A single-phase nanocrystalline Al 20 Li 20 Mg 10 Sc 20 Ti 30 alloy was developed with a density of 2.67 g cm and microhardness of 4.9 – 5.8 GPa, which would give it an estimated strength-to-weight ratio comparable to ceramic materials such as silicon carbide, though the high cost of scandium limits the possible uses.