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

Research output: Contribution to journalArticlepeer-review

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

Bibliographical note

Funding Information:
Support from NASA under Grant No. NAGI-1619 and NSF INT-9600517 are gratefully acknowledged. The authors would like to thank Dr. Y. Wu and Dr. X. Liang for insightful discussions as well as contributions to the experimental work, and Mr. E. A. Caballero-Rodriguez for his technical support.

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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