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Composition Dependence of Phase Separation and Crystallization in Deeply Undercooled Zr-(Ti-)Cu-Ni-Al Alloys

Published online by Cambridge University Press:  17 March 2011

Andreas A. Kündig ,
Jörg F. Löffler  and
William L. Johnson
Andreas A. Kündig
Affiliation:
W. M. Keck Laboratory, California Institute of Technology, Pasadena, California 91125, U.S.A. Institut für Metallforschung, ETH Zürich, CH-8092 Zürich, Switzerland
Jörg F. Löffler
Affiliation:
W. M. Keck Laboratory, California Institute of Technology, Pasadena, California 91125, U.S.A.
William L. Johnson
Affiliation:
W. M. Keck Laboratory, California Institute of Technology, Pasadena, California 91125, U.S.A.
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Abstract

Different bulk glass forming alloys in the neighborhood of Zr52.5Cu17.9Ni14.6Al10Ti5 (Vit105) have been investigated by differential scanning calorimetry (DSC), x-ray diffraction (XRD) and small-angle neutron scattering (SANS). Along the Ti/Al line in composition space, Zr52.5Cu17.9Ni14.6Al10−xTi5+x with – ≤ x ≤ +2.5, the glass transition temperature, Tg, and the undercooled liquid regime (the difference between the first crystallization temperature and the glass transition temperature) continually decrease with increasing x. SANS measurements of annealed alloys show interference maxima, giving evidence for decomposition on the nanometer scale, up to a critical temperature Tc. In contrast to Tg, Tc increases with x and thus intercepts with Tg in the range –2.5 ≤ x ≤ –1.25, depending on the time scale of the experiment. At this composi- tion, significant changes in DSC traces and XRD patterns are observed. Additional isothermal DSC experiments show that the onset times for crystallization are significantly different for temperatures below and above Tc. We conclude that Tc, respectively the relation between Tc and Tg, determines the crystallization behavior and the thermal stability of these bulk metallic glasses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L5.6
Copyright
Copyright © Materials Research Society 2001

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