Internal friction in hydrogen-charged aluminium alloys

Leger, M.; Piercy, G. R.

doi:10.1080/01418618108239416

Cited by 25 publications

(10 citation statements)

References 11 publications

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“…Increasing Cu content leads to an increase in the amount of hydrogen retained in solid Al-Cu alloys [121]. Internal friction experiments have placed an upper bound for a binding energy to Cu in solution to 0.05 eV [122]. Tritium autoradiography experiments have shown that in Al-Cu (unlike Al-Si alloys), all of the metastable and stable precipitate phases may trap hydrogen [116].…”

Section: Introductionmentioning

confidence: 99%

Understanding H isotope adsorption and absorption of Al-alloys using modeling and experiments (LDRD: #165724)

Ward

Zhou

Karnesky

et al. 2015

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Current austenitic stainless steel storage reservoirs for hydrogen isotopes (e.g. deuterium and tritium) have performance and operational life-limiting interactions (e.g. embrittlement) with H-isotopes. Aluminum alloys (e.g.AA2219), alternatively, have very low H-isotope solubilities, suggesting high resistance towards aging vulnerabilities. This report summarizes the work performed during the life of the Lab Directed Research and Development in the Nuclear Weapons investment area (165724), and provides invaluable modeling and experimental insights into the interactions of H isotopes with surfaces and bulk AlCu-alloys. The modeling work establishes and builds a multi-scale framework which includes: a density functional theory informed bond-order potential for classical molecular dynamics (MD), and subsequent use of MD simulations to inform defect level dislocation dynamics models. Furthermore, low energy ion scattering and thermal desorption spectroscopy experiments are performed to validate these models and add greater physical understanding to them. ACKNOWLEDGMENTS Sandia National Laboratories is a multiprogram laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the US Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000 (SAND2014-3909 J). This work was performed under a Laboratory Directed Research and Development (LDRD) project. The authors appreciate the valuable discussions with the reviewers. We thank Professor Wei Cai of Stanford University for his contributions to the dislocation dynamics algorithm development. Additionally, we would like to thank Dorian Balch (8254), Chris San Marchi (8367), Brian Somerday (8367), and James Foulk (8256) for thoughtful conversation in framing the outline for this project.

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Section: Introductionmentioning

confidence: 99%

Understanding H isotope adsorption and absorption of Al-alloys using modeling and experiments (LDRD: #165724)

Ward

Zhou

Karnesky

et al. 2015

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“…Gest and Troiano (1972) found transgranular cracking as a prominent fracture. It is also said that the effect of hydrogen is largest for the underaged condition and smallest for the overaged, thus following the pattern found for the susceptibility to SCC in high strength aluminium alloys (Leger and Piercy 1981;Albrecht et al 1982).…”

Section: Cathodic Charging and Slow Strain Rate Hydrogen Embrittlementmentioning

confidence: 60%

“…Edvards and Eichenauer (1980) observed a decline in solubility of hydrogen as grain growth increases due to the reduction in grain boundary area indicating grain boundary segregation of hydrogen. The binding enthalpy between hydrogen and grain boundary is reported to be 14 KJ/mol (0-15 eV) (Leger and Piercy 1981) which is much less than that obtained for vacancies (0.5 eV), There are certain discrepancies in the nature of hydrogen transport in aluminium. The fact that the diffusion of hydrogen in aluminium is very small at room temperature makes it difficult to rationalize the effect of hydrogen on various properties which need a faster movement of hydrogen atoms.…”

Section: Rtmentioning

confidence: 79%

Effect of hydrogen in aluminium and aluminium alloys: A review

Ambat

Dwarakadasa

1996

Bull. Mater. Sci.

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~bstracL Susceptibility of aluminium and its alloys towards hydrogen embrittlement has been well established. Still a lot of confusion exists on the question of transport of hydrogen and its possible role in stress corrosion cracking. This paper reviews some of the fundamental properties of hydrogen in aluminium and its alloys and its effect on mechanical properties. The ~mportance of hydrogen embrittlement over anodic dissolution to explain the stress corrosion cracking mechanism of these alloys is also examined in considerable detail. The various experimental findings concerning the link between hydrogen embrittlement and stress corrosion cracking are also discussed.

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“…In this analysis trap binding energy, Eb for solute magnesium was assumed to its upper limit, i.e. 5.8 kJ mol -1 [47] and Eb value for high angle grain boundary is 35 kJ mol -1 [21]. Eb values for the vacancy and dislocation is taken as 11.4 kJmol -1 and 17.9 kJmol -1 , respectively.…”

Section: H Trap Site Calculationmentioning

confidence: 99%

Combined microtomography, thermal desorption spectroscopy, X-ray diffraction study of hydrogen trapping behavior in 7XXX aluminum alloys

Bhuiyan

Toda

Zhang

et al. 2016

Materials Science and Engineering: A

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In the present study, combined thermal desorption spectroscopy (TDS), microtomography and X-ray diffraction study has been carried out to identify the hydrogen trap sites in 7XXX aluminum alloys. Through constant heating rate TDS experiments, three distinct trap states have been identified. It is revealed that micropores are the predominant hydrogen trap site in alloys with medium hydrogen content, whereas grain boundaries is the major hydrogen trap site in alloys with low and high hydrogen content. We have clarified that the rate of trap site occupancy in grain boundaries is high compared to dislocations and vacancies. Such high hydrogen coverage at grain boundaries indicates that the hydrogen-assisted fracture would be intergranular.

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Internal friction in hydrogen-charged aluminium alloys

Cited by 25 publications

References 11 publications

Understanding H isotope adsorption and absorption of Al-alloys using modeling and experiments (LDRD: #165724)

Understanding H isotope adsorption and absorption of Al-alloys using modeling and experiments (LDRD: #165724)

Effect of hydrogen in aluminium and aluminium alloys: A review

Combined microtomography, thermal desorption spectroscopy, X-ray diffraction study of hydrogen trapping behavior in 7XXX aluminum alloys

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