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Solidification Sequence and Evolution of Microstructure During Rheocasting of Four Al-Si-Mg-Fe Alloys with Low Si Content

MOSTAFA PAYANDEH, ANDERS E.W. JARFORS

2016enrheocastingmicrostructurealuminumsolidificationalloys

Abstract

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This study investigates the solidification sequence and microstructure evolution during the rheocasting of four Al-Si-Mg-Fe alloys with low silicon content, specifically varying from 1.6 to 4.5 wt pct. The primary objective was to analyze the effects of Si concentration and particle size in the α-Al phase throughout the rheocasting process. A vertical high-pressure die casting machine was employed, using the RheoMetal/C228 process to prepare the slurry. The methodology involved detailed measurements of particle sizes and Si distributions in the α-Al particles in both the slurry and as-rheocast components. Results indicated a consistent distribution of Si within the globular α1-Al particles, with minimal size increase during pouring and secondary solidification. Two distinct types of α-Al particles, α2-Al and α3-Al, emerged from two separate nucleation events post-slurry production, suggesting a sequential precipitation process. The analysis revealed variable Si distributions within the α1-Al particles, categorized into three zones: unaffected, transition, and early dendritic/cellular zones. Additionally, dendritic growth of the α1-Al particles concomitantly occurred with the final eutectic reaction, intensifying further with the increased presence of the Al-Si eutectic phase.

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Cite This Work

@article{4765bfa8-8f36-4507-96f3-6303a6e54e28,
  title={Solidification Sequence and Evolution of Microstructure During Rheocasting of Four Al-Si-Mg-Fe Alloys with Low Si Content},
  author={MOSTAFA PAYANDEH and ANDERS E.W. JARFORS},
  year={2016},
  language={en}
}
TY  - JOUR
TI  - Solidification Sequence and Evolution of Microstructure During Rheocasting of Four Al-Si-Mg-Fe Alloys with Low Si Content
AU  - MOSTAFA PAYANDEH
AU  - ANDERS E.W. JARFORS
PY  - 2016
LA  - en
ER  -

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