X-ray videomicroscopy studies of eutectic Al-Si solidification in Al-Si-Cu

Mathiesen, R. H., Arnberg, L., Li, Y., Meier, V., Schaffer, P. L., Snigireva, I., Snigirev, A. and Dahle, A. K. (2011) X-ray videomicroscopy studies of eutectic Al-Si solidification in Al-Si-Cu. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 42A 1: 170-180. doi:10.1007/s11661-010-0443-8


Author Mathiesen, R. H.
Arnberg, L.
Li, Y.
Meier, V.
Schaffer, P. L.
Snigireva, I.
Snigirev, A.
Dahle, A. K.
Title X-ray videomicroscopy studies of eutectic Al-Si solidification in Al-Si-Cu
Journal name Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   Check publisher's open access policy
ISSN 1073-5623
1543-1940
Publication date 2011-01
Year available 2010
Sub-type Article (original research)
DOI 10.1007/s11661-010-0443-8
Volume 42A
Issue 1
Start page 170
End page 180
Total pages 11
Place of publication New York, United States
Publisher Springer New York LLC
Collection year 2011
Language eng
Formatted abstract
Al-Si eutectic growth has been studied in-situ for the first time using X-ray video microscopy during directional solidification (DS) in unmodified and Sr-modified Al-Si-Cu alloys. In the unmodified alloys, Si is found to grow predominantly with needle-like tip morphologies, leading a highly irregular progressing eutectic interface with subsequent nucleation and growth of Al from the Si surfaces. In the Sr-modified alloys, the eutectic reaction is strongly suppressed, occurring with low nucleation frequency at undercoolings in the range 10 K to 18 K. In order to transport Cu rejected at the eutectic front back into the melt, the modified eutectic colonies attain meso-scale interface perturbations that eventually evolve into equiaxed composite-structure cells. The eutectic front also attains short-range microscale interface perturbations consistent with the characteristics of a fibrous Si growth. Evidence was found in support of Si nucleation occurring on potent particles suspended in the melt. Yet, both with Sr-modified and unmodified alloys, Si precipitation alone was not sufficient to facilitate the eutectic reaction, which apparently required additional undercooling for Al to form at the Si-particle interfaces.
© 2010 The Author(s).
Keyword Aluminum-silicon alloys
Real-time
In-situ
Equiaxed transition
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article published online October 19, 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2011 Collection
 
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Created: Sun, 13 Mar 2011, 00:08:46 EST