选区激光熔化Al-Zn-Mg-Sc合金组织与性能研究  

The microstructure and mechanical properties of selective laser melted Al-Zn-Mg-Sc alloy

作　　者：谢芳浩 李加南 邓声华[2] 李卫荣 XIE Fanghao;LI Jianan;DENG Shenghua;LI Weirong(Jiangxi Tungsten Holding Group Company Limited,Nanchang 330000,China;Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Dongguan Eontec Co.,Ltd.,Dongguan 523000,Guangdong,China)

机构地区：[1]江西钨业控股集团有限公司,南昌330000 [2]江西理工大学材料冶金化学学部,江西赣州341000 [3]东莞宜安科技股份有限公司,广东东莞523000

出　　处：《有色金属科学与工程》2022年第4期61-69,147,共10页Nonferrous Metals Science and Engineering

基　　金：江西省自然科学基金青年项目(20202BABL214026);江西省教育厅青年基金项目(GJJ190476);江西理工大学博士科研启动基金(jxxjbs19010)。

摘　　要：采用选区激光熔化(SLM)技术成形Al-Zn-Mg-Sc合金。研究了激光打印参数及热处理工艺对Al-Zn-Mg-Sc合金显微组织与力学性能的影响。研究结果表明,打印态Al-Zn-Mg-Sc合金组织具有显著的各向异性特征:建造面熔池为鱼鳞状,晶粒为大尺寸柱状晶;扫描面熔池则为条带状,晶粒为小尺寸柱状晶与等轴晶。SLM成形的Al-Zn-Mg-Sc合金存在大量热裂纹,严重影响合金力学性能。但热处理后,Al-Zn-Mg-Sc合金力学性能显著提高。经过热处理后合金的维氏(HV)硬度由91.70提升至144.27,抗拉强度由183.71 MPa提升至257.53 MPa。The selective laser melting(SLM)was applied to prepare an Al-Zn-Mg-Sc alloy.The microstructure and mechanical properties of the selective laser melted Al-Zn-Mg-Sc alloy was investigated before and after heat treatment.The results showed that the printed Al-Zn-Mg-Sc alloy had an anisotropic microstructure:a fish-scale-like molten pool,large columnar grains at the building plane,and small strips of grains with equiaxed grains at the scanning plane.A large number of hot cracks were found in the alloy,resulting in poor mechanical properties.However,after heat treatment,the performance of the alloy was significantly improved.After heat treatment,the Vickers hardness of the alloy increased from 91.70 to 144.27,and the tensile strength increased from 183.71 MPa to 257.53 MPa.

关 键 词：选区激光熔化 Al-Zn-Mg-Sc合金 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]