Addressing the hydrogen entrapment in Al2024 alloys using scanning transmission electron microscopy and density functional theory

被引：0

作者：

Ravaux F. ^{[1
]}

Sajjad M. ^{[2
]}

Zafar H. ^{[2
]}

Daoud M.E. ^{[2
]}

Kamoutsi H. ^{[3
]}

Aubry C. ^{[4
]}

Weston J. ^{[5
]}

Singh N. ^{[2
]}

Haidemenopoulos G. ^{[3
]}

Anjum D.H. ^{[2
]}

机构：

[1] Technology Innovation Institute, P. O. Box: 9639, Masdar City, Abu Dhabi

[2] Physics Department, Khalifa University, Abu Dhabi

[3] Department of Mechanical Engineering, University of Thessaly, Volos

[4] Research Laboratories Operations, Khalifa University, Abu Dhabi

[5] Core Technology Platforms, New York University, Abu Dhabi

来源：

Journal of Alloys and Metallurgical Systems | 2023年 / 3卷

关键词：

Al2024; alloys; Density Functional Theory; Embrittlement; Hydrogen Entrapment; Scanning Transmission Electron Microscopy;

D O I：

10.1016/j.jalmes.2023.100026

中图分类号：

学科分类号：

摘要：

The effect of precipitate coherency in an aged aluminum (Al) 2024 alloy is investigated using scanning transmission electron microscopy (STEM) and density functional theory (DFT) methods. The focus of the study is on understanding the effects of hydrogen (H2) entrapment in the alloy, which leads to the degradation of its corrosion resistance. We employed STEM to analyze the structure and strain properties of the alloy at high spatial resolution. This has been achieved by applying the geometrical phase analysis (GPA) to the acquired HRSTEM images. The determination of strain field around the precipitates was utilized to gauge the degree of coherency at the interface of the precipitates with Al matrix. We also applied density functional theory (DFT) simulations to investigate the interfacial energy at the interfaces of the precipitates with the Al matrix. The obtained results of the DFT simulations showed that the interfacial energy at the semi-coherent precipitates was determined to be 0.06 eV per atom, which was higher compared to the coherent precipitates. Our findings suggest that the semi-coherent precipitates have a less stable interface with the Al matrix. Furthermore, the study revealed that the H2 entrapped at the semi-coherent precipitate regions exhibits a binding energy which is 3.2 eV lower than that of the coherent precipitates. This implies that hydrogen binds more strongly at the semi-coherent precipitate cites, which enhances the process of the alloy embrittlement. © 2023 The Authors

引用

共 30 条

[1]

Kamoutsi H., Et al., Corrosion-induced hydrogen embrittlement in aluminum alloy 2024, Corros. Sci., 48, 5, pp. 1209-1224, (2006)

[2]

Scamans G.M., Tuck C.D.S., Embrittlement of aluminium alloys exposed to water vapour, Proceedings of the Symposium on Environment—Sensitive Fracture of Engineering Materials, pp. 464-483, (1979)

[3]

Jones R.H., The influence of hydrogen on the stress-corrosion cracking of low-strength Al–Mg alloys, Jom—j. Miner. Met. Mater. Soc., 55, 2, pp. 42-46, (2003)

[4]

Speidel M.O., Hydrogen embrittlement and stress corrosion cracking of aluminum alloys, Hydrogen Embrittlement and Stress Corrosion Cracking, pp. 271-296, (1992)

[5]

Young G.A., Scully J.R., The effect of test temperature, temper and alloyed copper on the hydrog encontrolled crack growth rate of an Al–Zn–Mg–(Cu) alloy, Metall. Mater. Trans. A, 33, pp. 101-115, (2002)

[6]

Raina A., Deshpande V.S., Fleck N.A., Analysis of electro-permeation of hydrogen in metallic alloys, Philos. Trans. R. Soc. A: Math., Phys. Eng. Sci., 375, 2098, (2017)

[7]

Young G.A., Scully J.R., The diffusion and trapping of hydrogen in high purity aluminum, Acta Mater., 46, 18, pp. 6337-6349, (1998)

[8]

Izumi T., Itoh G., Thermal desorption spectroscopy study on the hydrogen trapping states in a pure aluminum, Mater. Trans., (2011)

[9]

Smith S.W., John R.S., The identification of hydrogen trapping states in an Al-Li-Cu-Zr alloy using thermal desorption spectroscopy, Metall. Mater. Trans. A, 31, 1, pp. 179-193, (2000)

[10]

Saitoh H., Iijima Y., Hirano K., Behaviour of hydrogen in pure aluminium, Al-4 mass% Cu and Al-1 mass% Mg 2 Si alloys studied by tritium electron microautoradiography, J. Mater. Sci., 29, 21, pp. 5739-5744, (1994)

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