Er改性铝合金的选区激光熔化成形性及力学性能  

Processability and mechanical properties of Er-modified aluminum alloy fabricated by selective laser melting

作　　者：贾朝港 耿遥祥[1] 吕洪伟 许俊华[1] 鞠洪博[1] 喻利花[1] JIA Chao-gang;GENG Yao-xiang;LÜHong-wei;XU Jun-hua;JU Hong-bo;YU Li-hua(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003)

机构地区：[1]江苏科技大学材料科学与工程学院,镇江212003

出　　处：《中国有色金属学报》2022年第12期3578-3588,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51801079,52001140)。

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5μm。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。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 5μm.Theα(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.

关 键 词：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 

分 类 号：TG146.2[一般工业技术—材料科学与工程]