Thermal Stability and Mechanical Properties of Glassy and Amorphous Ni-Nb-Zr Alloys Produced by Rapid Solidification

Kimura, Hisamichi; Inoue, Akihisa; Yamaura, Shin Ichi; Sasamori, Kenichiro; Nishida, Motonori; Shinpo, Yoichiro; Okouchi, Hitoshi

doi:10.2320/matertrans.44.1167

Cited by 65 publications

(38 citation statements)

References 10 publications

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“…The maximum temperature at which hydrogen permeation was measured in this work was 673 K which was lower by more than 100 K than the crystallization temperature. Kimura et al studied the amorphous formability of the Ni-Nb-Zr ternary alloys and reported that the Ni 60 Nb 20 Zr 20 glassy alloy possessed a large supercooled liquid region, ÁT x (¼ T x À T g , T x : crystallization temperature, T g : glass transition temperature) of 51 K. 40) However, the amorphous alloys prepared in this work possess much narrower or no supercooled liquid region as shown in Fig. 2.…”

Section: Introductionmentioning

confidence: 68%

“…39) Subsequently, Kimura et al have studied the glass-forming ability of NiNb-Zr system and reported that glassy or amorphous Ni-NbZr alloys could be produced in a wide composition range by melt-spinning. 40) The objective of this work is to produce amorphous Ni-based alloys (especially Ni-Nb-Zr alloys) by the melt-spinning technique and to examine the hydrogen permeability of the alloys. The amorphicity of melt-spun ribbon specimens was investigated by X-ray diffractometry (CuK, 40 kV, 30 mA, hereafter denoted as XRD).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2003

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We prepared the melt-spun (Ni 0:6 Nb 0:4 ) 100Àx Zr x (x ¼ 0 to 40 at%) and other amorphous alloy membranes and examined the permeation of hydrogen through those alloy membranes. The interatomic spacing in the Ni-Nb-Zr amorphous structure increased with increasing Zr content. The crystallization temperature of the Ni-Nb-Zr amorphous alloys decreased with increasing Zr content. The hydrogen flow increased with an increase of the temperature or the difference in the square-roots of hydrogen pressures across the membrane, Á ffiffiffi p p . At relatively higher temperature up to 673 K or at relatively higher hydrogen pressure difference, Á ffiffiffi p p up to 550 Pa 1=2 , the hydrogen flow was more strictly proportional to Á ffiffiffi p p . This indicates that the diffusion of hydrogen through the membrane is a rate-controlling factor for hydrogen permeation.The permeability of the Ni-Nb-Zr amorphous alloys was strongly dependent on alloy compositions and increased with increasing Zr content. However, it was difficult to investigate the hydrogen permeability of the (Ni 0:6 Nb 0:4 ) 60 Zr 40 amorphous alloy in this work due to the embrittlement during the measurement. The maximum hydrogen permeability was 1:3 Â 10 À8 (molÁm À1 Ás À1 ÁPa À1=2 ) at 673 K for the (Ni 0:6 Nb 0:4 ) 70 Zr 30 amorphous alloy. It is noticed that the hydrogen permeability of the (Ni 0:6 Nb 0:4 ) 70 Zr 30 amorphous alloy is higher than that of pure Pd metal. These permeation characteristics indicate the possibility of future practical use of the melt-spun amorphous alloys as a hydrogen permeable membrane.

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

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

et al. 2003

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“…A summary plot of hydrogen permeation through Ni-Nb-Zr alloy, with alloying elements such as Ta, Co, Hf and others, is shown in Figure 1; selected Pd-based alloys are included as reference. Please note that single data points found in literature, appear as double circled symbol in this The addition of Nb to Ni-Zr alloys brings the beneficial effects of increased crystallization temperature and fracture strength [28], and reduced susceptibility to hydrogen embrittlement [29]. Kimura et al [28] produced wide, high quality, amorphous Ni-Nb-Zr melt spun ribbons of (Ni0.50Nb0.50)100-xZrx where x = 10, 20, 30, 40, and Ni60Nb40-xZrx where x = 10, 20, 30, 40, and measured thermal and mechanical properties, but did report any permeation results.…”

Section: Amorphous Ni-based Membranesmentioning

confidence: 99%

Developments in the Ni–Nb–Zr amorphous alloy membranes

et al. 2016

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Most of the global H2 production is derived from hydrocarbon-based fuels, and efficient H2/CO2 separation is necessary to deliver a high purity H2 product. Hydrogen-selective alloy membranes are emerging as a viable alternative to traditional pressure swing absorption processes as a means for H2/CO2 separation. These membranes can be formed from a wide range of alloys, and those based on Pd are the closest to commercial deployment. The high cost of Pd (USD ~31,000 kg -1 ), however, is driving the development of less-expensive alternatives, including inexpensive amorphous (Ni60Nb40)100-xZrx alloys. Amorphous alloy membranes can be fabricated directly from the molten state into continuous ribbons via melt spinning, and depending on the composition, can exhibit relatively high hydrogen permeability between 473 and 673 K. Here we review recent developments in these low-cost membrane materials, especially with respect to permeation behavior, electrical transport properties, and understanding of local atomic order. In a quest to further understand the nature of these solids, atom probe tomography has been performed, revealing amorphous Nb-rich and Zr-rich clusters embedded in, majority Ni matrix, whose compositions deviated from the nominal overall composition of the membrane.

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“…boiling 6 N HNO 3 solutions with and without 5 g/l Cr 6þ , for nuclear fuel reprocessing applications, glass alloys selection is very important. Among various types of glassy alloys developed so far, the Ni 60 Nb 20 Zr 20 glassy alloys 13) chosen as a promising candidate for nuclear fuel reprocessing applications for three reasons: (1) The alloy possesses good mechanical properties and a large supercooled liquid region of 51 K. In supercooled liquid region, it can be fabricated into intricate shapes with a high level of dimensional accuracy. (2) The alloy can be formed in a wide ribbon size of a width of 50 mm and a thickness of 25 mm.…”

Section: Introductionmentioning

confidence: 99%

High Corrosion Resistant Ni-Based Glassy Alloys in Boiling Nitric Acid Solutions

et al. 2009

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Thermal Stability and Mechanical Properties of Glassy and Amorphous Ni-Nb-Zr Alloys Produced by Rapid Solidification

Cited by 65 publications

References 10 publications

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

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

Developments in the Ni–Nb–Zr amorphous alloy membranes

High Corrosion Resistant Ni-Based Glassy Alloys in Boiling Nitric Acid Solutions

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