Environmental embrittlement in air of Al-Zn-Mg-Cu alloys with Cr or Zr

誠, 安藤; 政臣, 妹尾; 幹宏, 菅野

doi:10.2464/jilm.57.19

Cited by 16 publications

(5 citation statements)

References 8 publications

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“…Studies concerning the state of hydrogen in materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][48][49][50][51] cited lattice defects (atomic vacancy, dislocation, and grain boundaries), impurity atoms, precipitates, inclusion boundaries, voids, etc., as hydrogen trap sites. Distinguishing the state of hydrogen has recently become possible with thermal desorption spectrometry and the like, based on the binding energy between such trap sites and hydrogen.…”

Section: B Effect Of Microstructure Of Coatings On Hydrogen-permeatimentioning

confidence: 99%

“…The presence of hydrogen in many metallic materials, such as carbon steel, [1][2][3][4][5] stainless steel, [6][7][8][9] and aluminum alloys, [10][11][12] is widely known to negatively affect the mechanical characteristics. In particular, steel composed primarily of ferrite or martensite structures with higher strength is known to have high hydrogen diffusibility and strong tendency to suffer from hydrogen embrittlement.…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured thin films for hydrogen-permeation barrier

Tamura

Eguchi

2015

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The authors confirmed that applying a coating of Al2O3, TiC, or TiN on a substrate reduced the hydrogen permeation by a factor of at least one order of magnitude compared with uncoated substrates. Al2O3 films consisting of fine crystal grains, with diameters of about 40 nm or less, provided superior hydrogen-permeation barriers on the test specimens. The test specimens coated with TiN or TiC films, with columnar crystals grown vertically on the substrate, tended to exhibit higher hydrogen permeability. The microcrystalline structures with many grain boundaries are expected to provide effective hydrogen-barrier performance.

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Section: B Effect Of Microstructure Of Coatings On Hydrogen-permeatimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanostructured thin films for hydrogen-permeation barrier

Tamura

Eguchi

2015

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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“…The alloy strengths significantly increase with rare-earth addition for alloys containing both Zr and Cr additions, but not when either Zr or Cr addition is absent. The viability of using Zr and Cr additions in 3 rd Generation 7xxx series alloy thick-section alloy products is under evaluation, as a Cr addition can provide potential EIC benefits in its own right [52,75,82,[183][184][185]. However, potential 'quench-sensitivity' issues could limit the usefulness of rare-earth additions in thick-section 4 th Generation commercial alloys.…”

Section: Th Generation Al-zn-mg-cu Alloysmentioning

confidence: 99%

Environment-Induced Cracking of High-Strength Al-Zn-Mg-Cu Aluminum Alloys: Past, Present, and Future

Holroyd¹,

Burnett

Lewandowski

et al. 2022

Corrosion

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Environment induced cracking (EIC) during commercial use of aluminum alloys started over 125 years ago (mid-1890’s), some 45 years earlier than previously documented, with earliest failures for Al-Zn-Mg-Cu, 7xxx series alloys occurring a decade later. Needs for lighter, thicker and stronger alloy products, firstly driven by WW1 and WW2 militaristic requirements and subsequently by relentless demands from modern aircraft industry designers, resulted in major in-service EIC in commercial high strength Al-Zn-Mg-Cu alloys in the US and UK during the 1950’s, 1960’s and 1970’s. These were avoidable had research findings from France, Germany and Japan from the 1930’s and 1940’s been implemented. Unprecedented US Government R&D funding during the late 1960’s, 1970’s and early 1980’s led to AA7050 and similar alloys, that essentially eliminated EIC issues during commercial usage for several decades. EIC assessment for the following ‘new-generation’ high-strength alloys relied totally on standard ASTM Test Methods, incapable of providing data directly relatable to the service conditions. Although EIC service issues for the latest generation of 7xxx series alloys remains manageable, the premature appearance of EIC requires a quantitative understanding of EIC initiation under environmental and mechanical conditions directly relatable to intended use, to prevent un-expected failures for future alloys. Directions for future high-strength 7xxx series aluminum alloy development and EIC assessment to provide quantitative date relatable to service conditions and input for structural design and for service life prediction are discussed.

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“…Hydrogen in many metallic materials, such as carbon steel [1][2][3][4][5], stainless steel [6][7][8][9], and aluminum alloys [10][11][12], affects their mechanical properties negatively. Steels mainly composed of high-strength ferrite and martensite structures have exceptionally high hydrogen diffusibilities and often exhibit hydrogen embrittlement [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Permeation of Multi-Layered-Coatings

Tamura

2019

AMR

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Using a substrate of AISI 316L austenitic stainless steel, which is used for components in high-pressure hydrogen systems, the hydrogen barrier properties of samples with single-layer coatings of TiC, TiN, and TiAlN as well as a multi-layered coating of TiAlN and TiMoN were evaluated. The ion plating method was used, and coating thicknesses of 2.0–2.6 μm were obtained. Hydrogen permeation tests were carried out under a differential hydrogen pressure of 400 kPa and at a temperature between 573 and 773 K, and the quantities of hydrogen that permeated the samples were measured. This study aimed at elucidating the relationship between the microstructures of the coatings and the hydrogen permeation properties. Coatings of TiC, TiN, TiAlN, and TiAlN/TiMoN facilitated reductions of the hydrogen permeabilities to 1/100 or less of that of the uncoated substrate. The samples coated with TiN and TiC that developed columnar crystals vertical to the substrate exhibited higher hydrogen permeabilities. The experiment confirmed that the coatings composed of fine crystal grains were highly effective as hydrogen barriers, and that this barrier property became even more efficient if multiple layers of the coatings were applied. The crystal grain boundaries of the coating and interfaces of each film in a multi-layered coating may serve as hydrogen trapping sites. We speculate that fine crystal structures with multiple crystal grain boundaries and multi-layered coating interfaces will contribute to the development of hydrogen barriers.

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Environmental embrittlement in air of Al-Zn-Mg-Cu alloys with Cr or Zr

Cited by 16 publications

References 8 publications

Nanostructured thin films for hydrogen-permeation barrier

Nanostructured thin films for hydrogen-permeation barrier

Environment-Induced Cracking of High-Strength Al-Zn-Mg-Cu Aluminum Alloys: Past, Present, and Future

Hydrogen Permeation of Multi-Layered-Coatings

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