TY  - JOUR
AU  - Li, Jiamin
AU  - Huang, Meng
AU  - Hou, Juan
AU  - Wang, Xingbin
AU  - Xu, Gaopeng
AU  - Yang, Yi
AU  - Mo, Ning
AU  - Shi, Yun
AU  - Zhang, Laichang
AU  - Tang, Weineng
PY  - 2025
TI  - Excellent strength-ductility synergy property of wire-arc additively manufactured Mg-Gd-Y-Zr alloy investigated by heat treatment
JO  - Journal of Magnesium and Alloys
SN  - 2213-9567
SP  - 3673
EP  - 3688
VL  - 13
IS  - 8
AB  - In this work, the GW63K (Mg-6.54Gd-3.93Y-0.41Zr, wt.%) alloy wire was utilized as the feedstock material and the thin-walled component was fabricated using wire-arc additive manufacturing technology (WAAM). The microstructural evolution during deposition and subsequent heat treatment was explained through multi-scale microstructural characterization techniques, and the impact of heat treatment on the strength-ductility synergy of the deposited alloy was systematically compared. The results showed that the microstructure of the deposited sample was mainly composed of fine equiaxed α-Mg grains and Mg24(Gd,Y)5 phase. The optimized solution heat treatment (450 °C × 2 h) had little effect on the grain size, but can effectively reduce the Mg24(Gd,Y)5 eutectic phase on the grain boundary, resulting in a significant increase in elongation from 13.7% to 26.6%. After peak-aging treatment, the strength of the GW63K alloy increased to 370 MPa, which was significantly higher than the as-built state (267 MPa). The superior strength in this study is attributed to the refinement strengthening imparted by the fine microstructure inherited in the as-built GW63K alloy, as well as the precipitation strengthening due to the formation of dense β' precipitates with a pronounced plate-like aspect ratio.
UR  - https://doi.org/10.1016/j.jma.2025.03.026
DO  - 10.1016/j.jma.2025.03.026