Solidification of binary and Sr-modified Al-Si eutectic alloys - Theoretical analysis of solute fields

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(92)90121-T· OSTI ID:7267303

Sens, H; Eustathopoulos, N; Camel, D; Favier, J J ^[1]

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1. CEA, Centre d'Etudes Nucleaires de Grenoble (France) Ecole Nationale Superieure d'Electrochimie et d'Electrometallurgie, Saint-Martin-d'Heres (France)

This paper analyzes experimental data in available literature concerning the eutectic spacing lambda and growth undercooling Delta-T in the Al-Si binary eutectic and in the strontium-modified eutectic. The expression for Delta-T obtained in Jackson and Hunt's model is used, before application of the minimum undercooling growth criterion. It is shown that, for the binary eutectic, the results can be interpreted quantitatively by means of this equation. On the other hand, it is shown that the results for the modified alloy cannot be interpreted on this basis and that a contribution of the kinetic undercooling for growth of Si has to be taken into account. A high level of kinetic undercooling is found (ranging from 5 to 15 K depending on the solidification rate). This analysis also predicts a significant silicon-enrichment of the interfacial liquid, especially in the modified eutectic (up to 2 wt pct). 13 refs.

• OSTI ID: 7267303
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 40:7; ISSN 0956-7151; ISSN AMATE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALKALINE EARTH METALS
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
BINARY ALLOY SYSTEMS
DIAGRAMS
ELEMENTS
METALS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
SILICON ALLOYS
SOLIDIFICATION
STRONTIUM
TEMPERATURE DEPENDENCE