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The Precipitate-Nucleation in the Vicinity of Solubility Limit

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Abstract:

The critical minimum size of stable precipitate in the vicinity of edge of miscibility gap is experimentally determined for the Ni3Si precipitate particle in Ni-Si, Ni3Al in Ni-Al, Cu4Ti in Cu-Ti and Co in Cu-Co binary alloy systems by utilizing the macroscopic composition gradient method recently proposed. The results obtained are as follows: The critical nucleus size shows a rapid increase to several tens of nm in a very narrow composition region less than 0.3at% from the phase boundary. Such a big critical size of nucleus is statistically rationalized by the conventional nucleation theories.

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Periodical:

Materials Science Forum (Volume 502)

Pages:

139-144

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.502.139

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Online since:

December 2005

Authors:

Toru Miyazaki, Takao Kozakai, Claudio G. Schoen

Keywords:

Critical Nucleus Size, Edge of Miscibility Gap, Macroscopic Composition Gradient (MCG) Method

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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