Influence of cooling rate after homogenization on microstructure and mechanical properties of aluminum alloy 7050

Liu, S. D.; Yuan, Yubao; Li, C. B.; You, Jiang-hai; Zhang, X. M.

doi:10.1007/s12540-012-4016-9

Cited by 28 publications

(12 citation statements)

References 12 publications

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“…No precipitate phase exists in the crystal (Figure 7e). Due to the higher cooling rate, the precipitation phase accumulated at the grain boundary, so that the fracture was more likely to occur during stretching process [26,27].…”

Section: Influence Of Different Cooling Rates On the Micro-structure mentioning

confidence: 99%

Effect of Cooling Rate on Microstructure and Properties of Twin-Roll Casting 6061 Aluminum Alloy Sheet

Wang

et al. 2020

Metals

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In this study, a twin-roll casting sheet of 6061 aluminum alloy was cooled using furnace, asbestos, air, wind and water. The effect of cooling rate on the microstructure and properties of twin-roll casting 6061 aluminum alloy sheet were studied. Optical microscope, scanning electron microscope, X-ray diffraction, microhardness tester and universal tensile machine were used to observe the microstructure and properties of twin-roll casting sheet of 6061 aluminum alloy. The results show that the higher the cooling rate, the smaller the grain size of the alloy and the smaller the number of precipitated phases in the matrix. Uniform grain size of the alloy could be obtained at a stable cooling rate. The hardness, tensile strength and elongation of the twin-roll casting sheet increased with cooling rate. Under wind cooling condition, the twin-roll casting sheet demonstrated excellent comprehensive performance, i.e., 88 MPa of yield strength, 178 MPa of tensile strength and 15% of elongation, respectively. A quantitative Hall–Petch relation was established to predict the yield strength of 6061 twin-roll casting sheets with different grain sizes and cooling rate.

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Section: Influence Of Different Cooling Rates On the Micro-structure mentioning

confidence: 99%

Effect of Cooling Rate on Microstructure and Properties of Twin-Roll Casting 6061 Aluminum Alloy Sheet

Wang

et al. 2020

Metals

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“…6(a). It is a partial recrystallized microstructure that is quite typical in Al-Zn-Mg-Cu-Zr alloy sheets and plates after solution heat treatment and aging [21]. Most recrystallized grains are white and elongated along the rolling direction, while unrecrystallized grains tend to be dark.…”

Section: Exfoliation Corrosionmentioning

confidence: 99%

“…The hardness is primarily dependent on the precipitation structure in the matrix [1,9,21,22], while the resistance to exfoliation corrosion is primarily associated with the microstructural and microchemical features of GBs [5,13,14]. According to the above results, thin foils at three different positions in the end-quenched and aged specimen, i.e., 5 mm (~1700°C /min), 32 mm (~300°C/min), and 100 mm (~100°C/min), from the water-cooled end were prepared and examined using STEM to investigate these features.…”

Section: Stem-haadf Imagesmentioning

confidence: 99%

Critical quenching rate for high hardness and good exfoliation corrosion resistance of Al-Zn-Mg-Cu alloy plate

Yin

Yue

et al. 2016

Met. Mater. Int.

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By means of the end-quenching technique, we investigated the relationship between quenching rate and hardness as well as exfoliation corrosion rating for Al-2.21 Zn-3.59 Mg-0.45 Cu-0.038 Zr (at%) alloy plate. In order to achieve an exfoliation corrosion rating of P or EA, the quenching rate must be greater than approximately 460°C/min and 300°C/min, respectively, and the drop degree in hardness should simultaneously be lower than approximately 2.0% and 3.5%, respectively. The results of microstructural and microchemical examination using a scanning transmission electron microscope indicate that a lower quenching rate leads to a higher content of Zn, Mg, and Cu in the grain-boundary particles and a greater width of precipitate-free zones near grain boundaries; therefore, grain-boundary particles with Zn and Mg contents less than approximately 13.39% and 10.23% (at%), respectively, and precipitate-free zones near grain boundaries with widths less than about 107 nm can contribute to an exfoliation corrosion rating better than EA. The amount of quench-induced η-phase particles, which lead to lower hardness, increases with decreasing quenching rate, and the area fraction of these particles is approximately 2.9% at a quenching rate of 300°C/min.

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“…In the unrecrystallized grains, a number of small equiaxed subgrains could be observed. Some black coarse particles of S phase and Al 7 Cu 2 Fe phase were seen and primarily located in the recrystallized regions, which may indicate particle stimulated nucleation (PSN) mechanism of recrystallization [55,56]. With the decrease of quench rate, it became more and more difficult to reveal grain structure clearly after etching due to a number of quenchinduced h phase particles, see Fig.…”

Section: Microstructure and Grain Boundary Microchemistrymentioning

confidence: 99%

Influence of grain structure on quench sensitivity relative to localized corrosion of high strength aluminum alloy

Liu

Deng

et al. 2015

Materials Chemistry and Physics

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Influence of cooling rate after homogenization on microstructure and mechanical properties of aluminum alloy 7050

Cited by 28 publications

References 12 publications

Effect of Cooling Rate on Microstructure and Properties of Twin-Roll Casting 6061 Aluminum Alloy Sheet

Effect of Cooling Rate on Microstructure and Properties of Twin-Roll Casting 6061 Aluminum Alloy Sheet

Critical quenching rate for high hardness and good exfoliation corrosion resistance of Al-Zn-Mg-Cu alloy plate

Influence of grain structure on quench sensitivity relative to localized corrosion of high strength aluminum alloy

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