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Effect of Hot Extrusion on the Microstructure, Mechanical Properties, and Corrosion Behavior of Mg–11Li–3Al–2Zn–1.5Nd–0.2Zr Alloy

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Abstract

The microstructure, mechanical properties, and corrosion behavior of Mg–11Li–3Al–2Zn–1.5Nd–0.2Zr alloy before and after hot extrusion were studied. The results show that both as-homogenized and as-extruded alloys consist of β-Li, AlLi, MgLi2Al, and NdAl3 phases. The ultimate tensile strength and elongation of as-extruded alloy are 149.86 MPa and 42.33%, respectively, which are higher than those of as-homogenized alloy (132.99 MPa and 19%). The as-extruded alloy shows a better corrosion resistance with a lower hydrogen evolution rate and a higher charge transfer resistance. The improvement of mechanical properties and corrosion resistance of Mg–11Li–3Al–2Zn–1.5Nd–0.2Zr alloy after hot extrusion are as a result of the grain refinement and the uniform distribution of crumbled intermetallic phases.

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Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities of Central South University (No. 2017zzts005) and the Open-End Fund for the Valuable and Precision Instruments of Central South University (No. CSUZC201814).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Xue Lei, Richu Wang, Chaoqun Peng, Yan Feng & Yuehua Sun

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  1. Xue Lei
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  3. Chaoqun Peng
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Lei, X., Wang, R., Peng, C. et al. Effect of Hot Extrusion on the Microstructure, Mechanical Properties, and Corrosion Behavior of Mg–11Li–3Al–2Zn–1.5Nd–0.2Zr Alloy. Trans Indian Inst Met 72, 2893–2899 (2019). https://doi.org/10.1007/s12666-019-01765-2

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