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Effects of Sn and Mn Addition on the Microstructure and Mechanical Properties of As-Extruded Mg–2Al–1Zn Alloys

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Abstract

The effects of low Sn (1.0 wt%) and Mn (0.5 wt%) content on the microstructures and mechanical properties of as-extruded Mg–2Al–1Zn (AZ21) alloys were systematically investigated. The combined addition of Sn and Mn significantly refined the grains of the AZ21 alloy, reducing the average grain size from 25.77 to 2.17 μm. The volume fraction of the dynamically recrystallized (DRXed) grains decreased from 78.49 to 43.81% with Sn (1.0 wt%) and Mn (0.5 wt%) addition. The Al8Mn5, Al11Mn4, and Al9Mn4 phases were formed in Mg–2Al–1Zn–1Sn–0.5Mn (AZTM2110) alloy, and the Mg17Al12 phase disappeared. The orientation relationship between Al9Mn4 and Al11Mn4 was (002)Al11Mn4//(\(\bar{3}\)02)Al9Mn4, [\(\bar{1}\)00]Al11Mn4//[223]Al9Mn4, and the orientation relationship between Al8Mn5 and α-Mg was (\(\bar{2}\)52)Al8Mn5//(\(\bar{1}\)2\(\bar{1}\)3)α−Mg. The Al9Mn4 and Al11Mn4 phases grew in the same direction. The intensity of basal fiber texture of AZTM2110 alloy decreased by 21.7%. The ultimate tensile strength, yield strength, and elongation of the AZ21 alloy increased by 29.03%, 65.05%, and 61.02%, respectively. Grain-refinement strengthening was the main mechanism underlying the improvement in AZTM2110 alloy strength. Grain refinement and the weakened basal fiber texture improved the plasticity of the AZTM2110 alloy.

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Acknowledgements

Financial assistance from the Key Technology Research and Development Program of Shandong (Project No. 2019GGX102060) is highly acknowledged.

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao, 266525, China

    Fu-Hao Gao, Bin-Jiang Lv, Tie-Wei Xu, Ning Cui & Feng Guo

  2. Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Qingdao University of Technology, Qingdao, 266520, China

    Bin-Jiang Lv & Feng Guo

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  1. Fu-Hao Gao
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Correspondence to Bin-Jiang Lv.

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Gao, FH., Lv, BJ., Xu, TW. et al. Effects of Sn and Mn Addition on the Microstructure and Mechanical Properties of As-Extruded Mg–2Al–1Zn Alloys. Met. Mater. Int. 29, 3178–3189 (2023). https://doi.org/10.1007/s12540-023-01435-5

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