TY - JOUR
T1 - Microstructural characterization and solidification behavior of atomized Al-Fe powders
AU - Zhou, Y.
AU - Juarez-Islas, J. A.
AU - Alvarez-Fregoso, O.
AU - Yoon, W. Y.
AU - Lavernia, E. J.
N1 - 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.
PY - 1999/3
Y1 - 1999/3
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0033099477&partnerID=8YFLogxK
U2 - 10.1557/JMR.1999.0098
DO - 10.1557/JMR.1999.0098
M3 - Article
AN - SCOPUS:0033099477
VL - 14
SP - 729
EP - 736
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 3
ER -