Effect of solution treatment temperature on grain boundary composition and environmental hydrogen embrittlement of an Al–Zn–Mg–Cu alloy

Moshtaghi, Masoud; Safyari, Mahdieh; Hojo, Tomohiko

doi:10.1016/j.vacuum.2020.109937

Cited by 28 publications

(12 citation statements)

References 26 publications

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“…Therefore, it could qualitatively describe the degree of grain boundary deformation and local dislocation density distribution. [ 4 ] It can be seen from Figure 3a that dislocation density decreased significantly to a very low level after homogenization treatment. Subsequently, many dislocations gradually accumulated inside samples after hot compression, and the dislocation density increased with increasing strain rate.…”

Section: Resultsmentioning

confidence: 99%

“…

Al-Zn-Mg-Cu alloys have been extensively used in a variety of structural applications, including vehicles, load-bearing parts of aircraft such as undercarriages, rods of transport vehicles, heat exchange pipes of large radiators, and pressure vessels of fire-fighting equipment due to their high specific stiffness and excellent corrosion resistance. [1][2][3][4][5] At present, high-performance aluminum alloys are urgently expected because of the improved requirements in the lightweight materials for safety and reliability. In this case, Al-Zn-Mg-Cu alloys have attracted extensive attention from researchers.

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mentioning

confidence: 99%

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The Dynamic Recrystallization in a Hot‐Compressed Al–Zn–Mg–Cu–Sc–Zr Alloy: The Role of Strain Rate

Zhao,

Huang,

Chen

et al. 2023

Adv Eng Mater

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The effects of strain rates (0.001–1 s−1) on the microstructures and mechanical performance of the novel Al–Zn–Mg–Cu alloy through hot compression at 300 °C are investigated in detail. With the increase of strain rate, the dislocation density increases from 0.06 × 1013 to 3.77 × 1013 m−2, which promotes the dynamic precipitation kinetics. And the volume fraction of η precipitates is calculated by the differential scanning calorimetry curves increasing from 1.36% to 3.94%. Both dislocations and precipitates promote to increase the hardness of the Al–Zn–Mg–Cu alloy. The large number of η precipitates in high‐strain‐rate samples hinders the recrystallization process by impeding the movement of dislocations and grain boundaries, decreasing the volume fraction of recrystallized grains to 3.1%. Continuous/discontinuous dynamic recrystallization occurs preferentially at low strain rates, and discontinuous dynamic recrystallization is rarely observed in high‐strain‐rate samples. In addition, because the process of continuous dynamic recrystallization promotes the transformation from low‐angle grain boundaries to high‐angle grain boundaries, more continuous dynamic recrystallized grains and less low‐angle grain boundaries can be observed in low‐strain‐rate samples.

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Section: Resultsmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

The Dynamic Recrystallization in a Hot‐Compressed Al–Zn–Mg–Cu–Sc–Zr Alloy: The Role of Strain Rate

Zhao,

Huang,

Chen

et al. 2023

Adv Eng Mater

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“…In general, after high-temperature solution treatment, alloys contain a high concentration of unstable vacancies, which diffuse to the grain boundaries. Since there is high affinity between vacancies and solute atoms [ 42 ], there also exists the solute diffusion accompanied by vacancies, which can explain the lack of solutes inside.…”

Section: Resultsmentioning

confidence: 99%

Modulation of Multiple Precipitates for High Strength and Ductility in Al-Cu-Mn Alloy

Liu

Wang

et al. 2021

Materials

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The category and morphology of precipitates are essential factors in determining the mechanical behaviors of aluminum alloys. It is a great challenge to synthetically modulate multiple precipitates to simultaneously improve strength and ductility. In the present work, by optimizing the precipitations of the GP zone, θ’-approximant and θ’ phase for an Al-Cu-Mn alloy, a high tensile strength of 585 MPa with large elongation of 12.35% was achieved through pre-deformation and aging. The microstructure evolution pattern was revealed by detailed characterizations of scanning electron microscopy and transmission electron microscopy. It was found that such high tensile strength of the samples was due to a combination of strengthening by the high density of dispersive fine precipitates and dislocations, and the high elongation to failure was primarily attributed to the multimodal precipitates and elimination of precipitation-free zones along the grain boundaries. The strategy proposed here is a promising way of preparing ultra-strong Al-Cu-Mn alloys.

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“…However, at present, the commonly used welding methods in engineering are suitable for 2219 aluminum alloy [39,40]. In addition, the 7xxx aluminum alloy with plastic decline or hydrogen induced brittleness in a liquid hydrogen environment is not suitable for making liquid hydrogen tanks [41][42][43].…”

Section: Properties Of Aluminum Alloy For Liquid Hydrogen Storage And...mentioning

confidence: 99%

Research Progress of Cryogenic Materials for Storage and Transportation of Liquid Hydrogen

Qiu

Yang²,

Tong

et al. 2021

Metals

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Liquid hydrogen is the main fuel of large-scale low-temperature heavy-duty rockets, and has become the key direction of energy development in China in recent years. As an important application carrier in the large-scale storage and transportation of liquid hydrogen, liquid hydrogen cryogenic storage and transportation containers are the key equipment related to the national defense security of China’s aerospace and energy fields. Due to the low temperature of liquid hydrogen (20 K), special requirements have been put forward for the selection of materials for storage and transportation containers including the adaptability of materials in a liquid hydrogen environment, hydrogen embrittlement characteristics, mechanical properties, and thermophysical properties of liquid hydrogen temperature, which can all affect the safe and reliable design of storage and transportation containers. Therefore, it is of great practical significance to systematically master the types and properties of cryogenic materials for the development of liquid hydrogen storage and transportation containers. With the wide application of liquid hydrogen in different occasions, the requirements for storage and transportation container materials are not the same. In this paper, the types and applications of cryogenic materials commonly used in liquid hydrogen storage and transportation containers are reviewed. The effects of low-temperature on the mechanical properties of different materials are introduced. The research progress of cryogenic materials and low-temperature performance data of materials is introduced. The shortcomings in the research and application of cryogenic materials for liquid hydrogen storage and transportation containers are summarized to provide guidance for the future development of container materials. Among them, stainless steel is the most widely used cryogenic material for liquid hydrogen storage and transportation vessel, but different grades of stainless steel also have different applications, which usually need to be comprehensively considered in combination with its low temperature performance, corrosion resistance, welding performance, and other aspects. However, with the increasing demand for space liquid hydrogen storage and transportation, the research on high specific strength cryogenic materials such as aluminum alloy, titanium alloy, or composite materials is also developing. Aluminum alloy liquid hydrogen storage and transportation containers are widely used in the space field, while composite materials have significant advantages in being lightweight. Hydrogen permeation is the key bottleneck of composite storage and transportation containers. At present, there are still many technical problems that have not been solved.

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Effect of solution treatment temperature on grain boundary composition and environmental hydrogen embrittlement of an Al–Zn–Mg–Cu alloy

Cited by 28 publications

References 26 publications

The Dynamic Recrystallization in a Hot‐Compressed Al–Zn–Mg–Cu–Sc–Zr Alloy: The Role of Strain Rate

The Dynamic Recrystallization in a Hot‐Compressed Al–Zn–Mg–Cu–Sc–Zr Alloy: The Role of Strain Rate

Modulation of Multiple Precipitates for High Strength and Ductility in Al-Cu-Mn Alloy

Research Progress of Cryogenic Materials for Storage and Transportation of Liquid Hydrogen

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