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Influence of Some Trace Elements on Solidification Path and Microstructure of Al-Si Foundry Alloys

THOMAS HARTMUT LUDWIG, PAUL LOUIS SCHAFFER

2013enaluminumalloysmicrostructuresolidificationtrace elements

Abstract

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In this study, the effects of trace elements Ca, Ni, V, and Zn on the solidification path and microstructure of high purity binary Al-7wt pct Si and commercial purity A356 foundry alloys were investigated. A range of concentrations between 50 to 600 ppm of the trace elements was added, and thermal analysis techniques were utilized to assess nucleation and growth of different phases during solidification. The results demonstrated that additions of Ca and Ni significantly suppressed characteristic temperatures associated with the eutectic nucleation and growth by up to 4 K and 1.5 K, respectively. Additionally, Ca altered the morphology of the eutectic Si phase, with a concentration as low as 39 ppm resulting in the formation of the polyhedral Al2Si2Ca phase. Ni addition led to the creation of intermetallic phases, Al3Ni and Al9FeNi, when the concentration of Ni exceeded 300 ppm. In contrast, V and Zn did not show any significant effect on the cooling curve or microstructure, although V was found to preferentially accumulate in b-Al5FeSi particles. Overall, the study reveals critical insight into how trace elements can influence the properties of aluminum alloys used in foundry applications.

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Cite This Work

@article{397300ea-010a-40a1-8430-e03aa12a8d61,
  title={Influence of Some Trace Elements on Solidification Path and Microstructure of Al-Si Foundry Alloys},
  author={THOMAS HARTMUT LUDWIG and PAUL LOUIS SCHAFFER},
  year={2013},
  language={en}
}
TY  - JOUR
TI  - Influence of Some Trace Elements on Solidification Path and Microstructure of Al-Si Foundry Alloys
AU  - THOMAS HARTMUT LUDWIG
AU  - PAUL LOUIS SCHAFFER
PY  - 2013
LA  - en
ER  -

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