A New Concept for Alloy Design of Nb-Based Hydrogen Permeable Alloys with High Hydrogen Permeability and Strong Resistance to Hydrogen Embrittlement

2010 ◽  
Vol 654-656 ◽  
pp. 2827-2830 ◽  
Author(s):  
Hiroshi Yukawa ◽  
Masahiko Morinaga ◽  
T. Nambu ◽  
Yoshihisa Matsumoto
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Embrittlement ◽  
Chemical Potential ◽  
Hydrogen Permeability ◽  
Hydrogen Atmosphere ◽  
Alloy Design ◽  
High Hydrogen ◽  
Metal Membrane

A concept for alloy design of Nb-based hydrogen permeable alloys has been proposed based on the mechanical properties of niobium in hydrogen atmosphere and also on the hydrogen chemical potential in metal membrane. Following this concept, Nb-based alloys are designed and developed that possess excellent hydrogen permeability without showing any hydrogen embrittlement.

scholarly journals Mechanical Properties in Hydrogen Atmosphere and Hydrogen Permeability of Nb-W-Ta Alloys for Hydrogen Permeable Membrane

2009 ◽  
Vol 73 (9) ◽  
pp. 742-746 ◽  
Author(s):  
Naoshi Watanabe ◽  
Hiroshi Yukawa ◽  
Tomonori Nambu ◽  
Yoshihisa Matsumoto ◽  
Guoxing Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Permeability ◽  
Hydrogen Atmosphere ◽  
Permeable Membrane

Design of Nb-based multi-phase alloy membranes for high hydrogen permeability and suppressed hydrogen embrittlement

2020 ◽  
Vol 595 ◽  
pp. 117531 ◽  
Author(s):  
Erhu Yan ◽  
R.N. Min ◽  
P. Zhao ◽  
R.D.K. Misra ◽  
P.R. Huang ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
Hydrogen Permeability ◽  
High Hydrogen ◽  
Multi Phase

scholarly journals A Review for Consistent Analysis of Hydrogen Permeability through Dense Metallic Membranes

Membranes ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 120
Author(s):  
Asuka Suzuki ◽  
Hiroshi Yukawa
Keyword(s):  
Diffusion Coefficient ◽  
Hydrogen Embrittlement ◽  
Alloy Composition ◽  
Hydrogen Permeation ◽  
Hydrogen Permeability ◽  
Anomalous Temperature Dependence ◽  
Anomalous Temperature ◽  
High Hydrogen ◽  
Hydrogen Flux ◽  
Solubility Constant

The hydrogen permeation coefficient (ϕ) is generally used as a measure to show hydrogen permeation ability through dense metallic membranes, which is the product of the Fick’s diffusion coefficient (D) and the Sieverts’ solubility constant (K). However, the hydrogen permeability of metal membranes cannot be analyzed consistently with this conventional description. In this paper, various methods for consistent analysis of hydrogen permeability are reviewed. The derivations of the descriptions are explained in detail and four applications of the consistent descriptions of hydrogen permeability are introduced: (1) prediction of hydrogen flux under given conditions, (2) comparability of hydrogen permeability, (3) understanding of the anomalous temperature dependence of hydrogen permeability of Pd-Ag alloy membrane, and (4) design of alloy composition of non-Pd-based alloy membranes to satisfy both high hydrogen permeability together with strong resistance to hydrogen embrittlement.

Vanadium alloy membranes for high hydrogen permeability and suppressed hydrogen embrittlement

2013 ◽  
Vol 68 (11) ◽  
pp. 905-908 ◽  
Author(s):  
Kwang Hee Kim ◽  
Hyeon Cheol Park ◽  
Jaeho Lee ◽  
Eunseog Cho ◽  
Sang Mock Lee
Keyword(s):  
Hydrogen Embrittlement ◽  
Hydrogen Permeability ◽  
Vanadium Alloy ◽  
High Hydrogen

scholarly journals Quantitative Evaluations of Hydrogen Diffusivity in V-X (X = Cr, Al, Pd) Alloy Membranes Based on Hydrogen Chemical Potential

Membranes ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 67
Author(s):  
Asuka Suzuki ◽  
Hiroshi Yukawa
Keyword(s):  
Nearest Neighbor ◽  
Chemical Potential ◽  
Hydrogen Permeability ◽  
First Principle ◽  
Hydrogen Diffusivity ◽  
Hydrogen Atoms ◽  
First Principle Calculations ◽  
Blocking Effects ◽  
Pd Alloy ◽  
Quantitative Evaluations

Vanadium (V) has higher hydrogen permeability than Pd-based alloy membranes but exhibits poor resistance to hydrogen-induced embrittlement. The alloy elements are added to reduce hydrogen solubility and prevent hydrogen-induced embrittlement. To enhance hydrogen permeability, the alloy elements which improve hydrogen diffusivity in V are more suitable. In the present study, hydrogen diffusivity in V-Cr, V-Al, and V-Pd alloy membranes was investigated in view of the hydrogen chemical potential and compared with the previously reported results of V-Fe alloy membranes. The additions of Cr and Fe to V improved the mobility of hydrogen atoms. In contrast, those of Al and Pd decreased hydrogen diffusivity. The first principle calculations revealed that the hydrogen atoms cannot occupy the first-nearest neighbor T sites (T1 sites) of Al and Pd in the V crystal lattice. These blocking effects will be a dominant contributor to decreasing hydrogen diffusivity by the additions of Al and Pd. For V-based alloy membranes, Fe and Cr are more suitable alloy elements compared with Al and Pd in view of hydrogen diffusivity.

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