Microstructure evolution in a hydrogen charged and aged Al–Zn–Mg alloy

Bendo, Artenis; Matsuda, Kenji; Lee, Seungwon; Nishimura, K.; Toda, Hiroyuki; Shimizu, Kazuyuki; Tsuru, Tomohito; Yamaguchi, Masatake

doi:10.1016/j.mtla.2018.09.035

Cited by 12 publications

(7 citation statements)

References 29 publications

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“…The computational setup for the DFT calculations is described in the methods section. The most stable interface is expected to be reached by minimizing the elastic strain energy associated with the difference in the lattice constants between the Al matrix and MgZn 2 , and is found to be the η2 interface, which is consistent with the high-resolution transmission electron microscopy (HRTEM) observations 28,29 .…”

Section: Binding Energy Of Hydrogen At Various Trap Sitessupporting

confidence: 77%

“…The volume and surface area of all the pores present in the gauge region of the prepared alloys were analysed using the marching cubes algorithm 37 , where the three-dimensional morphology of pores can be measured by synchrotron X-ray tomography. The area of the η-MgZn 2 precipitate interface was calculated from TEM observations 29 . The diameter and height of the η-MgZn 2 precipitate were observed to be approximately 20 nm and 5 nm, respectively.…”

Section: Hydrogen Partitioningmentioning

confidence: 99%

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Hydrogen-accelerated spontaneous microcracking in high-strength aluminium alloys

Tsuru

Shimizu

Yamaguchi

et al. 2020

Sci Rep

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Aluminium alloys are re-evaluated as most feasible way to satisfy the industrial needs of light-weight structural materials. However, unlike conventional structural metals such as iron and titanium, aluminium does not have easily accessible secondary phases, which means that aluminium-based alloys cannot be strengthened by harnessing multiple phases. This leaves age hardening as the only feasible strengthening approach. Highly concentrated precipitates generated by age hardening generally play a dominant role in shaping the mechanical properties of aluminium alloys. In such precipitates, it is commonly believed that the coherent interface between the matrix and precipitate does not contribute to crack initiation and embrittlement. Here, we show that this is not the case. We report an unexpected spontaneous fracture process associated with hydrogen embrittlement. The origin of this quasi-cleavage fracture involves hydrogen partitioning, which we comprehensively investigate through experiment, theory and first-principles calculations. Despite completely coherent interface, we show that the aluminium-precipitate interface is a more preferable trap site than void, dislocation and grain boundary. The cohesivity of the interface deteriorates significantly with increasing occupancy, while hydrogen atoms are stably trapped up to an extremely high occupancy over the possible trap site. Our insights indicate that controlling the hydrogen distribution plays a key role to design further highstrength and high-toughness aluminium alloys.

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Section: Binding Energy Of Hydrogen At Various Trap Sitessupporting

confidence: 77%

Section: Hydrogen Partitioningmentioning

confidence: 99%

Hydrogen-accelerated spontaneous microcracking in high-strength aluminium alloys

Tsuru

Shimizu

Yamaguchi

et al. 2020

Sci Rep

Self Cite

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“…The precipitate of this alloy has been observed to be  phase (MgZn2) by means of high-angle annular dark-field scanning transmission electron microscopy HAADF-STEM [12]. The 2 phase with a coherent interface was also observed in alloys with compositions and heat treatment histories similar to those used in this study [33,34],…”

Section: Methodsmentioning

confidence: 55%

“…( 1) has been quantified by experiments or mathematical models [13,20]. For instance, the dislocation density corresponding to the dislocation trap-site density was quantified based on the plastic strain within the alloy, computed using the microstructural tracking technique [13], and the precipitate density was quantified using a transmission electron microscope [33,34,45]. Details regarding the hydrogen partitioning calculation and quantification of the trap-site densities other than the vacancies are available elsewhere [13,20].…”

Section: Hydrogen Partitioning To Vacanciesmentioning

confidence: 99%

Influence of nanovoids in the hydrogen embrittlement fracture of Al–Zn–Mg–Cu alloys

et al. 2020

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“…However, the oxide film can be damaged in Cl --rich atmospheric environment, causing localized corrosion processes like pitting. In addition, due to the high alloy element content of Al 7XXX alloys, the formed high-density precipitated phases are enriched in a chain-like manner at the grain boundaries, resulting in significant alloy cracking, which leads to stress corrosion and reduces the service life of the components [66][67][68].…”

Section: Performance Problemsmentioning

confidence: 99%

The Advancement of 7XXX Series Aluminum Alloys for Aircraft Structures: A Review

Zhou

Liu

Zhang

2021

Metals

141

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7XXX series aluminum alloys (Al 7XXX alloys) are widely used in bearing components, such as aircraft frame, spars and stringers, for their high specific strength, high specific stiffness, high toughness, excellent processing, and welding performance. Therefore, Al 7XXX alloys are the most important structural materials in aviation. In this present review, the development tendency and the main applications of Al 7XXX alloys for aircraft structures are introduced, and the existing problems are simply discussed. Also, the heat treatment processes for improving the properties are compared and analyzed. It is the most important measures that optimizing alloy composition and improving heat treatment process are to enhance the comprehensive properties of Al 7XXX alloys. Among the method, solid solution, quenching, and aging of Al 7XXX alloys are the most significant. We introduce the effects of the three methods on the properties, and forecast the development direction of the properties, compositions, and heat treatments and the solution to the corrosion prediction problem for the next generation of Al 7XXX alloys for aircraft structures. The next generation of Al 7XXX alloys should be higher strength, higher toughness, higher damage tolerance, higher hardenability, and better corrosion resistance. It is urgent requirements to develop or invent new heat treatment regime. We should construct a novel corrosion prediction model for Al 7XXX alloys via confirming the surface corrosion environments and selecting the accurate and reliable electrochemical measurements.

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Microstructure evolution in a hydrogen charged and aged Al–Zn–Mg alloy

Cited by 12 publications

References 29 publications

Hydrogen-accelerated spontaneous microcracking in high-strength aluminium alloys

Hydrogen-accelerated spontaneous microcracking in high-strength aluminium alloys

Influence of nanovoids in the hydrogen embrittlement fracture of Al–Zn–Mg–Cu alloys

The Advancement of 7XXX Series Aluminum Alloys for Aircraft Structures: A Review

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