Influence of travel speed on microstructure and mechanical properties of wire + arc additively manufactured 2219 aluminum alloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第2期
论文作者：Yinghui Zhou Xin Lin Nan Kang Weidong Huang Jiang Wang Zhennan Wang
文章页码：143 - 153
摘 要：Wire + arc additive manufacturing（WAAM） was preliminarily employed to fabricate the 2219 aluminum alloy. The influence of the electric arc travel speed（TS） on the macro-morphology, microstructure, and mechanical properties were investigated. The results indicated that as the electric arc TS increased, the size and the volume fraction of equiaxed grain decreased. The high arc TS during WAAM also promoted the precipitation of the θ（Al2Cu） phase. The volume fractions of θ’’ and θ’ phases reached maximum values when TS is 350 and 250 mm/min, respectively. The thermal cycle facilitated the precipitation of the θ’ phase. In addition, the micro-hardness and tensile strength of the alloy were analyzed, and the results indicated that samples fabricated at TS of 350 mm/min possessed finer equiaxed grain and exhibited higher ultimate tensile strength（273.5 MPa） and yield strength（182.9 MPa） compared to those fabricated at 250 mm/min.
Yinghui Zhou1,2，Xin Lin1,2，Nan Kang1,2，Weidong Huang1,2，Jiang Wang1,2，Zhennan Wang1,2
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University2. Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MIIT China, Northwestern Polytechnical University
摘 要：Wire + arc additive manufacturing（WAAM） was preliminarily employed to fabricate the 2219 aluminum alloy. The influence of the electric arc travel speed（TS） on the macro-morphology, microstructure, and mechanical properties were investigated. The results indicated that as the electric arc TS increased, the size and the volume fraction of equiaxed grain decreased. The high arc TS during WAAM also promoted the precipitation of the θ（Al2Cu） phase. The volume fractions of θ’’ and θ’ phases reached maximum values when TS is 350 and 250 mm/min, respectively. The thermal cycle facilitated the precipitation of the θ’ phase. In addition, the micro-hardness and tensile strength of the alloy were analyzed, and the results indicated that samples fabricated at TS of 350 mm/min possessed finer equiaxed grain and exhibited higher ultimate tensile strength（273.5 MPa） and yield strength（182.9 MPa） compared to those fabricated at 250 mm/min.
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