Time Scales for Viscous Flow, Atomic Transport, and Crystallization in the Liquid and Supercooled Liquid States of Zr[sub 41. 2 ] Ti[sub 1 3. 8] Cu[sub 12. 5] Ni[sub 10. 0] Be[sub 22. 5]
- W. M. Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, California 91125 (United States)
The shear viscosity of liquid Zr[sub 41.2] Ti[sub 13.8] Cu[sub 12.5] Ni[sub 10.0] Be[sub 22.5] has been measured. At the liquidus temperature we find an extremely high viscosity of 2.5thinspthinspPathinsps, favoring glass formation. At deep supercooling the time scales for the diffusion of small and medium sized atoms as reported in the literature decouple from the internal relaxation time as probed by our viscosity measurements. Similarly, crystallization from the supercooled liquid state can be described with an effective diffusivity that scales with the viscosity at high temperatures and is Arrhenius-like at deep supercooling. [copyright] [ital 1999] [ital The American Physical Society]
- DOE Contract Number:
- FG03-86ER45242
- OSTI ID:
- 6449578
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Vol. 82:11; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
ALLOYS
ARRHENIUS EQUATION
BERYLLIUM ALLOYS
COPPER ALLOYS
CRYSTALLIZATION
DIFFUSION
ELEMENTS
EQUATIONS
FLUID FLOW
FLUIDS
LIQUID METALS
LIQUIDS
METALS
NICKEL ALLOYS
PHASE TRANSFORMATIONS
RELAXATION TIME
SCALING
TITANIUM ALLOYS
VISCOUS FLOW
ZIRCONIUM ALLOYS