Hydrogen absorption properties of amorphous and crystalline alloys in the pseudobinary ZrCo-TiNi system

The single phase amorphous alloys were prepared by rapid quenching of the pseudobinary (ZrCo)(100-x) (TiNi)(x) alloys. The amorphous a-(ZrCo)(70)(NiTi)(30) alloy crystallized into the ordered B2 compound, while the others did into the disordered bcc alloys. The PCT curve of the crystalline compounds showed a plateau pressure, while that of the amorphous one did not. Nearly the same amount of hydrogen was absorbed in the amorphous and crystalline phases. Both the amorphous and crystalline alloys showed the maximum hydrogen absorption capacity of 1.6 (H/M) at the composition of x=30, i.e. at the composition where the alloys crystallized into the B2 structure. The present work indicates that the ordered (B2) alloy absorbs much more hydrogen rather than the corresponding disordered (bcc) ones. (C) 1999 Elsevier Science S.A. All rights reserved.