(江苏科技大学 材料科学与工程学院，镇江 212003)
摘 要: 通过选区激光熔化(SLM)技术制备了Al-Mg-Mn-Er-Zr铝合金，系统研究了不同工艺参数对合金粉末成形性以及时效处理对沉积态样品力学性能的影响。结果表明：高激光能量密度下获得的样品不存在微裂纹，样品的孔隙率较低，最低约为0.4%。样品以柱状晶为主，熔池边界分布有少量等轴晶，平均晶粒宽度约为5 μm。样品中主要包含α(Al)、Al6Mn和L12型晶体相。在350 ℃下，样品的硬度和压缩屈服强度随时效时间的延长先增加后降低，最大值分别为(171±1) HV和(555±12) MPa。
关键字: 选区激光熔化；Al-Mg-Mn-Er-Zr合金；时效处理；显微组织；力学性能
（School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003）
Abstract:The effects of process parameters on processability and the effects of aging treatment on mechanical properties of selective laser melting (SLM) fabricated Al-Mg-Mn-Er-Zr aluminum alloy were systematically studied. The results show that crack-free samples are obtained at the high laser energy density. The minimum porosity of the sample is about 0.4%. The sample mainly includes columnar crystal with small amount of equiaxed crystal distributed at the boundary of molten pool, the average grain size is about 5 μm. The α(Al), Al6Mn and L12 crystal phases are identified in the SLM-fabricated sample. At 350 ℃, the Vickers hardness and compression yield strength of the samples first increase and then decrease with the increase of aging time, and the maximum values are (170.6±1) HV and (463±3) MPa, respectively.
Key words: selective laser melting; Al-Mg-Mn-Er-Zr alloy; aging treatment; microstructure; mechanical property
