Abstract
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.
Highlights
Mg alloys are among the lightest metallic structural materials, and possess salient advantages including high specific strength and stiffness, good thermal conductivity, and good damping performance, etc
The tensile specimens from the friction stir processing (FSP) Mg–6Sn–2Zn alloy were cut along the the FSP Mg–6Sn–2Zn alloy were along thestir processing with the in1.the stir zone processing direction (PD)
Sn phase dissolved during FSP was reduced with the increase of travel speed, which is in accordance with the
Summary
Mg alloys are among the lightest metallic structural materials, and possess salient advantages including high specific strength and stiffness, good thermal conductivity, and good damping performance, etc. Grain refinement is generally believed effective in improving the comprehensive mechanical behavior of metallic materials. The mechanical behavior of metallic materials is usually improved obviously after the SPD process [7]. FSP has been used to modify the microstructure and improve the mechanical and densification [10,11]. FSP has to modify the microstructure improve mechanical remarkable refinement, andexample, breaking Wang up andetdissolution of the β-Mg. 12 phase behavior of grain several cast Mg homogenization, alloys [12,13]. Xiao et al. FSP,breaking the grains a Mg–Gd–Y–Zr alloy refined, remarkable homogenization, upofand dissolution of thewere β-Mg. AZ31 alloyphase [14]. Mg–6Sn–2Zn mechanism of microstructure to FSP with different travel speeds. The influence factors of mechanical properties of FSP Mg–6Sn–2Zn samples were discussed
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