(江蘇科技大學(xué) 材料科學(xué)與工程學(xué)院，鎮(zhèn)江 212003)
摘 要: 通過選區(qū)激光熔化(SLM)技術(shù)制備了Al-Mg-Mn-Er-Zr鋁合金，系統(tǒng)研究了不同工藝參數(shù)對(duì)合金粉末成形性以及時(shí)效處理對(duì)沉積態(tài)樣品力學(xué)性能的影響。結(jié)果表明：高激光能量密度下獲得的樣品不存在微裂紋，樣品的孔隙率較低，最低約為0.4%。樣品以柱狀晶為主，熔池邊界分布有少量等軸晶，平均晶粒寬度約為5 μm。樣品中主要包含α(Al)、Al6Mn和L12型晶體相。在350 ℃下，樣品的硬度和壓縮屈服強(qiáng)度隨時(shí)效時(shí)間的延長先增加后降低，最大值分別為(171±1) HV和(555±12) MPa。
關(guān)鍵字: 選區(qū)激光熔化；Al-Mg-Mn-Er-Zr合金；時(shí)效處理；顯微組織；力學(xué)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
