This material is a metallic glass prepared by pouring molten alloy steel onto a rotating cooled wheel so fast that crystals do not form .
A rotating cooled wheel cools the metal at a rate of about one megakelvin per second .
This material is a metallic glass prepared by pouring molten alloy steel onto a rotating cooled wheel , which cools the metal at a rate of about one megakelvin per second , so fast that crystals do not form .