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

Published online by Cambridge University Press:  12 November 2018

Fuxing Xie Open the ORCID record for Fuxing Xie [Opens in a new window] ,
Jun Shen ,
Huiyu Song  and
Xiong Xie
Fuxing Xie
Affiliation:
State Key Laboratory of Mechanical Transmission, School of Material Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Jun Shen*
Affiliation:
State Key Laboratory of Mechanical Transmission, School of Material Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Huiyu Song
Affiliation:
State Key Laboratory of Mechanical Transmission, School of Material Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Xiong Xie
Affiliation:
State Key Laboratory of Mechanical Transmission, School of Material Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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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.

Keywords

MgweldingCe
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 24 , 28 December 2018 , pp. 4340 - 4348
Copyright
Copyright © Materials Research Society 2018 

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References

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