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Effects of AlSi12 interlayer on microstructure and mechanical properties of laser welded 5A06/Ti6Al4V joints

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Abstract

The morphology of the weld seam, the formation mechanism of interface, and the microstructure and mechanical properties of both direct and AlSi12 (ER4047)-added dissimilar 5A06Al/Ti6Al4V lap joints were investigated, respectively. The Gibbs free energies of intermetallic compounds, such as TiAl3, TiAl, and Ti3Al, were calculated. The results showed that the interface layers were mainly composed of Ti3Al, TiAl, and TiAl3, and the order of them was TiAl3, TiAl, and Ti3Al from outside to inside. The addition of ER4047 interlayer could suppress the formation of IMCs and reduce the micro-cracks in TiAl3 layer. The ER4047-added joints featured good mechanical properties, i.e., the shear strength of 2087 N, 2405 N, and 2157 N respectively, which were much higher than the shear strength of 1721 N for the direct joint. Furthermore, the fracture model of the direct joint was brittle fracture, while that of the ER4047-added joints was quasi-cleavage. The results can provide theoretical guidance for the prediction of Ti/Al interface reaction and welding of other dissimilar metals.

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Funding

This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFB1104801).

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Authors and Affiliations

  1. State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China

    Xiongfeng Zhou, Xiaobing Cao & Ji’an Duan

  2. School of Automation, Central South University, Changsha, 410083, China

    Fan Zhang

  3. College of Vehicle Engineering, Hunan Biological and Electromechanical Polytechnic, Changsha, 410127, China

    Zhi Chen

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  1. Xiongfeng Zhou
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  2. Xiaobing Cao
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  3. Fan Zhang
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  4. Zhi Chen
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  5. Ji’an Duan
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Contributions

Fan Zhang and Ji’an Duan proposed this work and gave guidance to the writing and revision of the manuscript; Xiongfeng Zhou and Xiaobing Cao performed the experiments; Xiongfeng Zhou and Zhi Chen analyzed the experiment data; Xiongfeng Zhou wrote the manuscript.

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Correspondence to Fan Zhang or Ji’an Duan.

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Recommended for publication by Commission X - Structural Performances of Welded Joints - Fracture Avoidance

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Zhou, X., Cao, X., Zhang, F. et al. Effects of AlSi12 interlayer on microstructure and mechanical properties of laser welded 5A06/Ti6Al4V joints. Weld World 65, 1389–1402 (2021). https://doi.org/10.1007/s40194-021-01129-9

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  • DOI: https://doi.org/10.1007/s40194-021-01129-9

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