Evolution of Subgrains, Dislocations, and Mechanical Properties in a 2524Al Alloy during High-Strain Rate Rolling

Sun, Yi-Fei; Hu, Yijie; Wang, S. H.; He, Jiangmei; Yang, Chao; Zhai, Chun-peng

doi:10.1007/s11665-021-06319-6

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…AA2524 is widely used in aircraft structural parts and skin owing to its high strength, low density, high damage tolerance, and fracture toughness [1][2][3][4][5]. Conventional high-strength AA2524 plates are typically prepared using rolling and heating treatments [5,6]. The strength of the plate can be improved by the substructure, high-density dislocation entanglement, and a diffuse and fine precipitated phase [6].…”

Section: Introductionmentioning

confidence: 99%

“…Conventional high-strength AA2524 plates are typically prepared using rolling and heating treatments [5,6]. The strength of the plate can be improved by the substructure, high-density dislocation entanglement, and a diffuse and fine precipitated phase [6]. However, a high-density substructure leads to a decrease in ductility, and the high-density texture generated during rolling is not conducive to anisotropy [1,6].…”

Section: Introductionmentioning

confidence: 99%

“…The strength of the plate can be improved by the substructure, high-density dislocation entanglement, and a diffuse and fine precipitated phase [6]. However, a high-density substructure leads to a decrease in ductility, and the high-density texture generated during rolling is not conducive to anisotropy [1,6]. Grain refinement is an important method for improving the alloy strength.…”

Section: Introductionmentioning

confidence: 99%

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Effect of single-pass friction stir processing parameters on the microstructure and properties of 2 mm thick AA2524

Sun

et al. 2022

Mater. Res. Express

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Friction stir processing (FSP) is an important method for obtaining fine grains. To determine the effects of FSP and processing parameters on the microstructure and mechanical properties of rolled sheets, we performed single-pass FSP of a 2 mm thick 2524 aluminium alloy (AA2524) rolled sheet by comparing the combination of different processing parameters. The results show that lamellar grains (rolled state) are replaced by fine dynamic recrystallisation in the stir zone (SZ), and more Al2CuMg phases are precipitated simultaneously. As the rotation speed increases, the grain size and width of the pin stir zone (PSZ) increase, the microhardness first decreases and then increases; with the traverse speed increase, the grain size first decreases and then increases, and the width of the PSZ and microhardness decrease. The SZ has the smallest grain size, highest high-angle grain boundaries (HAGBs, with misorientation angles (θ) >15°) ratio, and largest ultimate tensile strength (UTS), when the rotation and traverse speed were 1000 r·min-1 and 125 mm·min-1, are 1.59 ± 0.82 µm, 0.91 and 451.23 ± 0.52 MPa, respectively, and the elongation to fracture is 13%. The UTS and elongation were only 95.12% and 98.48% of those of the base metals (BM), respectively, because of the significant decrease in the dislocation density. Fracture analysis revealed ductile fracture of the joint due to the large number of dimples and fine second-phase particles.

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