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Structural and Electronic Properties of Zr-Ti-Cu-Ni-Be Alloys

Published online by Cambridge University Press:  17 March 2011

Jörg F. Löffler ,
X.-P. Tang ,
Yue Wu  and
William L. Johnsona
Jörg F. Löffler
Affiliation:
W. M. Keck Laboratory, California Institute of Technology, Pasadena, California 91125, U.S.A.
X.-P. Tang
Affiliation:
Department of Physics and Astronomy and Curriculum in Applied and Materials Sciences, University of North Carolina, Chapel Hill, North Carolina 27599-3255, U.S.A.
Yue Wu
Affiliation:
Department of Physics and Astronomy and Curriculum in Applied and Materials Sciences, University of North Carolina, Chapel Hill, North Carolina 27599-3255, U.S.A.
William L. Johnsona
Affiliation:
W. M. Keck Laboratory, California Institute of Technology, Pasadena, California 91125, U.S.A.
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Abstract

We present crystallization studies on Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vit1) and on other alloys, where the (Zr,Ti) and (Cu,Be) contents, along the line in composition space connecting Vit1 and Zr46.8Ti8.2Cu7.5Ni10Be27.5 (Vit4), were varied. Results from x-ray diffraction (XRD), small-angle neutron scattering (SANS) and differential scanning calorimetry (DSC) are combined to describe the crystallization behavior of these alloys at deep undercooling. SANS gives evidence for decomposition and the formation of nanometer sized crystals below a critical temperature Tc, which varies drastically as a function of composition. When Tc intersects with the glass transition temperature Tg, changes in the crystallization behavior are observed by DSC and XRD. At annealing temperatures near Tg, XRD resolves quasicrystalline phases for all alloy compositions from Vit1 to Vit4. From 9Be nuclear magnetic resonance (NMR) experiments performed on Vit1 upon annealing, we obtain information about the electronic structure and volume fraction of Be containing crystalline and quasicrystalline phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L1.9
Copyright
Copyright © Materials Research Society 2001

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