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 |
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Pages (from-to) | 729-736 |
Number of pages | 8 |
Journal | Journal of Materials Research |
Volume | 14 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1999 Mar |
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering