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Fractal morphologies from decomposition of Fe−Ni−Invar alloys

Published online by Cambridge University Press:  31 January 2011

Q. Li ,
A. Wiedenmann  and
H. Wollenberger
Q. Li
Affiliation:
Hahn-Meitner-Institut Berlin, Glienicker Str. 100, D-14109 Berlin, Germany
A. Wiedenmann
Affiliation:
Hahn-Meitner-Institut Berlin, Glienicker Str. 100, D-14109 Berlin, Germany
H. Wollenberger
Affiliation:
Hahn-Meitner-Institut Berlin, Glienicker Str. 100, D-14109 Berlin, Germany
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Abstract

Small angle neutron scattering investigations performed on Fe1−x–Nix alloys with 0.26 ≤ x ≤ 0.45 revealed a thermodynamically driven decomposition below 800 °C. The miscibility gap extends at least from 30 at.% Ni to 45 at.% Ni. The diffusioncontrolled decomposition produces fractal morphologies during the early stages of the process. During annealing the structure of the precipitated phase densifies continuously from mass fractals with small dimensionality (1 ≤ dm ≤ 3) to surface fractals with 2 ≤ ds ≤ 3. The results are compared with recent simulations of aggregation and growth as well as with a new analysis of spinodal decomposition, both predicting fractal morphologies.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 1 , January 1997 , pp. 83 - 92
Copyright
Copyright © Materials Research Society 1997

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