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Phase Equilibria in the Zr-Cu-Al System: Implications for Bulk Metallic Glass Formation

Published online by Cambridge University Press:  10 February 2011

S. A. Syed  and
D. Swenson
S. A. Syed
Affiliation:
Department of Metallurgical and Materials Engineering, Michigan Technological University 1400 Townsend Drive, Houghton, MI 49931
D. Swenson
Affiliation:
Department of Metallurgical and Materials Engineering, Michigan Technological University 1400 Townsend Drive, Houghton, MI 49931
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Abstract

Preliminary phase equilibrium relationships have been established in the Zr-Cu-Al system at 800 °C, using a combination of X-ray diffraction and electron probe microanalysis. These results are similar to previous investigations that have been reported in the literature. Several ternary phases are found to exist in this system, many of which lie within the gross compositional vicinity of interest to bulk amorphous alloy formation. The equilibrium phases present in the alloy Zr65Cu27.5A17.5, which exhibits a particularly high Tx-Tg in the amorphous state, are Zr2Cu and minor amounts of two additional phases: Zr3Al and what may be a ternary phase with a composition near Zr6CuAl3. When the 800 °C phase diagram isotherm is correlated with the known glass forming composition range of the Zr-Cu-Al system, it is found that the best glass forming behavior is confined to those regions of the diagram in which all equilibria include Zr-Cu constituent binary phases and Al-poor ternary phases. This may suggest that difficulties in the nucleation of these binary phases plays a role in the glass forming ability of Zr-Cu-Al and related higher order alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 554: Symposium MM – Bulk Metallic Glasses , 1998 , 131
Copyright
Copyright © Materials Research Society 1999

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