无容器过程中Pd-Ni-P系合金的过冷及金属玻璃形成

RESEARCH OF UNDERCOOLING AND FORMATION OF BULK METALLIC GLASS OF Pd-Ni-P SYSTEM IN A CONTAINERLESS PROCESSING

在1.2m落管中对Pd_(43.5)Ni_(43.5)P_(13)和Pd_(40)Ni_(40)P_(20)合金进行了无容器过冷实验。通过在落管中充以不同的惰性气体,从而调节过冷液滴的散热条件,研究了冷却速率对于Pd_(40)Ni_(40)P_(20)合金的玻璃形成、晶体成核和长大的影响。确定了在落管中形成玻璃的临界冷却速率。此外,液滴下落以前的初始温度也与玻璃形成、晶体的成核和长大有密切联系。

Undercooling experiments of Pd43.5Ni43.5P13 and Pd40Ni40P20 alloys were performed in a 1.2 m drop tube. The effect of cooling rates on the glass formation, nucleation and crystal growth of the Pd40Ni40P20, alloy was studied by filling the various inert gas in the tube. The critical cooling rate for the glass formation in the tube was determined. In addition, it is indicated that the initial temperature of the drop before it droped down is related closely to the nucleation and crystal growth of the alloy.