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Viscosity, Relaxation and Crystallization Kinetics In Zr-Ti-Cu-Ni-Be Strong Bulk Metallic Glass Forming Liquids

Published online by Cambridge University Press:  10 February 2011

Ralf Busch ,
Andreas Masuhr ,
Eric Bakke ,
T. Andy Waniuk  and
William L. Johnson
Ralf Busch
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125
Andreas Masuhr
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125
Eric Bakke
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125
T. Andy Waniuk
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125
William L. Johnson
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125
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Abstract

The high thermal stability of bulk metallic glass (BMG) forming liquids in the undercooled state allows for measurements of thermophysical properties in a large time and temperature window. In this contribution, results on viscous flow, relaxation and crystallization of Zr-Ti-Cu- Ni-Be BMG forming alloys are presented. The data are compared with the kinetics of other metallic and non-metallic liquids. BMG formers are relatively strong liquids with melt viscosities that are about three orders of magnitude larger than in pure metals and other alloys. The strong liquid behavior of these alloys is also reflected by a small entropy of fusion and a weak temperature dependence of the thermodynamic functions upon undercooling. The high viscosity and small driving force for crystallization are major contributing factors to the high glass forming ability and low critical cooling rate. The upper portions of experimental timetemperature- transformation diagrams down to the crystallization nose can be described well using the kinetics deduced from the viscosity data. For lower temperature the viscosity can not describe the crystallization kinetics. The time scale for structural relaxation becomes larger than for diffusive hopping processes. Diffusion stays relatively fast, whereas viscosity and structural relaxation time upon undercooling follow a Vogel-Fulcher-Tammann relation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 554: Symposium MM – Bulk Metallic Glasses , 1998 , 223
Copyright
Copyright © Materials Research Society 1999

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