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Microstructural characterization and solidification behavior of atomized Al–Fe powders

Published online by Cambridge University Press:  31 January 2011

Y. Zhou,
J. A. Juarez-Islas,
O. Alvarez-Fregoso,
W. Y. Yoon and
E. J. Lavernia
Y. Zhou
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92717-2575
J. A. Juarez-Islas
Affiliation:
Instituto de Investigaciones en Materiales, UNAM, Mexico, D.F., 04510, Mexico
O. Alvarez-Fregoso
Affiliation:
Instituto de Investigaciones en Materiales, UNAM, Mexico, D.F., 04510, Mexico
W. Y. Yoon
Affiliation:
Department of Metallurgical Engineering, Korea University, Seoul, 136-701, Korea
E. J. Lavernia
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92717-2575
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Abstract

The effect of solidification history on the resultant microstructure in atomized Al–2.56 wt% Fe and Al–6.0 wt% Fe powders was studied, with particular emphasis on droplet size, undercooling, and phase stability. The atomized Al–Fe powders exhibited four microstructural features, i.e., Al3Fe phase (now known as Al13Fe4), Al + Al6Fe, α–Al dendrite, and a predendritic microstructure. The presence of these phases was noted to depend on alloy composition and a kinetic phase competitive growth mechanism due to the initial undercooling experienced by the powders. The occurrence of structures of the predendritic, cellular, and/or dendritic type was properly predicted by the theory of dendrite growth into undercooled alloy melts for the case of large undercoolings.

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Articles
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Journal of Materials Research , Volume 14 , Issue 3 , March 1999, pp. 729 - 736
Copyright
Copyright © Materials Research Society 1999

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