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Effects of cerium and SiC mixed particles on nanoparticle strengthening activated TIG-welded AZ31 alloy joints

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Abstract

AZ31 magnesium alloy sheets were A-TIG-welded through a coating of flux, which contained different ratios of Ce powder and nano-sized SiC as reinforcement particles and equal mass of TiO2 as activating fluxes. The microscopic analysis results illustrated that relatively low content of Ce in the reinforcement particles caused the formation of Al3Ce precipitates and refined the grains of α-Mg phase together with β-Mg17Al12 and SiC particles. The increase in microhardness and ultimate tensile strength of the joints was 6.2% and 19.2%, respectively, when reinforcement particles contain 20 wt% Ce compared to the joints coated without Ce. By studying the electrochemical test results, when using 20 wt% Ce + 80 wt% SiC as reinforcement particles, the corrosion current density was the lowest and the corrosion resistance reached the largest value, reflecting the improvement of corrosion property of the joint affected by Ce element.

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ACKNOWLEDGMENTS

This research is supported by a Science and Technology Project of Beibei district of Chongqing of China (Project No. 2016-27), a foundation of the State Key Laboratory of Mechanical Transmission of Chongqing University of China (Project No. SKLMT-ZZKT-2017M15), and an Industry Joint Technology Innovation Project of Suzhou of China in 2017.

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Authors and Affiliations

  1. State Key Laboratory of Mechanical Transmission, School of Material Science and Engineering, Chongqing University, Chongqing, 400044, People’s Republic of China

    Fuxing Xie, Jun Shen, Huiyu Song & Xiong Xie

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  1. Fuxing Xie
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  2. Jun Shen
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  4. Xiong Xie
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Correspondence to Jun Shen.

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Xie, F., Shen, J., Song, H. et al. Effects of cerium and SiC mixed particles on nanoparticle strengthening activated TIG-welded AZ31 alloy joints. Journal of Materials Research 33, 4340–4348 (2018). https://doi.org/10.1557/jmr.2018.404

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