| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1531880 | Materials Science and Engineering: B | 2006 | 8 Pages |
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.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
T. Fukami, H. Yamamoto, D. Okai, Y. Yokoyama, T. Yamasaki, A. Inoue,