AustralieFrV1, Main, Exploration, bibRecord, 006548

X-Ray Videomicroscopy Studies of Eutectic Al-Si Solidification in Al-Si-Cu

Identifieur interne : 006548 ( Main/Exploration ); précédent : 006547; suivant : 006549

X-Ray Videomicroscopy Studies of Eutectic Al-Si Solidification in Al-Si-Cu

Auteurs : R. H. Mathiesen [Norvège] ; L. Arnberg [Norvège] ; Y. Li [Allemagne] ; V. Meier [Norvège] ; P. L. Schaffer [Norvège] ; I. Snigireva [France] ; A. Snigirev [France] ; A. K. Dahle [Australie]

Source :

Metallurgical and materials transactions. A, Physical metallurgy and materials science [ 1073-5623 ] ; 2011.

RBID : Pascal:11-0309973

Descripteurs français

Pascal (Inist)
- Eutectique, Microstructure, Solidification.

English descriptors

KwdEn :
- Eutectic, Microstructure, Solidification.

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.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">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.</div>
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X-Ray Videomicroscopy Studies of Eutectic Al-Si Solidification in Al-Si-Cu

X-Ray Videomicroscopy Studies of Eutectic Al-Si Solidification in Al-Si-Cu

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri