Liquid Structures of Metallic Glass-forming Binary Zr Alloys

摘要

We have analyzed liquid structures of the binary Zr-TM (TM=Pd, Cu, Ni) alloys as a function of composition to investigate relations with their glass-forming abilities. High-energy x-ray (E=113 keV) diffraction experiments were performed and a corneal nozzle levitation (CNL) technique was applied to achieve a containerless condition for highly reactive melts with high temperature Structure information of the liquid alloys has been obtained with the aid of reverse Monte Carlo simulation. A shoulder was found at high-g side of the second peak for the structure factor for Zr_(70)Pd_(30) as well as Zr_(70)Cu_(30) alloy Zr_(50)Cu_(50) alloys, which can be indication of the formation of ISRO in the liquid alloys. Liquid Zr-Ni alloys shows an apparent difference in the structure fectors between the Zr_(70)Ni_(30) and the Zr_(50)Ni_(50) alloys, which can be associated with the formation of the chemical short range ordering, whereas the Zr-Pd alloys show a typical random distribution of atoms.