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Experimental study on brazing AZ31B magnesium alloy by magnalium alloys

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Abstract

The Mg-68.5Al, Mg-37.5Al, and Mg-28.7Al brazing filler metals were used to braze AZ31B magnesium alloy. Microstructures of solders with different stoichiometries of Mg and Al were investigated. The brazing processes were carried out at 490 °C and held for 30 s in a resistance furnace. The microstructure evolution and mechanical properties of the three kinds of brazed joints were assessed. The effects of compositions on the performance of the joints were also summarized. Because of the melt of base metal into the brazing seam, the content of ɑ-Mg phase in the brazing seams was much higher than that in the filler metals. And then different solidification reaction occurred in the brazing seams. As the Mg content in the filler metal increased from 31.5 to 71.3 wt%, the microstructures of the filler metals and brazed joints changed markedly, the content of ɑ-Mg phase in brazing seams increased, and the joint shear strength increased from 17 to 75 MPa, which indicated that higher content of ɑ-Mg phase was beneficial to the joint property.

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing, 100191, People’s Republic of China

    Yongchao Wu, Wenqing Qu, Zheng Wang & Hongshou Zhuang

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  1. Yongchao Wu
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  2. Wenqing Qu
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  3. Zheng Wang
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  4. Hongshou Zhuang
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Correspondence to Wenqing Qu.

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Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding

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Wu, Y., Qu, W., Wang, Z. et al. Experimental study on brazing AZ31B magnesium alloy by magnalium alloys. Weld World 64, 233–241 (2020). https://doi.org/10.1007/s40194-019-00809-x

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