Two-stage homogenization of Al-Zn-Mg-Cu-Zr alloy processed by twin-roll casting to improve L12 Al3Zr precipitation, recrystallization resistance, and performance

Li, Yong; Lü, Bing; Wei, Yu; Fu, Jinyu; Xu, Guangming; Wang, Zhaodong

doi:10.1016/j.jallcom.2021.160789

Cited by 34 publications

(12 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The corrosion preferentially propagates along the recrystallized grain boundaries shown in Fig. 7e [29]. Figures 6b,d,f exhibit the morphology and distribution of matrix precipitates and GBPs on different thickness sheets.…”

Section: Igc Performancementioning

confidence: 94%

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

Wu¹,

Kai²,

Guan³

et al. 2023

View full text Add to dashboard Cite

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.

show abstract

Section: Igc Performancementioning

confidence: 94%

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

Wu¹,

Kai²,

Guan³

et al. 2023

View full text Add to dashboard Cite

show abstract

“…For instance, Fang and co‐workers [ 9 ] found intergranular fracture and corrosion resistance increased as recrystallization decreased. Wang [ 10 ] and Li [ 11 ] also discovered that the subgrain boundary was more sensitive to corrosion. Hence, it is necessary to control the recrystallization fraction throughout a series of processing steps, [ 12,13 ] such as homogenization treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Hitherto, numerous researches indicated that ideal Al 3 Zr dispersoids and dispersion distribution were obtained after double‐step homogenization treatment in 5xxx, [ 23 ] 7xxx, [ 11,24,25 ] and 2xxx [ 26,27 ] series alloys. For example, Wang [ 14 ] and Guo [ 15 ] both investigated the difference in precipitation feature of Al 3 Zr and its impact on recrystallization resistance between single‐ and double‐step homogenization in 2195 alloy.…”

Section: Introductionmentioning

confidence: 99%

“…[17,18] According to investigations, [19][20][21] denser, finer, and more desirable distribution of L1 2 -structure Al 3 Zr dispersoids can efficiently enhance the recrystallization resistance during subsequent thermomechanical processes. [22] Hitherto, numerous researches indicated that ideal Al 3 Zr dispersoids and dispersion distribution were obtained after double-step homogenization treatment in 5xxx, [23] 7xxx, [11,24,25] and 2xxx [26,27] series alloys. For example, Wang [14] and Guo [15] both investigated the difference in precipitation feature of Al 3 Zr and its impact on recrystallization resistance between single-and double-step homogenization in 2195 alloy.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Precipitation of Al₃Zr Dispersoids under Various Homogenization and Its Effect on Recrystallization in 2198 Al–Cu–Li Alloy

Xun,

Li,

Wen

et al. 2023

Adv Eng Mater

View full text Add to dashboard Cite

In this research, the precipitation of Al3Zr during one‐ and two‐step homogenization processes is studied by the transmission electron microscopy (TEM) method, and its effect on recrystallization is investigated by the electron backscattering diffraction (EBSD) technique after the same hot compression and solution treatment, respectively. The results show that when the temperature reaches 430°C, just some small Al3Zr dispersoids are visible in samples that undergone one‐step treatment. As the first‐step homogenization temperature increased from 365°C to 430°C, the size of the Al3Zr particle increases from 9.4 nm to 19.1 nm while the number density decreases rapidly from 1201 μm‐3 to 183 μm‐3. In addition, the average radius of Al3Zr increases to 22.1 nm while the number density decreased to 76 μm‐3 when the sample is homogenized at 500°C/24h. After a double‐step homogenization with decreased first‐step temperature, lower recrystallization fraction is obtained. Therefore, the optimal homogenization treatment is determined to be 365°C/16h + 500°C/24h, after which the most desirable Al3Zr distribution and the smallest recrystallization fraction are obtained during thermomechanical processing. This result can provide a more appropriate parameter for homogenization treatment in order to achieve a more dispersed distribution, which will result in stronger pinning force during the thermomechanical process.This article is protected by copyright. All rights reserved.

show abstract

“…In addition, Al 3 (Sc, Zr) particles further enhanced the strength of materials by hindering dislocation movement. [10,11] On the other hand, the microstructures and mechanical performance of Al-Zn-Mg-Cu alloys were highly dependent on the processing parameters and service conditions. With the application of Al-Zn-Mg-Cu alloy more and more widely, the influence of processing parameters and service conditions on its microstructure and properties deserved more in-depth study, such as hot processing properties, multistage hot forging, extrusion, automobile crash, and the bird hit the fuselage or wings of the aircraft during flight.…”

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

View full text Add to dashboard Cite

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.

show abstract

Two-stage homogenization of Al-Zn-Mg-Cu-Zr alloy processed by twin-roll casting to improve L12 Al3Zr precipitation, recrystallization resistance, and performance

Cited by 34 publications

References 37 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

Precipitation of Al₃Zr Dispersoids under Various Homogenization and Its Effect on Recrystallization in 2198 Al–Cu–Li Alloy

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

Contact Info

Product

Resources

About

Two-stage homogenization of Al-Zn-Mg-Cu-Zr alloy processed by twin-roll casting to improve L12 Al3Zr precipitation, recrystallization resistance, and performance

Cited by 34 publications

References 37 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

Precipitation of Al3Zr Dispersoids under Various Homogenization and Its Effect on Recrystallization in 2198 Al–Cu–Li Alloy

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

Contact Info

Product

Resources

About

Precipitation of Al₃Zr Dispersoids under Various Homogenization and Its Effect on Recrystallization in 2198 Al–Cu–Li Alloy