Heterogeneous nucleation of the primary phase in the rapid solidification of Al-4.5wt%Cu alloy droplet

This paper reports on rapid solidification of Al-Cu alloys. A heterogeneous nucleation growth model coupled with a thermal model of a falling droplet through a stagnant gas was developed. The primary undercooling as well as the number of nucleation points was compared with Al-Cu alloy droplets produ...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2015-06, Vol.84 (1), p.12013
Main Authors: Maitre, A, Bogno, A-A, Bedel, M, Reinhart, G, Henein, H
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Atomizing
Copper
COPPER ALUMINUM ALLOYS
Droplets
Engineering Sciences
Growth models
Liquidus
MATHEMATICAL ANALYSIS
Mathematical models
NEUTRON DIFFRACTION
NUCLEATION
PHASES
Rapid solidification
SOLIDIFICATION
Solidus
Supercooling
Synchrotron radiation
Synchrotrons
Thermal analysis
Undercooling
X ray microtomography
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Summary:This paper reports on rapid solidification of Al-Cu alloys. A heterogeneous nucleation growth model coupled with a thermal model of a falling droplet through a stagnant gas was developed. The primary undercooling as well as the number of nucleation points was compared with Al-Cu alloy droplets produced by Impulse Atomization (IA). Based on experimental results from Neutron Diffraction, secondary (eutectic) phases were obtained. Then, primary and secondary undercoolings were estimated using the metastable extensions of solidus and liquidus lines calculated by Thermo-Calc. Moreover, Synchrotron X-ray microtomography has been performed on Al-4.5wt%Cu droplets. The undercoolings are in good agreement. Results also evidence the presence of one nucleation point and are in agreement with the experimental observations.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/84/1/012013