机电工程技术2025，Vol.54Issue(4)：34-37,84,5.DOI:10.3969/j.issn.1009-9492.2025.04.005
7075铝合金CMT电弧增材组织及性能研究
Study on Microstructure and Properties of 7075 Aluminum Alloy CMT Arc Additive
摘要
Abstract
Due to its excellent properties of high strength,low density and corrosion resistance,aluminum alloy has been widely used in aerospace,naval ship manufacturing and automobile transportation.Arc additive manufacturing has high deposition rate and material utilization,as well as good design margin,which is very suitable for the manufacture of high-strength aluminum alloy components.However,at present,the high strength aluminum alloys manufactured by additive manufacturing generally have defects such as more pores and non-fusion between layers,which affect the mechanical properties of the components.To solve these problems,Al-Zn-Mg-Cu alloy made by arc additive is taken as the research object.The macroscopic morphology and metallographic structure of the deposited samples are observed by optical microscope,the microscopic structure of the samples is observed by scanning electron microscope,and the tensile properties of the deposited samples are detected by electronic universal tensile machine.The results show that after the addition of TiC nanoparticles,the deposited samples have fewer pores and uniform microstructure,and the obtained structures are all isaxed without particle aggregation.η MgZn2 phase can be precipitated at the grain boundaries.After T6 heat treatment,the ultimate tensile strength of the deposited samples is 469 MPa and 476 MPa,respectively,mechanical property is excellent.The study provides important ideas and references for the development and design of additive manufacturing aluminum alloy materials.关键词
电弧增材/Al-Zn-Mg-Cu合金/TiC纳米颗粒/微观组织/力学性能Key words
arc additive/Al-Zn-Mg-Cu alloy/TiC nanoparticles/microstructure/mechanical property分类
矿业与冶金引用本文复制引用
徐望辉,李雨,刘莉,董春林,刘锐哲..7075铝合金CMT电弧增材组织及性能研究[J].机电工程技术,2025,54(4):34-37,84,5.基金项目
国家自然科学基金资助项目(52205341) （52205341）
广州市开发区国际科技合作项目(2023GH19) （2023GH19）
