Microstructure and Mechanical Properties of Wire + Arc Additively Manufactured 2050 Al–Li Alloy Wall Deposits

查看全文 作　　者：Hao [1,2]Zhong;Bojin [1,2]Qi;Baoqiang [1,2]Cong;Zewu [1,2]Qi;Hongye [1,2]Sun

机构地区：[1]School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China;[2]MIIT Key Laboratory of Aeronautics Intelligent Manufacturing,Beijing 100191,China

出　　处：《Chinese Journal of Mechanical Engineering》索引2019年第32卷第6期,共7页

基　　金：Supported by National Natural Science Foundation of China(Grant No.51675031);Beijing Municipal Science and Technology Commission and Fundamental Research Funds for the Central Universities(Grant No.YWF-18-BJ-J-244,YWF-19-BJ-J-232);Beijing Natural Science Foundation(Grant No.3182020);the Academic Excellence Foundation of BUAA for PhD 摘　　要：Aluminum–Lithium(Al–Li) alloy is a topic of great interest owing to its high strength and light weight, but there are only a few applications of Al–Li alloy in wire ss, a special AA2050 Al–Li alloy + arc additive manufacturing(WAAM) process. To identify its feasibility in WAAM procewire was produced and employed in the production of straight-walled components, using a WAAM system based on variable polarity gas tungsten arc welding(VP-GTAW) process. The influence of post-deposited heat treatment on the microstructure and property of the deposit was investigated using optical micrographs(OM), scanning electron microscopy(SEM), X-ray diffraction(XRD), hardness and tensile properties tests. Results revealed that the microstructures of AA2050 aluminum deposits varied with their location layers. The upper layers consisted of fine equiaxed grains, while the bottom layer exhibited a coarse columnar structure. Mechanical properties witnessed a significant improvement after post-deposited heat treatment, with the average micro-hardness reaching 141 HV and the ultimate tensile strength exceeding 400 MPa. Fracture morphology exhibited a typical ductile fracture. 关键词：Aluminum-copper-lithium alloy Wire arc additive manufacturing Heat treatment Mechanical properties

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Microstructure and Mechanical Properties of Wire + Arc Additively Manufactured 2050 Al–Li Alloy Wall Deposits

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引证文献(13)

耦合文献(207)

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