Carbon steel = hard + brittle + rusts
Amorphous alloys = hard + tough + corrosion resistant
Would make good swords, too, eh Swordmaker?
Sounds like mithril in the Lord of the Rings:
Mithril! All folk desired it. It could be beaten like copper, and polished like glass; and the Dwarves could make of it a metal, light and yet harder than tempered steel. Its beauty was like to that of common silver, but the beauty of mithril did not tarnish or grow dim."
Bilbo gave Frodo some mail made of mithril to protect him on his journey to the Cracks of Doom.
I wonder if this liquid metals stuff will have any applications in the manufacture of body armor?