Microstructural characterization and solidification behavior of atomized Al-Fe powders

Y. Zhou; J. A. Juarez-Islas; O. Alvarez-Fregoso; W. Y. Yoon; E. J. Lavernia

doi:10.1557/JMR.1999.0098

Microstructural characterization and solidification behavior of atomized Al-Fe powders

Y. Zhou, J. A. Juarez-Islas, O. Alvarez-Fregoso, W. Y. Yoon, E. J. Lavernia

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

3 Citations (Scopus)

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), A1 + 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.

Original language	English
Pages (from-to)	729-736
Number of pages	8
Journal	Journal of Materials Research
Volume	14
Issue number	3
DOIs	https://doi.org/10.1557/JMR.1999.0098
Publication status	Published - 1999 Mar

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Zhou, Y., Juarez-Islas, J. A., Alvarez-Fregoso, O., Yoon, W. Y., & Lavernia, E. J. (1999). Microstructural characterization and solidification behavior of atomized Al-Fe powders. Journal of Materials Research, 14(3), 729-736. https://doi.org/10.1557/JMR.1999.0098

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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), A1 + 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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