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《Rare Metal Materials and Engineering》 2017-08
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Microstructure and Properties of Double-Wires Plus Arc Additive Manufactured Aluminium Alloy Deposits Using VP-GTAW Process

Sun Hongye;Cong Baoqiang;Qi Zewu;Qi Bojin;Zhao Gang;Ding Jialuo;Beihang University;MIIT Key Laboratory of Aeronautics Intelligent Manufacturing;Cranfield University;  
Double-wires plus arc additive manufacturing(D-WAAM) system for Al-Cu-Mg alloy using variable polarity gas tungsten arc welding(VP-GTAW) process was established. Al-6.3Cu and Al-5Mg wires were employed as filling metal. The microstructure and mechanical properties of as-deposited D-WAAM samples were analyzed. Results show that the excellent deposits wall samples can be achieved and the deposition efficiency can be improved by D-WAAM process. Al-Cu-Mg alloys with different element contents of copper and magnesium are obtained by adjusting the feed speed of the two wires. The microstructures of Al-Cu-Mg deposits are mainly composed of columnar dendrite and equiaxed dentrite grains with the non-uniform distribution characteristics. Mechanical properties can be enhanced due to the addition of alloying elements. The microhardness(HV) of as-deposited Al-Cu-Mg alloy is 900~1000 MPa. The UTS, YS and elongation of as-deposited D-WAAM alloy can be increased to 286 MPa, 183 MPa and 4.5%, respectively.
【Fund】: 北京市科技计划装备制造专项(Z161100001516005);; 中央高校基本科研业务费专项资金(YWF-15-GJSYS-096 YWF-16-GJSYS-019)
【CateGory Index】: TG146.21;TG661
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