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Microstructure and Tensile Properties of Friction Stir Processed Mg–Sn–Zn Alloy

Key Lab of Advanced Material Design and Additive Manufacturing of Jiangsu Province, Jiangsu University of Technology, Changzhou 213001, China
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Materials 2018, 11(4), 645; https://doi.org/10.3390/ma11040645
Received: 21 March 2018 / Revised: 18 April 2018 / Accepted: 19 April 2018 / Published: 23 April 2018
(This article belongs to the Section Manufacturing Processes and Systems)
In this study, as-cast Mg–6Sn–2Zn (wt.%) alloy was subjected to friction stir processing (FSP) and the microstructure and tensile properties of FSP Mg–6Sn–2Zn samples were investigated. It was found that, in the stir zone (SZ) of FSP Mg–6Sn–2Zn samples, α-Mg grains were significantly refined via dynamic recrystallization (DRX) and the Mg2Sn phase was broken and partially dissolved. The microstructure in SZ was nonuniform and DRXed grains in the SZ-up regions were coarser than those in the SZ-down regions. Coarse broken Mg2Sn particles were observed in the SZ-up regions, while only fine Mg2Sn particles were observed in the SZ-down regions. Strong {0001} basal texture developed in the SZ regions of Mg–6Sn–2Zn samples after FSP. The increase of travel speed had little effect on the texture of different SZ regions. The ductility of FSP Mg–6Sn–2Zn samples was obviously improved, while the improvement in strength was negligible when compared to the as-cast sample. The tensile properties of FSP Mg–6Sn–2Zn samples were influenced by grain refinement, texture modification, and the breaking up and dissolution of the Mg2Sn phase. View Full-Text
Keywords: Mg–Sn–Zn alloy; friction stir processing; microstructure; texture; tensile properties Mg–Sn–Zn alloy; friction stir processing; microstructure; texture; tensile properties
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Chen, X.; Dai, Q.; Li, X.; Lu, Y.; Zhang, Y. Microstructure and Tensile Properties of Friction Stir Processed Mg–Sn–Zn Alloy. Materials 2018, 11, 645.

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