International Journal of Extreme Manufacturing, Volume. 6, Issue 4, 45001(2024)

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

Li Xinzhi... Fang Xuewei, Zhang Zhiyan, Ghafoor Shahid, Chen Ruikai, Liu Yi, Tang Kexin, Li Kai, Ma Minghua, Shang Jiahao and Huang Ke |Show fewer author(s)

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 its 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 a prominent combination of strength and ductility, realized by tailored nanoprecipitates through an optimized heat treatment procedure. Specifically, the solution-treated sample exhibits excellent ductility with an elongation (EL) of (14.6 ± 0.1)%, while the aging-treated sample at 200 °C for 58 h achieves an ultra-high ultimate tensile strength (UTS) of (371 ± 1.5) MPa. Besides, the aging-treated sample at 250 °C for 16 h attains a good strength-ductility synergy with a UTS of (316 ± 2.1) MPa and a 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. And the ultra-high strength should be ascribed to the dense nano-β′ hampering dislocation motion. Additionally, 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 components with complex geometries.

Tools

Get Citation

Copy Citation Text

Li Xinzhi, Fang Xuewei, Zhang Zhiyan, Ghafoor Shahid, Chen Ruikai, Liu Yi, Tang Kexin, Li Kai, Ma Minghua, Shang Jiahao, Huang Ke. Revealing precipitation behavior and mechanical response of wire-arc directed energy deposited Mg-Gd-Y-Zr alloy by tailoring aging procedures[J]. International Journal of Extreme Manufacturing, 2024, 6(4): 45001

Download Citation

EndNote(RIS)BibTexPlain Text
Save article for my favorites
Paper Information

Category:

Received: Nov. 6, 2023

Accepted: Dec. 25, 2024

Published Online: Dec. 25, 2024

The Author Email:

DOI:10.1088/2631-7990/ad35fd

Topics