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

다국어 초록 (Multilingual Abstract)

The impact of lanthanum addition on the microstructural changes and mechanical characteristics of Mg–9Li–3Al + xLaalloys are studied. The alloys are fabricated through a liquid metallurgy route involving stir casting by an electrical resistancefurnace. 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 MgLi2Alobserved over the magnesium-rich α-phaseand lithium-rich β-phase. The influence of lanthanum addition to the alloy system leads to grain refinement by formingAl11La3and Al4Laintermetallics. Among the series of cast alloys, the Mg–9Li–3Al–1La alloy exhibits excellent ultimatetensile strength—178 MPa with 10.2% elongation. Addition of 1.5 wt% La and beyond tends to coarsen the grains leadingto a reduction in mechanical strength. Hot extruded Mg–9Li–3Al–1La alloy exhibited more refinement in the microstructureand 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.

참고문헌 (Reference)

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