Journal
4TH INTERNATIONAL SYMPOSIUM ON SLOW DYNAMICS IN COMPLEX SYSTEMS: KEEP GOING TOHOKU
Volume 1518, Issue -, Pages 197-205Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4794568
Keywords
Bulk metallic glasses; viscosity; polyamorphism; short-range order; fragile-strong transition
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The molten viscous behavior of the Vitreloy 106, 106a, 105 and 101 bulk metallic glass-forming alloys is investigated at temperatures above T-liq. Couette concentric cylinder viscometry is used to determine the isothermal and continuous cooling melt viscosities. Isothermal three-point beam-bending measurements of the viscosity in the vicinity of T-g reveal a kinetically stronger liquid at low temperatures than at high temperatures near T-liq. This behavior is revealed to be the result of a fragile-to-strong transition in the undercooled liquid, possibly due to polyamorphism.
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