  During the solidification of Al-Sm metallic glasses the evolution of the
supercooled liquid atomic structure has been identified with an increasing
population of icosahedral-like clusters with increasing Sm concentration. These
clusters exhibit slower kinetics compared to the remaining clusters in the
liquid leading to enhanced amorphous phase stability and glass forming ability
(GFA). Maximum icosahedral-ordering and atomic packing density have been found
for the Al90Sm10 and Al85Sm15 alloys, respectively, whereas minimum cohesive
energy has been found for the Al93Sm7 which is consistent with the range of
compositions (from Al92Sm8 to Al84Sm16) found experimentally with high GFA.
