Paper Title:
The Contribution of Diffusion Coefficient to the Eutectic Instability and Amorphous Phase Formation
  Abstract

The diffusion coefficient D decides the diffusion length of solute boundary and plays a key role in the microstructure selection. This paper examines quantitatively the contribution of diffusion coefficient to the eutectic instability and amorphorization ability. The maximum growth velocity Vmax and the maximum undercooling Tmax as functions of activation energy Q in strong liquids are deduced theoretically based on eutectic growth model by separating Q from D. It reveals that the larger the Q, the smaller the Tmax and Vmax, which shows the same tendency as experimental values in some Al-based alloys and glass formers. This indicates that it is the sluggish movement of atoms that makes the transition from eutectic to others structural morphologies, even to amorphous phase, occur at smaller interface growth velocity or undercooling, which is the main contribution of the diffusion coefficient to the amorphorization ability.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
1355-1358
DOI
10.4028/www.scientific.net/MSF.654-656.1355
Citation
N. Wang, X. Wang, W. J. Yao, "The Contribution of Diffusion Coefficient to the Eutectic Instability and Amorphous Phase Formation", Materials Science Forum, Vols. 654-656, pp. 1355-1358, 2010
Online since
June 2010
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Price
$35.00
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