High-strength and thermally stable TiB_(2)-modified Al-Mn-Mg-Er-Zr alloy fabricated via selective laser melting  

作　　者：Jiang Yu Yaoxiang Geng Yongkang Chen Xiao Wang Zhijie Zhang Hao Tang Junhua Xu Hongbo Ju Dongpeng Wang 

机构地区：[1]School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China [2]Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China [3]National Engineering Research Center of Near-Net Shape Forming for Metallic Materials,Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials,South China University of Technology,Guangzhou 510640,China [4]CEMMPRE-Centre for Mechanical Engineering Materials and Processes,Department of Mechanical Engineering,University of Coimbra,Rua Luís Reis Santos,Coimbra 3030-788,Portugal

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第10期2221-2232,共12页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51801079 and 52001140);the Portugal National Funds through Fundação para a Ciência e a Tecnologia Project(No.2021.04115).

摘　　要：To increase the processability and plasticity of the selective laser melting(SLM)fabricated Al-Mn-Mg-Er-Zr alloys,a novel TiB_(2)-modified Al-Mn-Mg-Er-Zr alloy with a mixture of Al-Mn-Mg-Er-Zr and nano-TiB_(2) powders was fabricated by SLM.The pro-cessability,microstructure,and mechanical properties of the alloy were systematically investigated by density measurement,microstruc-ture characterization,and mechanical properties testing.The alloys fabricated at 250 W displayed higher relative densities due to a uni-formly smooth top surface and appropriate laser energy input.The maximum relative density value of the alloy reached(99.7±0.1)%,demonstrating good processability.The alloy exhibited a duplex grain microstructure consisting of columnar regions primarily and equiaxed regions with TiB_(2),Al6Mn,and Al3Er phases distributed along the grain boundaries.After directly aging treatment at a high tem-perature of 400℃,the strength of the SLM-fabricated TiB_(2)/Al-Mn-Mg-Er-Zr alloy increased due to the precipitation of the secondary Al6Mn phases.The maximum yield strength and ultimate tensile strength of the aging alloy were measured to be(374±1)and(512±13)MPa,respectively.The SLM-fabricated TiB_(2)/Al-Mn-Mg-Er-Zr alloy demonstrates exceptional strength and thermal stability due to the synergistic effects of the inhibition of grain growth,the incorporation of TiB_(2) nanoparticles,and the precipitation of secondary Al6Mn nanoparticles.

关 键 词：selective laser melting aluminum alloy PROCESSABILITY mechanical properties thermal stability 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG665[金属学及工艺—金属材料]