Effect of two-stage overaging on microstructure and corrosion properties of an Al–Zn–Mg–Cu alloy

Cheng, Quanshi; Ye, Lingying; Huang, Qingmei; Dong, Yu; Liu, Shengdan

doi:10.1016/j.jmrt.2022.08.098

Cited by 15 publications

(3 citation statements)

References 47 publications

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“…Therefore, applying 7xxx series alloys makes it feasible to develop products surpassing the mechanical properties of conventional stainlesssteel products, making them viable alternatives. However, one crucial consideration is the issue of corrosion resistance in 7xxx series alloys [12,13]. Fortunately, for leisure boat propellers, which are consumables, it is presumed that this issue can be somewhat mitigated through surface treatments such as anodizing when moving away from Al-Si alloys [14,15].…”

Section: Introductionmentioning

confidence: 99%

Development of Low-Pressure Die-Cast Al−Zn−Mg−Cu Alloy Propellers—Part Ⅰ: Hot Tearing Simulations for Alloy Optimization

Kim,

Kim

2024

Materials

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Recent advances in the leisure boat industry have spurred demand for improved materials for propeller manufacturing, particularly high-strength aluminum alloys. While traditional Al-Si alloys like A356 are commonly used due to their excellent castability, they have limited mechanical properties. In contrast, 7xxx series alloys (Al−Zn−Mg−Cu based) offer superior mechanical characteristics but present significant casting challenges, including hot-tearing susceptibility (HTS). This study investigates the optimization of 7xxx series aluminum alloys for low-pressure die-casting (LPDC) processes to enhance propeller performance and durability. Using a constrained rod-casting (CRC) method and finite element simulations, we evaluated the HTS of various alloy compositions. The results indicate that increasing Zn and Cu contents generally increase HTS, while a sufficient Mg content of 2 wt.% mitigates this effect. Two optimized quaternary Al−Zn−Mg−Cu alloys with relatively low HTS were selected for LPDC propeller production. Simulation and experimental results demonstrated the effectiveness of the proposed alloy compositions, highlighting the need for further process optimization to prevent hot tearing in high Mg and Cu content alloys.

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Section: Introductionmentioning

confidence: 99%

Development of Low-Pressure Die-Cast Al−Zn−Mg−Cu Alloy Propellers—Part Ⅰ: Hot Tearing Simulations for Alloy Optimization

Kim,

Kim

2024

Materials

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“…In the first stage of two-stage aging, a large number of fine and uniformly distributed precipitates are formed in the matrix. Then, in the second aging stage, the precipitates rapidly coarsen in a high-temperature environment and exhibit a discontinuous distribution state [16], which effectively reduces the sensitivity to stress corrosion cracking of the alloy and improves fracture toughness at the cost of losing a certain amount of strength [11,12]. The RRA process was proposed to compensate for the shortcomings of the T6 and T7X processes, which can balance high strength and good corrosion resistance, but the process is more complex and has a longer cycle [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Impact of Aging Treatment on Microstructure and Performance of Al-Zn-Mg-Cu Alloy Thin Sheets

Li,

Zhang,

Zhang

et al. 2023

Metals

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Al-Zn-Mg-Cu alloy, recognized for its heat-treatable and super-high strength, is a pivotal material for critical structural components in aviation. Consequently, grasping the intricate relationship between heat treatment processes and the microstructural characteristics and properties of the Al-Zn-Mg-Cu alloy is of paramount practical significance. This study encompasses a spectrum of heat treatment methodologies, delving into the diverse effects of distinct aging treatments on the microstructure and performance of thin Al-Zn-Mg-Cu alloy sheets. The findings illuminate that short natural aging treatments bestow heightened strength and hardness upon the alloy, albeit at the expense of ductility. Nevertheless, the alloy retains commendable malleability, enabling significant cold deformation. In contrast, artificial aging markedly elevates the alloy’s strength and hardness, albeit concurrently inducing a precipitous decline in ductility, thereby attenuating the alloy’s cold formability.

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“…Due to the high zinc content in 7085 aluminum alloy, η(MgZn 2 ) is the grain boundary precipitate [16,17]. The distribution and morphology of the η phase are sensitive to IGC [18][19][20][21]. Thus, it is necessary to evaluate the effects of precipitates after plastic deformation and heat treatment on mechanical properties and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Effects of hot deformation on microstructure evolution, hardness, and intergranular corrosion of 7085 aluminum alloy sheets

Wu¹,

Kai²,

Guan³

et al. 2023

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In this work, slabs of 7085 aluminum alloy were fabricated by electromagnetic stirring and solidifying with copper mold and suffered hot plastic deformation. The straight hot rolling process was used when the slabs were preheated to 420 • C for 1 h. The thicknesses of 1-, 2-, and 3-mm sheets correspond to the thickness reduction rate of 92, 83, and 75 % of original rectangular slabs. The microstructure results show that hot rolling deformation crushes the remanent phases into small sizes, leads particles into homogeneous distribution, and changes the dendritic grain into a fiber structure. The recrystallization rate decreases with the final sheet thickness increase after heat treatment. The recrystallization is strictly restricted when the thickness reduction rate approaches 92 %. EBSD results provide a unique perspective to view grain and dislocation evolution and texture change in different tempers of sheets. The hardness and intergranular corrosion (IGC) performance show that hardness is reduced while the corrosion depth is aggravated by the rise of sheet thickness. The maximum hardness is 86.75 HRB, and the minimum corrosion depth is only 9.17 µm in the 1-mm sheet. The effects of grain boundary precipitates (GBPs), recrystallization, and precipitate-free zone (PFZ) on hardness and IGC were studied.

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Effect of two-stage overaging on microstructure and corrosion properties of an Al–Zn–Mg–Cu alloy

Cited by 15 publications

References 47 publications

Development of Low-Pressure Die-Cast Al−Zn−Mg−Cu Alloy Propellers—Part Ⅰ: Hot Tearing Simulations for Alloy Optimization

Development of Low-Pressure Die-Cast Al−Zn−Mg−Cu Alloy Propellers—Part Ⅰ: Hot Tearing Simulations for Alloy Optimization

Impact of Aging Treatment on Microstructure and Performance of Al-Zn-Mg-Cu Alloy Thin Sheets

Effects of hot deformation on microstructure evolution, hardness, and intergranular corrosion of 7085 aluminum alloy sheets

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