The Effect of Additional Elements on Hydrogen Permeation Properties of Melt-Spun Ni-Nb-Zr Amorphous Alloys

Yamaura, Shin Ichi; Shimpo, Yoichiro; Okouchi, Hitoshi; Nishida, Motonori; Kajita, Osamu; Inoue, Akihisa

doi:10.2320/matertrans.45.330

Cited by 46 publications

(22 citation statements)

References 6 publications

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“…Starting with the Ni 60 Nb 40 amorphous alloy (defined as a metallic glass without any detectable T g from DSC analyses), Inoue and co-workers investigated the effect of several alloying elements on the hydrogen permeability, and eventually proposed the Zr 50 (Ni 0.6 Nb 0.4 ) 45 Co 5 as the most optimal composition [9,10]. Amorphous ribbons of this composition demonstrated excellent hydrogen permeability, as high as those of Pd-Ag and Pd-Cu alloys in the temperature range of 300°C to 400°C [10].…”

Section: Introductionmentioning

confidence: 99%

“…Such a behavior is very inviting for new applications, like micro-molding or micro-forming of components for MEMS/ NEMS devices [6][7][8]. However, together with other possible applications, metallic alloys with an amorphous structure have recently been proposed as candidate materials for permeation membranes for the purification of hydrogen [9][10][11][12][13][14]. Although these membranes generally operate in a range of temperature lower than the glass transition temperature, T g , their chemical and mechanical stability are important.…”

Section: Introductionmentioning

confidence: 99%

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High temperature mechanical properties of rapidly quenched Zr50Ni27Nb18Co5 amorphous alloy

Jayalakshmi

Fleury

2009

Met. Mater. Int.

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The high temperature mechanical properties of Zr50Ni27Nb18Co5 amorphous ribbons, proposed as metallic membrane material for hydrogen purification are presented. The mechanical behavior of the amorphous alloy, which generally does not exhibit a super-cooled liquid region, can be categorized into varying temperature regimes. A strain rate dependent phenomenon was observed between 425°C < T < 490°C in the strain rate range of 10 −6 s −1 to 10 −2 s −1 . However, the alloy did not exhibit Newtonian-flow characteristics at the varied test temperature and strain rate range employed in this study. Detailed analyses indicated that in these temperature regimes structural changes occur, resulting in the formation of nanocrystalline phases. The results from these mechanical tests corroborated with the microstructural changes that occurred at these temperatures/ strain rates.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High temperature mechanical properties of rapidly quenched Zr50Ni27Nb18Co5 amorphous alloy

Jayalakshmi

Fleury

2009

Met. Mater. Int.

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“…During the past decade, V-based hydrogen permeation alloys have been actively investigated by Nishimura et al 3,4) Yamaura et al have investigated the melt-spun amorphous Ni-Nb-Zr alloys as new membranes. [5][6][7] However, hydrogen permeability (È) for these alloys is lower than that of the corresponding crystalline alloys. 8) Here, we discuss the relation among È, the hydrogen embrittlement and the workability of hydrogen permeation alloys to develop the high performance membranes.…”

Section: Introductionmentioning

confidence: 99%

Changes in Hydrogen Permeability and Microstructures of Nb-(Ti, Zr)Ni Alloys by Cold Rolling and Annealing

2007

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Maximum cold rolling reduction rates of as-cast Nb 40 Ti 30Àx Zr x Ni 30 alloys were measured to evaluate ductility by measuring the change in the thickness. 50% or higher reduction rates were obtained for the alloys containing the Zr content of 12 mol% or less, but lower values were obtained for the alloys substituted with more Zr. Changes of hydrogen permeability (È) and microstructures of the Nb 40 Ti 18 Zr 12 Ni 30 alloy caused by cold-rolling and subsequent vacuum annealing were investigated. È of this alloy was reduced to the half of the as-cast one by the 50% reduction rate, but recovered to 3:23 Â 10 À8 [molH 2 m À1 s À1 Pa À0:5 ], which is 1.13 times higher than that of as-cast one, by a subsequent annealing for 360 ks at 1273 K. Although the eutectic phase disappeared and was replaced by a small spherical (Nb, Ti, Zr) phase embedded in the (Ti, Zr)Ni matrix after rolling and subsequent annealing, these alloys showed good resistance to the hydrogen embrittlement at 523 K or more.

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“…The Zr-based bulk glassy alloys have also been used in the following fields ; (1) precision die pressing materials to produce plastic lenses with accurate outer shapes and smooth surfaces at nanometer scales, (2) various kinds of mirrors, (3) precision connecting parts for optical fibers, (4) casing materials for clocks, watches and cell phones, and (5) electromagnetic shielding plates. In chemical applications, Ni-Nb-Zrbased glassy alloy sheets exhibit hydrogen permeation about 2.2 times greater than that of conventional Pd23mass%Ag alloy over the rather wide temperature range of 573 -673 K. 53), 54) The Ni-based Ni-Nb-Ti-Zr-CuCo glassy alloys with high corrosion resistance have been used as separators for polymer electrolyte fuel cells. 55) The separators were fabricated by die pressing of the melt-spun 70 µm thick sheet in the supercooled liquid region.…”

Section: Supercooled Liquid Metallurgy and Its Significance To Materimentioning

confidence: 99%

Bulk glassy and nonequilibrium crystalline alloys by stabilization of supercooled liquid: fabrication, functional properties and applications (Part 2)

Inoue

2005

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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Magnetic properties. Although glassy alloys inFe-and Co-based systems exhibit good soft magnetic properties, the characteristics are expected to be nearly the same as those for amorphous alloys, which require high cooling rates (> 10 5 K/s) for their formation.Recently, it has been found that the soft magnetic properties of Fe-and Co-based glassy alloys are much superior to those for Fe-and Co-based amorphous alloys.1)-3) Figure 1 summarizes the relationship between coercivity (H c ) and the ratio of saturation magnetostriction (λ s ) to saturation magnetic flux density (J s ) for Fe-based glassy alloys, together with data for Fe-based amorphous alloys. A rather good linear relationship is recognized for both alloy groups, which can be expressed as H c ∝ λ s /J s . It is known that the gradient in the relationship between H c and λ s /J s depends on the volume and density of internal defects, i.e., structural inhomogeneity in their alloys. 4) As seen in Fig. 1, the gradient of Fe-based glassy alloys is much smaller than that of Fe-based amorphous type alloys, indicating that the Fe-based glassy alloys have more homogeneous atomic configurations with lower volumes and densities of internal defects than ordinary Fe-based amorphous type alloys produced at much higher cooling rates. It is therefore concluded that the formation of these more homogeneous atomic configurations is the origin of the lower coercivity of Fe-based glassy alloys. Reflecting the lower coercivity, the Fe-based glassy alloys exhibit much higher permeability than Febased amorphous alloys, in conjunction with a rather high saturation magnetization of 1.2 -1.5 T. With their good soft magnetic properties, the Fe-based glassy alloys have been used as consolidated magnetic cores of common mode choke coils and noise filters for electrical power supplies through the development of an inexpensive mass-production process consisting of water atomization, followed by mixing with insulating and lubricating materials, drying, crushing, classification, forming and then heat treatment. Abstract: The novel stabilization phenomenon of supercooled liquid in special multi-component metallic alloys that follow the three component rules has enabled us to fabricate a number of bulk glassy and nonequilibrium crystalline alloys exhibiting useful characteristics. Following the previous review (Part 1; Proc. Jpn. Acad. Ser. B 81, 156-171), this paper (Part 2) reviews our recent results on the physical, chemical, mechanical and magnetic properties of the resulting bulk nonequilibrium materials including glassy single phase alloys, nanocrystal-, nanoquasicrystal-and dendritic crystal-dispersed glassy alloys and nanocrystalline alloys. Finally, the application potential of bulk glassy alloys is addressed, taking account of their novel engineering properties and production processes.

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The Effect of Additional Elements on Hydrogen Permeation Properties of Melt-Spun Ni-Nb-Zr Amorphous Alloys

Cited by 46 publications

References 6 publications

High temperature mechanical properties of rapidly quenched Zr50Ni27Nb18Co5 amorphous alloy

High temperature mechanical properties of rapidly quenched Zr50Ni27Nb18Co5 amorphous alloy

Changes in Hydrogen Permeability and Microstructures of Nb-(Ti, Zr)Ni Alloys by Cold Rolling and Annealing

Bulk glassy and nonequilibrium crystalline alloys by stabilization of supercooled liquid: fabrication, functional properties and applications (Part 2)

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