A team led by Associate Researcher Li Zhuo at Beihang University has successfully fabricated a magnesium alloy containing approximately 23% gadolinium using laser-directed energy deposition (LDED) technology. Published recently, this study breaks the alloying limit of high-rare-earth magnesium alloys. The as-deposited alloy exhibits an average grain size of only 11.9 μm. After aging at 220 °C for 12 hours, it achieves a hardness of 144 HV, a tensile strength of 425 MPa, and an elongation of 3.4%. The number density of β′ phases reaches 2.4 × 10⁴ μm⁻², 2 to 6 times higher than similar alloys. Traditional fabrication of high-gadolinium magnesium alloys faces challenges such as coarse grains and composition segregation. The rapid solidification characteristic of additive manufacturing effectively addresses these issues, offering a new process route for high-performance lightweight materials. This result proves that ultra-high-rare-earth magnesium alloys can achieve excellent strength and ductility via additive manufacturing. Their high-temperature performance degrades slowly, showing potential for long-term service in fields like aerospace.