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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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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