Effect of cryorolling and ageing on the microstructure and mechanical properties of Al 7085 alloy

Zhang, S.; Luo, Xuan; Zheng, Guo; Zhai, Naihua; Yang, Yanqing; Li, P.T.

doi:10.1016/j.msea.2021.142482

Cited by 23 publications

(6 citation statements)

References 43 publications

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“…The change of preferred grain orientation is mainly caused by recrystallization behavior. Plenty of dislocations are stored in the [111] orientation grains, and the driving force for recrystallization is relatively high; thus the [111] orientation grains are preferential recrystallization, and eventually, a large number of recrystallized grains nucleate and grow in the region [14].…”

Section: Chemical Composition Of 7085 Alloymentioning

confidence: 99%

“…As known to us, 7085 alloy is a highly high-strength alloy with a certain toughness, and its main application is structural parts for aviation and molding for cavities [12,13]. To expand its application scope, severe plastic deformation (SPD) techniques such as hot rolling, cryo rolling, and hot forging have been used to improve mechanical properties [14,15]. These plastic deformations result in microstructure homogenization along the deformation direction and high dislocation density, which can become the nucleation sites for the precipitate.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Chemical Composition Of 7085 Alloymentioning

confidence: 99%

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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“…The 7000 series aluminum alloys (Al-Zn-Mg-Cu) are widely used as structural materials in aerospace and transportation fields due to their high strengths, low densities, excellent toughness, and good corrosion resistance [1][2][3][4][5]. The series of aluminum alloys are aging strengthened aluminum alloys, and their strengths primarily depend on the types and sizes of precipitates [4,6,7].…”

Section: Introductionmentioning

confidence: 99%

Effect of precipitates evolution on mechanical properties of Al 7050 alloy during secondary aging

Wang

Ren

et al. 2023

Mater. Res. Express

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The microstructure and mechanical properties were investigated in Al 7050 alloy after aging treatments. Results showed that refining the η′ precipitates and increasing the proportion of the η′ precipitates significantly improved its mechanical properties. High density dislocations created by cold deformation promoted the nucleation of the main strengthening η′ phase during aging. High-density fine precipitates was created, which increases the yield strength. However, the strength of the deformed sample decreased by ~31.6 % after the secondary aging at 157 °C, with more degradation than other samples. Microstructure study presented that some precipitates were composed of two distinctive areas. An in-situ transformation from a simple triclinic Mg2Zn3 to the η phase (MgZn2) was observed during the secondary aging. The loss in strength after secondary aging at 157 °C proved that the η′ precipitates transformed into the η precipitates by absorbing solute atoms at a temperature lower than equilibrium precipitation temperature of η precipitates. The residual high-density dislocations in the cold-deformed samples promoted the diffusion of solute atoms, which accelerated the η′→η transformation during the secondary aging. Significant reduction in the volume of η′ precipitations led to the rapid deterioration of mechanical properties.

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“…7xxx series aluminum alloys have been widely applied in the aviation and aerospace industry due to their excellent properties, such as a low density, high specific strength, good processing performance, and so on [ 1 , 2 , 3 ]. Among 7xxx series aluminum alloy, 7085 alloy possesses an outstanding and advantageous status because of an extra-good corrosion resistance and low quenching sensitivity [ 4 , 5 , 6 ]. Thus, many studies have focused on its microstructure and mechanical properties [ 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior and Mechanical Performance of 7085 Aluminum Alloy in a Humid and Hot Marine Atmosphere

Tao¹,

Xiang²,

Zhang³

et al. 2022

Materials

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This work analyzed changes in the corrosion morphology and mechanical performance of 7085 aluminum alloy after outdoor exposures for different times in a humid and hot marine atmospheric environment. After one month of exposure, a pronounced corrosion of the alloy was observed. The corrosion product was mainly Al(OH)3, and the corrosion features were mainly pitting corrosion and intergranular corrosion (IGC). With the exposure time extended from 6 months to 12 months, the IGC depth increased from 114 μm to 190 μm. After a 1-year outdoor exposure in a humid and hot marine environment, the alloy’s ultimate strength and yield stress remained nearly unchanged, while its elongation and area reduction decreased from the original 6% and 9%, respectively, to 3% and 5%. Moreover, the reasons for IGC and its effect on the mechanical performance was analyzed.

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Effect of cryorolling and ageing on the microstructure and mechanical properties of Al 7085 alloy

Cited by 23 publications

References 43 publications

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

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

Effect of precipitates evolution on mechanical properties of Al 7050 alloy during secondary aging

Corrosion Behavior and Mechanical Performance of 7085 Aluminum Alloy in a Humid and Hot Marine Atmosphere

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