Composition dependence of crystal growth and its time evolution in supercooled liquid of Zr–Al–Cu glassy metals
Materials Science and Engineering: B(2006)
Abstract
Crystal nucleation and its time evolution during isothermal annealing in supercooled liquid of glassy metals Zr65Al10Cu25 ribbon, Zr50Al10Cu40 ribbon, and Zr50Al10Cu40 bulk are examined using a technique of differential thermal analysis. Time dependence of the fraction of crystallization in supercooled liquid at several temperatures is analyzed by the Johnson–Mehl–Avrami (JMA) formula. The Avrami exponents are 3.0±0.2 for Zr65Al10Cu25 ribbon, and 3.9±0.4 for Zr50Al10Cu40 ribbon and Zr50Al10Cu40 bulk. Relation between grown crystals in the supercooled liquid and the Avrami exponent can be explained reasonably. Plots of the fraction of crystallized volume versus a scaled time normalized by the half time of full crystallization almost collapse on a single curve. This suggests that the crystal growth obeys a universal process. The temperature dependence of the half time is discussed using the Williams–Landel–Ferry function.
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Key words
Zr-based glassy metal,Supercooled liquid,Crystal growth,Avrami exponent,Scaling law,Diffusion-controlled process
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