1999
DOI: 10.1103/physrevlett.82.2290
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Time Scales for Viscous Flow, Atomic Transport, and Crystallization in the Liquid and Supercooled Liquid States ofZr41.2Ti13.8

Abstract: The shear viscosity of liquid Zr 41.2 Ti 13.8 Cu 12.5 Ni 10.0 Be 22.5 has been measured. At the liquidus temperature we find an extremely high viscosity of 2.5 Pa s, 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 wi… Show more

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Cited by 260 publications
(177 citation statements)
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“…Vit 1 is a relatively ''strong'' liquid, 18 which means it exhibits a large viscosity around the melting point of 2.5 Pa s and a large apparent activation energy of 2.0 eV for flow. 6 This contrasts with most pure metals and alloys, which are considered ''fragile'' liquids with much lower viscosities at the melting point of 10 Ϫ3 Pa s and an apparent activation energy of 0.5 eV. 19 Thus, in general, the kinetics in other metallic systems is much faster than in Vit 1, resulting in rapid crystallization.…”
Section: ͑2͒mentioning
confidence: 84%
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“…Vit 1 is a relatively ''strong'' liquid, 18 which means it exhibits a large viscosity around the melting point of 2.5 Pa s and a large apparent activation energy of 2.0 eV for flow. 6 This contrasts with most pure metals and alloys, which are considered ''fragile'' liquids with much lower viscosities at the melting point of 10 Ϫ3 Pa s and an apparent activation energy of 0.5 eV. 19 Thus, in general, the kinetics in other metallic systems is much faster than in Vit 1, resulting in rapid crystallization.…”
Section: ͑2͒mentioning
confidence: 84%
“…The temperature dependence of the effective diffusivity is described by a hybrid equation that was proposed earlier. 6 The interfacial energy ϭ0.04 J/m 2 and Aϭ10 11.1 were taken from a least-squares fit to the isothermal temperature-time-transformation ͑TTT͒ diagram. 6 DSC results from Ref.…”
Section: ͑2͒mentioning
confidence: 99%
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“…Cooling rates as low as 1 K͞s allow for the casting of bulk metallic glass of up to 50 mm in the smallest dimension. The stability with respect to crystallization comes along with a viscosity of several Pa s at their liquidus temperatures [3,4], which is some 3 orders of magnitude larger than in simple metallic liquids. Hence, one expects atomic motion in the liquid state to differ from the microscopic dynamics in simple metals [5].…”
mentioning
confidence: 99%