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Critical Cooling Rate and Thermal Stability in Zr-Ti-Cu-Ni-Be Bulk Metallic Glasses

Published online by Cambridge University Press:  17 March 2011

Theodore A. Waniuk ,
Jan Schroers  and
William L. Johnson
Theodore A. Waniuk
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125
Jan Schroers
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125
William L. Johnson
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125
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Abstract

The crystallization behavior of a series of alloys in the Zr-Ti-Cu-Ni-Be system is studied. Upon cooling from the molten state with different rates, alloys with compositions ranging along a tie line from (Zr75Ti25)55(Ni45Cu55)22.5Be22.5 (Vit1) to (Zr85Ti15)55(Ni57Cu43)17.5Be27.5 (Vit4) show a continuous increase in the critical cooling rate to suppress crystallization. In contrast, thermal analysis of the same alloys shows that the undercooled liquid region, the temperature difference between the glass transition temperature and the crystallization temperature, is largest for compositions midway between the two endpoints, revealing that glass forming ability does not correlate with thermal stability. The relationship between the change in glass forming ability and thermal stability is discussed with reference to a chemical decomposition process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L4.6
Copyright
Copyright © Materials Research Society 2001

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