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Microstructure, mechanical properties and corrosion resistance of as-cast and as-extruded Mg–4Zn–1La magnesium alloy

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Abstract

Microstructure, mechanical properties and corrosion resistance of as-cast and as-extruded Mg–4 wt% Zn–1 wt% La magnesium alloys were investigated. The alloys were produced by low-pressure die casting method and extruded at 350 °C after homogenization at 400 °C for 24 h. The results show that the as-cast alloy mainly consists of primary α-Mg matrix and Mg–Zn–La ternary second phases (also called T-Phase) along grain boundaries and isolated spherical particles inside the grains. After extrusion at 350 °C, the average grain size decreases by 81% due to dynamic recrystallization mechanism and T-phase particles are distributed along the extrusion direction. The elongation, yield strength and tensile strength of the as-cast Mg–4Zn–1La alloy increase by 179%, 90% and 40%, respectively, as a result of the extrusion process. The as-extruded Mg–4Zn–1La alloy shows better corrosion resistance than the as-cast alloy due to increased grain boundaries and decreased content of T-phase.

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Acknowledgements

This study is financially supported by the Scientific Research Projects of Karabuk University (BAP) (No. KBU-BAP-16/1-DR-075).

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, Karabuk University, 78050, Karabuk, Turkey

    Huseyin Zengin, Yunus Turen, Hayrettin Ahlatci & Yavuz Sun

  2. Iron and Steel Institute, Karabuk University, 78050, Karabuk, Turkey

    Yavuz Sun

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  1. Huseyin Zengin
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  2. Yunus Turen
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  4. Yavuz Sun
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Correspondence to Yunus Turen.

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Zengin, H., Turen, Y., Ahlatci, H. et al. Microstructure, mechanical properties and corrosion resistance of as-cast and as-extruded Mg–4Zn–1La magnesium alloy. Rare Met. 39, 909–917 (2020). https://doi.org/10.1007/s12598-018-1045-7

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  • DOI: https://doi.org/10.1007/s12598-018-1045-7

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