Abstract
The microstructure of as-cast and extruded Mg14Li1Al(0, 0.3) La alloys was examined with XRD, OM, SEM, and EDS. The mechanical properties of the extruded specimens with and without La were compared. The results show that La addition has an obvious effect on the microstructure of the as-cast LA141 alloy by reducing the average grain size from 600 to 220 μm. β-Li and LiMgAl2 phases are observed in both alloys, and long-rod-shaped Al2La phase is also observed in the La containing alloy. After extrusion, Al2La phases are short-rod-shaped and distribute evenly in the alloy. LA1410.3La alloy has higher elongation (34%), which is attributed to refined microstructure and weak texture due to short-rod-like Al2La phase.
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