Icosahedral hydrides of the Ti 45 Zr 38 Ni 17−x Co x nano-powders

Żywczak, Antoni; Rusinek, D.; Czub, J.; Sikora, Marcin; Stȩpień, Joanna; Gondek, Ł.; Gajewska, Marta; Takasaki, Akito; Hoser, A.

doi:10.1016/j.jallcom.2015.09.278

Cited by 3 publications

(2 citation statements)

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“…According to these models, the relationship between the microstructure and F (or D) of NbeTiNi/TiCo alloys has been investigated systematically by Saeki et al [21,22]. In the present case, when the continuous and discontinuous distributions of BCC-(Nb, Hf) and HfCo phases in as-cast and a-samples are analogized to the parallel and mixed microstructure, respectively, hydrogen permeability (Ф p and Ф m ) can be described as follow [8,14]:…”

Section: Resultsmentioning

confidence: 98%

“…If this alloy exhibits a high F value compared to the eutectic Nb 30 Ti 35 Co 35 [11] and Nb 19 Ti 40 Ni 41 [10] alloys after annealing, then we may use the rapid quenching technique to prepare thin Nb-HfCo amorphous membrane. However, amorphous alloys are usually thermally unstable and their desirable properties may lost by crystallization under different annealing temperatures [8,14]. Accordingly, it is essential to research on the crystallization behaviors and microstructure stability by heat treatments under different temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Changes in microstructures and hydrogen permeability of Nb30Hf35Co35 eutectic alloy membranes by annealing

Yan

Sun

et al. 2016

International Journal of Hydrogen Energy

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a b s t r a c tChanges in microstructures and hydrogen permeability by long-time annealing (168 h) at 1073, 1173 and 1173 K for eutectic Nb 30 Hf 35 Co 35 alloy are investigated. After annealing at 1073 K and 1173 K for 168 h, the fully lamellar eutectic microstructure in as-cast state has disappeared and turned to a duplex microstructure. Correspondingly, the hydrogen permeability at 673 K, decreases from 3.3 Â 10 À8 to (0.82e1.5) Â 10 À8 mol H 2 m À1 s À1 Pa À0.5 after annealing. The annealed (a-) sample at 1273 K for 168 h is brittle and susceptible to hydrogen embrittlement that results from the appearance of the additional Hf 2 Co phase. The hydrogen solubility coefficient (K) for each a-samples at 673 K is almost the same as that for the as-cast sample, while the hydrogen diffusion coefficient (D) for the a-samples are (1/4e1/2) times than that for the as-cast one. It is thus concluded that the lower permeability by annealing for eutectic Nb 30 Hf 35 Co 35 is mainly attributed to the significant reduction of hydrogen diffusivity after annealing.

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