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Short-Range Order and Nanocrystallization in Amorphous Zr-Ti-Cu-Ni-Al

Published online by Cambridge University Press:  15 February 2011

L. Q. Xing ,
Xiaofeng Gu ,
T. A. Lusby ,
A. J. Melmed  and
T. C. Hufnagel
L. Q. Xing
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
Xiaofeng Gu
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
T. A. Lusby
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
A. J. Melmed
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
T. C. Hufnagel
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
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Abstract

We have examined the effect of Ti content on the crystallization kinetics of Zr-based amorphous alloys. In Zr59Ti3Cu20Ni8Al10, annealing above the glass transition temperature produces 50-100 nm crystalline precipitates, as seen in transmission electron microscope images. In contrast, TEM images and diffraction patterns from annealed Zr54.5Ti7.5Cu20Ni8Al10 show no evidence of crystalline phase formation. Structural changes upon annealing do occur in this alloy, however, as revealed by field ion microscopy. The effect of Ti is to favor the formation of clusters of short-range order; this tendency for clustering is apparently the cause of difference in crystallization behavior between the two alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 580: Symposium E – Nucleation & Growth Processes in Materials , 1999 , 381
Copyright
Copyright © Materials Research Society 2000

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