Tailoring precipitation of directed energy deposited Al-Cu alloy via laser shock peening

Chang, Tianxing; Zhang, Hongkai; Fang, Xuewei; Jing, Yandong; Xi, Naiyuan; Huang, Ke

doi:10.1016/j.addma.2023.103652

Cited by 1 publication

(1 citation statement)

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“…The medium grain size of this study should be explained by the fact that the cooling rate of the centimeter-scale molten pool developed by the wire-arc DED is intermediate between that of the decimeter-scale melt pool of the conventional casting and the millimeter-scale melt pool of L-DED [9,50]. Although the variation in cooling rate did not change the type of eutectic phase, the volume fraction and size of the β-Mg 24 (Gd, Y) 5 formed by the AM process is smaller than those of the conventional casting process.…”

Section: Unique Microstructure Of Wire-arc Dedmentioning

confidence: 96%

Revealing precipitation behavior and mechanical response of wire-arc directed energy deposited Mg-Gd-Y-Zr alloy by tailoring aging procedures

Li,

Fang,

Zhang

et al. 2024

Int. J. Extrem. Manuf.

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Mg-Gd-Y-Zr alloy, as a typical magnesium rare-earth (Mg-RE) alloy, is gaining popularity in the advanced equipment manufacturing fields owing to their noticeable age-hardening properties and high specific strength. However, it is extremely challenging to prepare wrought components with large dimensions and complex shapes because of the poor room-temperature processability of Mg-Gd-Y-Zr alloy. Herein, we report a wire-arc directed energy deposited (DED) Mg-10.45Gd-2.27Y-0.52Zr (wt.%, GW102K) alloy with high RE content presenting prominent combination of strength and ductility, realized by tailored nanoprecipitates enabled by optimized heat treatment procedures. Specifically, the solution-treated sample exhibits excellent ductility with an elongation (EL) of 14.6 ± 0.1%, while the aging-treated sample at 200 ℃ for 58h achieves an ultra-high ultimate tensile strength (UTS) of 371 ± 1.5 MPa. Besides, the aging-treated sample at 250 ℃ for 16h attains a good strength-ductility synergy with an UTS of 316 ± 2.1 MPa and an EL of 8.5 ± 0.1%. Particularly, the evolution mechanisms of precipitation response induced by various aging parameters and deformation behavior caused by nanoprecipitates type were also systematically revealed. The excellent ductility resulted from coordinating localized strains facilitated by active slip activity, the ultra-high strength should be ascribed to the dense nano-β' hampering dislocation motion, while the shearable nano-β1 contributed to the good strength-ductility synergy. This work thus offers insightful understanding into the nanoprecipitates manipulation and performance tailoring for the wire-arc DED preparation of large-sized Mg-Gd-Y-Zr component with complex geometries.

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Section: Unique Microstructure Of Wire-arc Dedmentioning

confidence: 96%