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

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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.

Original languageEnglish
Pages (from-to)729-736
Number of pages8
JournalJournal of Materials Research
Volume14
Issue number3
DOIs
Publication statusPublished - 1999 Mar

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ASJC Scopus subject areas

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

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