Surface Tension and Viscosity of Quasicrystal‐Forming Ti–Zr–Ni Alloys

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• 作者：Hyers ; R. W. ; Bradshaw ; R. C. ; Rogers ; J. R. ; Rathz ; T. J. ; Lee ; G. W. ; Gangopadhyay ; A. K. ; Kelton ; K. F.
• 关键词：electrostatic levitation ; quasicrystal ; surface tension ; Ti– ; Zr– ; Ni alloys ; viscosity
• 刊名：International Journal of Thermophysics
• 出版年：2004
• 出版时间：2004
• 年：2004
• 卷：25
• 期：4
• 页码：1155-1162
• 全文大小：85 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Mechanics
  Industrial Chemistry and Chemical Engineering
  Physical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-9567

文摘

Recent X‐ray scattering measurements show that icosahedral short‐range order in Ti–Zr–Ni alloys is responsible for a change in phase selection from the stable C14 Laves phase to the quasicrystalline icosahedral phase, and that icosahedral short‐range order increases at deeper undercoolings. This change in short‐range order should be reflected in changes in the thermophysical properties of the melt. The surface tension and viscosity of quasicrystal‐forming Ti–Zr–Ni alloys were measured over a range of temperature, including both stable and undercooled liquids, by an electrostatic levitation (ESL) technique. ESL is a containerless technique which allows processing of samples without contact, greatly reducing contamination and increasing access to the metastable undercooled liquid. The measured viscosity is typical of glass‐forming alloys of similar composition to the quasicrystal‐forming alloys studied here; however, the surface tension shows an anomaly at deep undercoolings.