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Glass Formation and Phase Separation In The Vitreloy Type Bulk Metallic Glasses

Published online by Cambridge University Press:  10 February 2011

Charles C. Hays ,
Paul Kim  and
William L. Johnson
Charles C. Hays
Affiliation:
California Institute of Technology Department of Materials Science & Engineering W. M. Keck Laboratory for Engineering Materials 138–78 Pasadena, CA 91125 USA
Paul Kim
Affiliation:
California Institute of Technology Department of Materials Science & Engineering W. M. Keck Laboratory for Engineering Materials 138–78 Pasadena, CA 91125 USA
William L. Johnson
Affiliation:
California Institute of Technology Department of Materials Science & Engineering W. M. Keck Laboratory for Engineering Materials 138–78 Pasadena, CA 91125 USA
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Abstract

Results of calorimetric, differential thermal analysis, and structural measurements are presented for a series of bulk metallic glass forming compositions in the Zr-Ti-Cu-Ni-Be alloy system. The structural data identify the competing crystalline phases, formed on cooling from the liquid state, for various compositions in the Zr-Ti-X quasi-ternary phase diagram; with the Cu-Ni-Be ratio given by X = Be9Cu5Ni4. For this region of the ndimensional phase space (n=5), the bulk glass forming range is extensive and the calorimetric data exhibit thermal features associated with the occurrence of phase separation in the undercooled liquid state prior to primary crystallization. The topology of the composition manifold is complex; manifest by dramatic changes in crystallization behavior for small changes in the Zr-Ti-X ratio. Alloys with large supercooled liquid regions, Δ, are observed; ΔT≈ 135 K. Zr-Ti-Cu-Ni-Be alloy compositions with eutectic temperatures less than that of pure Al (Tm = 933 K) were also synthesized.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 554: Symposium MM – Bulk Metallic Glasses , 1998 , 243
Copyright
Copyright © Materials Research Society 1999

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