Effect of Heat Treatment on the Microstructure and Corrosion Properties of Plasma Wire Arc Additive Manufactured Mg-Gd-Y-Zr Alloy

In this study, plasma wire arc additive manufacturing (P-WAAM), a technique known for its high deposition efficiency and material utilization rates, was applied to manufacture Mg-Gd-Y-Zr alloy. An investigation was conducted to examine the impact of heat treatment on the microstructure and corrosion characteristics of P-WAAM Mg-Gd-Y-Zr alloy. The results indicated that heat treatment effectively eliminated twins and residual stresses in P-WAAM Mg-Gd-Y-Zr alloy, while also homogenizing the second phase β-Mg24(Gd, Y)5. The treatment resulted in an increase in the self-corrosion potential (Ecorr) from -1.413 V to -1.311 V and a reduction in the corrosion current density (Icorr) from 2.046×10−5 A/cm2 to 4.766×10−6 A/cm2. Consequently, implementing an appropriate heat treatment regimen significantly improves the microstructure and corrosion resistance of the P-WAAM Mg-Gd-Y-Zr alloy.

Keywords: Mg-Gd-Y-Zr Alloy, P-WAAM, Heat Treatment, Microstructure, Corrosion

Suggested Citation: Suggested Citation

Li, Jiamin and Huang, Meng and Hou, Juan and Yang, Yi and Xu, Gaopeng and Mo, Ning and Tang, Weineng and Shi, Yun, Effect of Heat Treatment on the Microstructure and Corrosion Properties of Plasma Wire Arc Additive Manufactured Mg-Gd-Y-Zr Alloy. Available at SSRN: https://ssrn.com/abstract=4900375 or http://dx.doi.org/10.2139/ssrn.4900375