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Crystallization and nanoindentation behavior of a bulk Zr–Al–Ti–Cu–Ni amorphous alloy

Published online by Cambridge University Press:  31 January 2011

J. G. Wang ,
B. W. Choi ,
T. G. Nieh  and
C. T. Liu
J. G. Wang*
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, California 92697
B. W. Choi
Affiliation:
Chemistry and Materials Science, Lawrence Livermore National Laboratory, P.O. Box 808, L-350, Livermore, California 94551–9900
T. G. Nieh
Affiliation:
Chemistry and Materials Science, Lawrence Livermore National Laboratory, P.O. Box 808, L-350, Livermore, California 94551–9900
C. T. Liu
Affiliation:
Metals and Ceramics Division, P.O. Box 2008, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6376
*
a)Address all correspondence to this author. e-mail: wangjg@uci.edu
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Abstract

The crystallization and nanoindentation behavior of a Zr–10Al–5Ti–17.9Cu–14.6Ni (at.%) bulk amorphous alloy (BAA) were studied. Resulting from the kinetic nature of phase transformation in multicomponent alloys, the crystallization path is complex. Despite the complexity of different crystallization paths, the main final crystallized product in the Zr-based BAA is Zr2Cu. Young's modulus and hardness of the BAA were found to increase with an increase in annealing temperature. The observed mechanical properties were correlated with the microstructure of the material. Also, in the present paper, both the observed crystallization and nanoindentation behavior are compared with existing data. Zr-based BAAs exhibit a ratio of hardness to Young's modulus (H/E ratio) of about 1/10, suggesting the interatomic bonding in the alloys is close to being covalent.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 3 , March 2000 , pp. 798 - 807
Copyright
Copyright © Materials Research Society 2000

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