41Nd5/Mg24Y5），沉積態(tài)合金的抗拉強(qiáng)度可達(dá)到190 MPa。經(jīng)T5處理后，峰值時(shí)效硬度由沉積態(tài)的74 HV0.2提升至91 HV0.2，基體中存在大量殘留共晶組織。T6熱處理可獲得更高的峰值時(shí)效硬度（108 HV0.2），共晶組織充分回溶，基體中殘留少量的Mg24Y5相。T6處理使得合金抗拉強(qiáng)度提升至283 MPa，但也容易引發(fā)明顯的晶粒異常長(zhǎng)大現(xiàn)象，且沿豎直方向的延伸率顯著低于水平方向。;A WE43 (Mg-4Y-3Nd-0.5Zr, wt%) magnesium-rare earth alloy thin-wall component was fabricated by wire arc additive manufacturing, and its microstructure and mechanical properties were investigated by multiscale characterization, microhardness, and tensile tests. The influences of direct aging (T5) and solid solution+aging (T6) on the microstructure evolution and mechanical properties were studied. Results indicate that the as-deposited WE43 alloy has a uniform equiaxed crystal matrix, with an average grain size of 25.3 μm. Reticulated eutectic structure (α-Mg+Mg41Nd5/Mg24Y5) is formed due to Nd and Y element liquid segregation at grain boundaries. Tensile strength of as-deposited alloys is 190 MPa. Peak hardness increases from 74 HV0.2 to 91 HV0.2 after T5 aging with persistence of significant eutectic structures. Peak aging hardness is 108 HV0.2 after T6 treatment, and the eutectic structure is dissolved completely, while a small amount of Mg24Y5 remains in matrix. Tensile strength of alloys is enhanced to 283 MPa after T6 treatment, but it also induces significant grain growth and reduces the elongation in vertical direction more obviously than in horizontal direction."/>