CMT wire arc additive manufactured ultra-high strength WE43 alloy via in-situ cooling and precipitation regulating

Abstract

This study used an active cooling technique (ACT) to increase the rare solid solubility of earth elements and reduce the volume fraction of the eutectic phase. After that, a short-time solid solution was used to avoid grain coarsen, while the eutectic phase could be completely dissolved into the matrix. To regulate the precipitation precisely, using a two-stage aging enables the precipitation of a massive and homogeneous β′ phase in the matrix. The Mg-RE alloy exhibited an ultimate tensile strength (UTS) of 393 ± 5 MPa, a yield strength (YS) of 265 ± 5 MPa, and an elongation (EL) of 5 ± 0.5%.