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Effect of Lanthanum Addition on Grain Refinement and Mechanical Properties of Mg–9Li–3Al Alloy

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Abstract

The impact of lanthanum addition on the microstructural changes and mechanical characteristics of Mg–9Li–3Al + xLa alloys are studied. The alloys are fabricated through a liquid metallurgy route involving stir casting by an electrical resistance furnace. The microstructural analysis showed that the as-cast alloys primarily comprises of α-Mg and β-Li phases. Irregular distribution of Al–Li lamellar and some granular fragments MgLi2Al observed over the magnesium-rich α-phase and lithium-rich β-phase. The influence of lanthanum addition to the alloy system leads to grain refinement by forming Al11La3 and Al4La intermetallics. Among the series of cast alloys, the Mg–9Li–3Al–1La alloy exhibits excellent ultimate tensile strength—178 MPa with 10.2% elongation. Addition of 1.5 wt% La and beyond tends to coarsen the grains leading to a reduction in mechanical strength. Hot extruded Mg–9Li–3Al–1La alloy exhibited more refinement in the microstructure and breakdown of intermetallic (Al4La and Al11La3) is observed. A significant improvement in the UTS values around 39% displayed by the Mg–9Li–3Al–1La alloy extruded at a ratio of 25:1.

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  1. Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, 620015, India

    P. Dinesh, S. P. KumareshBabu & S. Natarajan

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  1. P. Dinesh
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  3. S. Natarajan
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Dinesh, P., KumareshBabu, S.P. & Natarajan, S. Effect of Lanthanum Addition on Grain Refinement and Mechanical Properties of Mg–9Li–3Al Alloy. Met. Mater. Int. 27, 3993–4001 (2021). https://doi.org/10.1007/s12540-020-00776-9

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