为提高选区激光熔化成形AlSi10Mg零件力学性能, 文中通过球磨法获得Sc-AlSi10Mg复合粉末, 并研究成形试样的相成分、微观组织、显微硬度、拉伸性能和耐蚀性能。对相同工艺参数下成形的试样进行对比, 0.5%(质量分数)Sc-AlSi10Mg试样显微硬度最高, 由146.89 HV提高到174.88 HV, 增长19.06%。0.1%(质量分数)Sc-AlSi10Mg试样拉伸性能最好, 极限拉伸强度由370.20 MPa提高到420.98 MPa, 提升13.72%; 延伸率由8.96%提高到10.27%, 提升14.62%。Sc-AlSi10Mg试样的耐蚀性能也有所增强。结果表明：添加稀土元素钪能细化选区激光熔化成形AlSi10Mg试样晶粒, 通过细晶强化作用提升性能, 这对其应用在航空航天、汽车等领域具有重要意义。

In order to improve the mechanical properties of AlSi10Mg parts formed by Selective Laser Melting (SLM), Sc-AlSi10Mg composite powder was prepared by ball milling, and the phase composition, microstructure, microhardness, tensile property and corrosion resistance of SLM-processed samples were studied. Compared with the samples formed under the same technological parameters, the microhardness of 0.5%(mass fraction) Sc-AlSi10Mg sample was the highest, which increased from 146.89 HV to 174.88 HV, an increase of 19.06%.The 0.1%(mass fraction)Sc-AlSi10Mg sample had the best tensile property, and the ultimate tensile strength increased from 370.20 MPa to 420.98 MPa, an increase of 13.72%.The elongation increased from 8.96% to 10.27%, an increase of 14.62%. The corrosion resistance of Sc-AlSi10Mg composite samples was also enhanced. The results show that the addition of Scandium can refine the grains of AlSi10Mg samples by Selective Laser Melting, and the mechanical properties were enhanced through the strengthening of fine grain, which is of great significance for its application in aerospace, automobile and other fields.