Hydrogen Permeation Characteristics of Melt-Spun Ni-Nb-Zr Amorphous Alloy Membranes

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

doi:10.2320/matertrans.44.1885

Cited by 105 publications

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References 38 publications

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“…1,2) These amorphous alloys are expected to act as a membrane material for hydrogen purification due to their high hydrogen permeability. 3) In contrast, recent studies indicate that quaternary Nb-Ni-Ti-Zr glassy alloys exhibit high hydrogen impermeability, corrosion resistance, and formability for use in fuel cells as bipolar plates. 4,5) Apart from the formation of glassy or amorphous alloys, the hydrogen permeation characteristics of ternary Nb-Ni-Ti alloys have been investigated, and new hydrogen permeation alloys consisting of NiTi and bcc (Nb,Ti) duplex phases have been developed.…”

Section: Introductionmentioning

confidence: 84%

Thermodynamic Calculation of Phase Equilibria in the Nb-Ni-Ti-Zr Quaternary System

et al. 2007

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The phase equilibria in the Nb-Ni-Ti-Zr quaternary system have been studied using the CALPHAD method. Among the four ternary systems present in the quaternary phase diagram, the Nb-Ti-Zr ternary system was described using a simple ternary extrapolation of the constituent binary systems with no additional ternary parameters. The thermodynamic parameters of the Ni-Ti-Zr ternary system were evaluated using data from first-principles calculations on the ternary NiTi, NiZr, and NiTiZr compound phases as well as available experimental data on the phase boundaries. The calculated isothermal and vertical section diagrams of both the Nb-Ti-Zr and Ni-Ti-Zr ternary systems reproduced the experimental results satisfactorily. The thermodynamic parameters of the Nb-Ni-Ti and Nb-Ni-Zr ternary systems were adopted from previous studies. The liquidus surface in the Nb-Ni-Ti-Zr quaternary system was calculated based on the thermodynamic description of the ternary systems. According to the calculated liquidus surface of Nb 40ÀxÀy Ni 60 Ti x Zr y alloys, in which a metallic glass was formed over a wide composition range, the liquidus temperature decreased with increasing Zr content up to 20 mol%Zr.

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Section: Introductionmentioning

confidence: 84%

Thermodynamic Calculation of Phase Equilibria in the Nb-Ni-Ti-Zr Quaternary System

et al. 2007

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“…Они оказались перспективными для применения в сепараторах для топливных элементов вследствие хорошей про-пускающей способности водорода через мембраны сплавами Zr-Hf-Ni [122] и Ni-Nb-Zr [123].…”

Section: применениеunclassified

Properties of Bulk Metallic Glasses

Luzgin¹,

Polkin²

2016

Izv.VUZ. Tsvet. Met.

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Металловедение и термическая обработка Izvestiya vuzov. Tsvetnaya metallurgiya • 6 • 2016 71 ВведениеМеталлические стекла, получаемые в виде тон-ких чешуек или лент, известны со второй полови-ны прошлого века [1]. Объемные металлические стекла (ОМС) с минимальным размером порядка 100-102 мм в каждом из 3 пространственных из-мерений [2] изначально были получены в системах Pd-Cu-Si и Pd-Ni-P, но ввиду исключительной дороговизны основного компонента (палладия) долгое время не представляли особого интере-са для ученых и инженеров. Впоследствии ОМС, полученные во многих других системах, включая технологически важные -на основе Fe, Mg, Ti и За последние несколько десятилетий открыто относительно небольшое число революционных материалов в области ме-талловедения и физики металлов, и объемные металлические стекла одни из них. Их прочность и твердость значительно выше, а модуль упругости ниже, чем кристаллических сплавов, что приводит к высокой энергии запасенной упругой деформации. Эти материалы также имеют очень хорошую устойчивость к коррозии. В настоящей работе исследованы свойства объемных металлических стекол, в частности тепловые, механические, магнитные, электрические показатели и коррозионная стойкость, а также приводятся области применения данных сплавов. Louzguine-Luzgin D.V., Pol'kin V.I. Properties of bulk metallic glassesA relatively small number of revolutionary discoveries were made in the field of metallurgy and metal physics in the last few decades, and bulk metallic glasses are one of them. The strength and hardness of bulk metallic glasses are much higher while moduli of elasticity are lower than those of crystalline alloys which results in high stored elastic strain energy. These alloys also have very good corrosion resistance. This article covers various properties of bulk metallic glasses, in particular thermal, mechanical, magnetic, electrical properties and corrosion resistance as well as applications of these alloys.Keywords: bulk metallic glasses, strength, ductility, application.

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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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Hydrogen Permeation Characteristics of Melt-Spun Ni-Nb-Zr Amorphous Alloy Membranes

Cited by 105 publications

References 38 publications

Thermodynamic Calculation of Phase Equilibria in the Nb-Ni-Ti-Zr Quaternary System

Thermodynamic Calculation of Phase Equilibria in the Nb-Ni-Ti-Zr Quaternary System

Properties of Bulk Metallic Glasses

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

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