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Crystallization Kinetics In A Ni24Zr76Amorphous Alloy

Published online by Cambridge University Press:  15 February 2011

G. Ghosh  and
F.-R. Chen
G. Ghosh
Affiliation:
Dept of Materials Science and Engineering, Northwestern University, Evanston, IL 60208–3108
F.-R. Chen
Affiliation:
Materials Science Center, National Tsing Hua University, Kuang Fu Road, Hsinchu, Taiwan
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Abstract

Isothermal crystallization kinetics of Ni24Zr76amorphous alloy has been studied by differential scanning calorimetry (DSC).Theoretically estimated transient times are found to be consistent with theexperimentally observed incubation periods. The crystallization kinetics hasbeen analyzed in terms of Kolmogorov-Johnson-Mehl-Avrami (KJMA) Model andsignificant departure from the linear KJMA behavior was observed. Suchnon-linearity is due to the surface-induced crystallization, anisotropiegrowth of the crystals, impingement effects and variation of the nucleationrate during crystallization etc. By applying high-resolution electronMicroscopy (HREM), it has been shown that the nucleation and growth of thecrystals do not take place at a constant state of disorder.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 289
Copyright
Copyright © Materials Research Society 1994

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References

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