Enhanced age-hardening and formation of plate precipitates in Mg-Gd-Ag-Al alloy fabricated by wire-arc additive manufacturing

In this work, the microstructure of the WAAM-fabricated Mg-12.1Gd-1.6Ag-0.7Al (wt.%) alloy featured a distinct lamellar structure with alternating dendrites and equiaxed grains. The second phase contained MgAg, GdH 2, (Mg, Ag) 5 Gd and Al 2 Gd. After the solid solution treatment at 500°C for 2 h, coarse (Mg, Ag) 5 Gd phase dissolved, followed by the formation of lamellar Al 2 Gd phase. With additional aging treatment at 200°C for 24 h, dense γ′′ and β′ nano-precipitates formed in the α-Mg matrix, resulting in remarkable precipitation strengthening, namely the improved UTS of 312 ± 7.9 MPa, YS of 224 ± 5.3 MPa and EL of 4.3 ± 0.5%. This work contributes to the development of high-performance, advanced magnesium alloy workpieces.

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Publication Details

Journal
Materials Science and Technology
Published
2025-02-26
DOI
https://doi.org/10.1177/02670836251318551
Primary Topic
Magnesium Alloys: Properties and Applications
Type
article
Field-Weighted Citation Impact
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article

Enhanced age-hardening and formation of plate precipitates in Mg-Gd-Ag-Al alloy fabricated by wire-arc additive manufacturing

Shang Sui, Sergei Remennik, Yuanshen Qi, Fanhong Zeng et al.
Materials Science and Technology
Magnesium Alloys: Properties and Applications
article

Enhanced age-hardening and formation of plate precipitates in Mg-Gd-Ag-Al alloy fabricated by wire-arc additive manufacturing

Shang Sui, Sergei Remennik, Yuanshen Qi, Fanhong Zeng, Chunjie Xu, Dong Ma, Jun Tian, Can Guo, Zhaoqin Zhang, Dan Shechtman
article en

Abstract

In this work, the microstructure of the WAAM-fabricated Mg-12.1Gd-1.6Ag-0.7Al (wt.%) alloy featured a distinct lamellar structure with alternating dendrites and equiaxed grains. The second phase contained MgAg, GdH 2, (Mg, Ag) 5 Gd and Al 2 Gd. After the solid solution treatment at 500°C for 2 h, coarse (Mg, Ag) 5 Gd phase dissolved, followed by the formation of lamellar Al 2 Gd phase. With additional aging treatment at 200°C for 24 h, dense γ′′ and β′ nano-precipitates formed in the α-Mg matrix, resulting in remarkable precipitation strengthening, namely the improved UTS of 312 ± 7.9 MPa, YS of 224 ± 5.3 MPa and EL of 4.3 ± 0.5%. This work contributes to the development of high-performance, advanced magnesium alloy workpieces.

Materials Science and Technology
Technion – Israel Institute of Technology (IL), Hebrew University of Jerusalem (IL), Xi’an University (CN), Xi'an University of Technology (CN), Guangdong Technion-Israel Institute of Technology (CN), Institute of New Materials (CN)
National Natural Science Foundation of China, Natural Science Foundation of Guangdong Province, Natural Science Basic Research Program of Shaanxi Province
Clean water and sanitation
Openalex Percentile: Top 98%
Magnesium Alloys: Properties and Applications
DOIOpen Access PDFOpenAlex
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