FORMATION OF BULK METALLIC GLASS Pd40.5Ni40.5P19 BY SOLIDIFICATION WITHOUT CONTAINER IN A DROPPING TUBE
Pd40.5Ni40.5P19合金的无容器凝固及其大块金属玻璃的形成

The dispersed molten droplets of Pd40.5Ni40.5P19 alloy solidified during fall down in a 1.2 m drop-tube which is filled with purified helium at 0.8 atmosphere. Owing to solidificat ion without container occurring at high undercooling, the heterogeneous nucleation was inhibited and the metallic glass sphere of 2 mm in diameter was obtained, which is the largest one prepared by dropping tube up to now.