... light wave-length thick.MAGNESIUM ALLOYS. Although magnesium alloys are moderate instrength and rigidity, they have high specific strength and rigiditybecause of their low density, which, ... fabricated); O (annealed); H1 0 and H1 1 (slightly strain-hardened); H2 3, H2 4, and H2 6 (strain-hardened and partiallyannealed); T4 (solution heat-treated); T5 (artificially aged); T6 (solu-tion heat-treated ... inweight, and resistant to wear. It has also been used as a facing andshielding material in building construction; the light weight of mag-nesium gives high coverage, 1 lb (0.45 kg) of 0.005-in...