Localized modes of hydrogen and deuterium in NiTiHx and NiTiDx

Solubility and diffusion of hydrogen in TiNi1−xCux (x=0.2 and 0.4) shape memory alloys

“…Hydrogen behaviour in the binary alloy NiTi has been studied by several groups [9][10][11], including ours [12], and to date the diffusivity [9,12] and solubility [9] of H as well as hydride structures [10] are rather well known, at high temperatures. Instead not much is known about H behaviour in the NiTiCu alloy system.…”

Diffusion of hydrogen in the shape memory alloy Ni47Ti40Hf10Cu3

“…In this alloy substitution of Hf for Ti and Cu for Ni occurs and H atoms are expected to occupy octahedral interstitial sites of type (Ni, Cu) 2 (Ti, Hf) 4 [17,18], that is, sites having two Ni(Cu) atoms as nearest neighbours and four Ti(Hf) atoms as next nearest neighbours. P H is believed to be due to the stress-induced reorientation of H elastic dipoles taking place through classical over-barrier jumps between adjacent (Ni, Cu) 2 (Ti, Hf) 4 sites.…”

“…Tel. : +39 03473895182; fax: +39 07544666. diffusion and solubility of H as well as hydride formation [17][18][19].…”