Directional and rapid solidification of Al–Nb–Ni ternary eutectic alloy

Al–Nb–Ni alloy system exhibits ternary eutectic transformation during solidification, resulting in in situ Al3Nb–Nb2Al–AlNbNi composite material. This paper investigates the influence of the cooling rate on the solidification microstructure of the eutectic Al–Nb–Ni alloy, under equilibrium and non-e...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2004-07, Vol.375-377, p.565-570
Main Authors: Triveño Rios, C., Oliveira, M.F., Caram, R., Botta F, W.J., Bolfarini, C., Kiminami, C.S.
Format: Article
Language:English
Subjects:
Directional solidification
Rapid solidification
Ternary eutectic
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Al–Nb–Ni alloy system exhibits ternary eutectic transformation during solidification, resulting in in situ Al3Nb–Nb2Al–AlNbNi composite material. This paper investigates the influence of the cooling rate on the solidification microstructure of the eutectic Al–Nb–Ni alloy, under equilibrium and non-equilibrium solidification conditions. Al57.2Nb40.4Ni2.4 eutectic alloy was directionally solidified using the Bridgman method and also rapidly solidified by melt-spinning process. The samples were characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Solidification with lower growth rate resulted in eutectic structure consisting of three solid phases in very regular arrangement, with fibrous morphology. However, solidification with very high growth rates resulted in a very refined and irregular eutectic, revealing changes in the eutectic morphology from rod-type to eutectic cell and supersaturated structures.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2003.10.187