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Effects of Welding Speed and Post-weld Hot Rolling on Microstructure and Mechanical Properties of Friction Stir-Welded AZ31 Magnesium Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The as-rolled AZ31 Mg alloy sheets are welded by friction stir welding (FSW) in this study, followed by annealing and hot rolling with different reductions. The effects of welding speed and the rolling reduction on the microstructure, tensile properties, microhardness and fracture surfaces of the specimens are investigated. The results show that the microstructures of the FSW joint in different regions become more and more consistent as the hot rolling reduction increases. The mechanical properties of the FSW joints and the joint coefficient are improved with increasing rolling reduction; however, the hardness value in the stirred zone decreases firstly and then increases. When the rolling reduction is 50%, the tensile strength of FSW joint is close to that of base metal. The sample L3 achieves the best comprehensive properties, with the yield strength, ultimate tensile strength and elongation of 162, 287.9 MPa, and 17.9%, respectively.

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Acknowledgements

The authors would like to acknowledge financial support by the National Key Research and Development Program of China (Project Nos. 2016YFB0301100 and 2016YFB0700403), the National Natural Science Foundation (Project No. 51601024), the National Key Research, the Chongqing Research Program of Basic Research and Frontier Technology (Project No. cstc2016jcyjA0418), the National Natural Science Foundation of China (Grant No. 51701026) and the Fundamental Research Funds for the Central Universities (Project No. 106112017CDJXY130001).

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Correspondence to Xiao-Dong Peng.

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Liu, G., Ma, LN., Ma, ZD. et al. Effects of Welding Speed and Post-weld Hot Rolling on Microstructure and Mechanical Properties of Friction Stir-Welded AZ31 Magnesium Alloy. Acta Metall. Sin. (Engl. Lett.) 31, 853–864 (2018). https://doi.org/10.1007/s40195-018-0725-5

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  • DOI: https://doi.org/10.1007/s40195-018-0725-5

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