Energetics and diffusion of hydrogen in hydrogen permeation barrier of α-Al2O3/FeAl with two different interfaces

Zhang, Guikai; Wang, Xiaolin; Yang, Fuqiang; Shi, Yan; Song, Jiangfeng; Lai, Xinchun

doi:10.1016/j.ijhydene.2013.03.136

Cited by 32 publications

(21 citation statements)

References 40 publications

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“…Diffusion of the adsorbed hydrogen atoms from the outer part of the solution/oxide layer into the α-Al 2 O 3 layer is thermodynamically unfavorable, endothermic and rate-controlling. In contrast, the H diffusion from the inner part of α-Al 2 O 3 to the oxide/bulk interface, as well as from the interface into the bulk of the Fe-Al, are thermodynamically spontaneous and exothermic processes [156]. It should be mentioned here that the diffusion mechanism through the passive layer and also the passive layer/bulk metal interface is still largely unknown and has, so far, not been completely explored in published papers.…”

Section: Mechanism Of Hydrogen Ingressmentioning

confidence: 94%

“…In the case of Fe, for example, the hydrogen diffusivity in the iron oxide layer is much less than that in iron (around 10´1 4 m 2 /s) [153,155]. Based on the density functional theory simulation [156], existence of an Al 2 O 3 layer on the Fe-Al bulk material suppresses the mobility of hydrogen atoms. Diffusion of the adsorbed hydrogen atoms from the outer part of the solution/oxide layer into the α-Al 2 O 3 layer is thermodynamically unfavorable, endothermic and rate-controlling.…”

Section: Mechanism Of Hydrogen Ingressmentioning

confidence: 99%

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A Review on the Properties of Iron Aluminide Intermetallics

2016

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Iron aluminides have been among the most studied intermetallics since the 1930s, when their excellent oxidation resistance was first noticed. Their low cost of production, low density, high strength-to-weight ratios, good wear resistance, ease of fabrication and resistance to high temperature oxidation and sulfurization make them very attractive as a substitute for routine stainless steel in industrial applications. Furthermore, iron aluminides allow for the conservation of less accessible and expensive elements such as nickel and molybdenum. These advantages have led to the consideration of many applications, such as brake disks for windmills and trucks, filtration systems in refineries and fossil power plants, transfer rolls for hot-rolled steel strips, and ethylene crackers and air deflectors for burning high-sulfur coal. A wide application for iron aluminides in industry strictly depends on the fundamental understanding of the influence of (i) alloy composition; (ii) microstructure; and (iii) number (type) of defects on the thermo-mechanical properties. Additionally, environmental degradation of the alloys, consisting of hydrogen embrittlement, anodic or cathodic dissolution, localized corrosion and oxidation resistance, in different environments should be well known. Recently, some progress in the development of new micro-and nano-mechanical testing methods in addition to the fabrication techniques of micro-and nano-scaled samples has enabled scientists to resolve more clearly the effects of alloying elements, environmental items and crystal structure on the deformation behavior of alloys. In this paper, we will review the extensive work which has been done during the last decades to address each of the points mentioned above.

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Section: Mechanism Of Hydrogen Ingressmentioning

confidence: 94%

Section: Mechanism Of Hydrogen Ingressmentioning

confidence: 99%

A Review on the Properties of Iron Aluminide Intermetallics

2016

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“…DMol3 in Materials Studio of Accelrys Inc. successfully captures the properties of FeAl. [11][12][13][14][15][16] In comparison with local density approximation (LDA) and Perdew, Burke, and Ernzerhof (PBE), the density functions conrm the principal ndings for FeAl based on Perdew and Wang (PW91). 13,15 Thus, we performed the calculations within the PW91-GGA (generalized gradient approximation) using a double numerical quality basis set with polarization functions (DNP) 17 and a semi-core pseudopotential.…”

Section: Computational Methods and Modelmentioning

confidence: 99%

Stability and clusterization of hydrogen-vacancy complexes in B2-FeAl: insight from hydrogen embrittlement

Zhang

Huang

et al. 2017

RSC Adv.

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“…After coating with aluminide TPBs, the deuterium permeation flux at 552-700 • C of each Cr steel sample was remarkably reduced, up to two orders of magnitude, as shown in Figure 7a, indicating that the prepared aluminide TPBs were effective in deuterium permeation resistance, which could be attributed to the formation of outer scales. Generally speaking, for FeAl/Al 2 O 3 -type aluminide TPBs, the hydrogen PRF of an outer Al 2 O 3 scale under a convenient service condition is much higher than that of the inner transition FeAl layer, which has been verified both in experimental and theoretical studies [1,43]. From the view of PRF, the deuterium PRF for 1Cr8 steel samples at 552, 605, 652, and 700 • C were 185, 144, 118, and 110, respectively; for 1Cr13 steel samples, they were 250, 233, 226, and 218; and for 1Cr15, they were 300, 240, 220, and 204.…”

Section: Deuterium Permeation Resistance Of Aluminide Tpbsmentioning

confidence: 80%

“…To achieve the best tritium permeation resistance, the aluminide coatings have to be selectively oxidized to form a thin layer of Al 2 O 3 film, since the main functional component of aluminide TPBs is the outer Al 2 O 3 film (other than the inner Fe-Al transition layer) [43]. Experimentally, selective oxidation is often realized via control of the content of alloying elements and oxygen pressure, etc.…”

Section: Oxidation Of Aluminide Coatingmentioning

confidence: 99%

Effect of Steel Substrates on the Formation and Deuterium Permeation Resistance of Aluminide Coatings

et al. 2019

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The effect of steel substrates on the formation and deuterium permeation resistance of aluminide coatings for tritium permeation barrier applications was investigated. It was found that the average thickness and crystal structure of electrodeposited Al coatings varied with Cr steel substrates. After aluminization in vacuum, significant differences existed in the composition and thickness of (Fe,Cr) 2 Al 5 -type aluminide layers formed on different Cr steel substrates, in which the alloying element Cr from steel substrates was involved. Thereafter, the scale microstructural feature and thickness also changed with the Cr steel substrate after selective oxidation in an Ar gas stream. Consequently, the deuterium permeation resistance of the formed aluminide tritium permeation barriers (TPBs) differed by steel substrates, indicating that the substrate effect existed in aluminide TPB coatings and thus could have a significant influence on the formation and eventual performance of aluminide TPBs.

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Energetics and diffusion of hydrogen in hydrogen permeation barrier of α-Al2O3/FeAl with two different interfaces

Cited by 32 publications

References 40 publications

A Review on the Properties of Iron Aluminide Intermetallics

A Review on the Properties of Iron Aluminide Intermetallics

Stability and clusterization of hydrogen-vacancy complexes in B2-FeAl: insight from hydrogen embrittlement

Effect of Steel Substrates on the Formation and Deuterium Permeation Resistance of Aluminide Coatings

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