Paper Title:

In Situ Observation of Solidification of Bulk Metallic Glass Forming Alloys from Supercooled Liquid by Using High Energy X-Ray Diffraction Combined with Levitation Techniques

Periodical Materials Science Forum (Volumes 638 - 642)
Main Theme THERMEC 2009
Edited by T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
Pages 1677-1682
DOI 10.4028/www.scientific.net/MSF.638-642.1677
Citation Masahito Watanabe et al., 2010, Materials Science Forum, 638-642, 1677
Online since January 2010
Authors Masahito Watanabe, Akitoshi Mizuno, Toshihiko Akimoto, Shinji Kohara
Keywords Bulk Metallic Glass (BMG), Levitation, Supercooled Liquid, X-Ray Diffraction (XRD)
Price US$ 28,-
Share
Article Preview
View full size

It is well known that multi-component alloys form bulk metallic glasses (BMGs) from the supercooled liquid state without rapid quenching. However, the mechanism of phase selection between crystal and glass states has not been fully clarified. To obtain an insight into the glass-forming processes, we carried out in-situ observation on the solidification of Zr-based BMG-forming alloys from its supercooled liquids by time-resolved X-ray diffraction combined with the conical nozzle levitation (CNL) technique to achieve a containerless melting. For Zr-based alloys, we succeeded in detecting the X-ray diffraction patterns during glass formation from the supercooled liquid state as well as the crystallization from the liquid state. Furthermore we performed the precise structure analysis of supercooled state of Zr-based binary liquids. Based on the liquid structure and in-situ observation results, we discussed about the phase selection mechanism between crystal and glass states.