). The reduction in the permeability of (Ni0.6Nb0.4)45Zr50P5 was thought to be due to the preferential development of Zr-P atomic pairs which could suppress H solubility and diffusivity; because the heat of mixing for the Zr-P atomic pairs was negatively larger than those of other pairs, such as Ni-P and Nb-P.

The Effect of Additional Elements on Hydrogen Permeation Properties of Melt-Spun Ni-Nb-Zr Amorphous Alloys. S.Yamaura, Y.Shimpo, H.Okouchi, M.Nishida, O.Kajita, A.Inoue: Materials Transactions, 2004, 45[2], 330-3