Mg-Gd-Y-Zn-Zr Alloys Fabricated by CMT Arc Additive Manufacturing：Processing, microstructure refinement and property analysis
Description
A CMT welding simulation was carried out in ANSYS Fluent. The simulation was completed through UDF programming combined with GUI-based operations. A case file has been uploaded to the database; users can download it and reproduce the results presented in the paper using the material parameters provided in the database.In this study, the mechanism of strength–ductility synergy in CMT arc additively manufactured Mg–Gd–Y–Zn–Zr alloys was clarified. At a wire feeding speed of 14 m/min, high heat input enhanced molten-pool flow and stirring, enabling bubble escape and nearly eliminating porosity. Meanwhile, increased heat input dispersed agglomerated Zr particles into the pool, providing abundant heterogeneous nucleation sites and causing abnormal grain refinement (~6.32 μm) despite a lower cooling rate. As a result, the alloy achieved 328 MPa UTS and 7.27% elongation, attributed to reduced pores, grain-refinement strengthening, basal slip activation, and continuous twinning.