Mechanical and corrosion performance of Mg alloy via 3DP by full liquid phase sintering

Three dimensional printing (3DP) additive manufacturing(AM) of magnesium(Mg) alloys is difficult to densify by conventional sintering process which limits its application. In this study, a novel 3DP sintering process with full liquid was utilized to improve performance of Mg alloy. Mg alloy powders were shaped at roomtemperature withwater-based binder, and formed the MgO net-like framework at 90 degrees C in air atmosphere, then sintered over the liquidus temperature under the Ar atmosphere. The results show that a large amount of liquid alloy can effectively improve the density of the sample by filling the pores and mass transferring, the MgO net-like framework can effectively maintain the original shape of the parts. Density, microstructural, mechanical and corrosion properties of the parts were investigated after sintered at 620 degrees C for 5, 8, 10 and 12 h. The results indicated an improvement of propertieswith increasing in sintering time. Swelling phenomenonwas not observed in this sintering temperature. The net-like framework structure might prevent the swelling caused by liquid phase flowtoo. The parts after sintering for 12 h at 620 degrees C showthe remarkable relative density (97.8%), ultimate compressive strength (similar to 354 MPa), and mass loss rate in 25 degrees C is 139 mm / year. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

A novel 3D printing sintering process with full liquid was used to improve the performance of magnesium alloys. By filling the pores and mass transferring, a large amount of liquid alloy effectively improved the density of the samples, while the MgO net-like framework maintained the original shape of the parts. The properties of the parts improved with increasing sintering time.