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Phase Equilibria and Glass Forming Ability in the Zr-Cu-Ni-Al System

Published online by Cambridge University Press:  17 March 2011

Douglas J. Swenson  and
Sreenivas Bhattiprolu
Douglas J. Swenson
Affiliation:
Department of Materials Science and Engineering Michigan Technological University 1400 Townsend Drive, Houghton, MI 49931, U.S.A.
Sreenivas Bhattiprolu
Affiliation:
Department of Materials Science and Engineering Michigan Technological University 1400 Townsend Drive, Houghton, MI 49931, U.S.A.
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Abstract

The constitution of the 66.67 at.% Zr isopleth of the Zr-Cu-Ni-Al quaternary system has been studied, utilizing X-ray diffraction and electron probe microanalysis to establish phase equilibria at 800°C, and differential scanning calorimetry to study the liquidus hypersurface. As would be expected in a four-component system, phase equilibria were found to be complex. However, it was determined that the isoplethal subsection Zr2Cu-Zr2Ni is pseudobinary, and subsequently a large portion of the quaternary isopleth is pseudoternary, comprising equilibria involving the phases Zr2Cu, Zr2Ni and Zr6NiAl2. Moreover, these three phases participate in a pseudoternary eutectic reaction: L → Zr2Cu + Zr2Ni + Zr6NiAl2 at 852°C. Utilizing the thermal analysis data, the composition of the eutectic point was estimated to lie very near that of the well-known bulk metallic glass forming alloy Zr65Cu17.5Ni10Al7.5. The compositional proximity of a “deep” eutectic valley to this quaternary alloy thus provides a thermodynamic rationale for its high glass forming ability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L4.4
Copyright
Copyright © Materials Research Society 2001

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