Effect of phosphorus and strontium additions on formation temperature and nucleation density of primary silicon in Al-19 Wt Pct Si alloy and their effect on eutectic temperature

Masoumeh Faraji, Iain Todd, Howard Jones

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The influence of P and Sr additions on the formation temperature and nucleation density of primary silicon in Al-19 wt pct Si alloy has been determined, for small volumes of melt solidified at cooling rates T˙ of ~0.3 and 1 K/s. The proportion of ingot featuring primary silicon decreased progressively with increased Sr addition, which also markedly reduced the temperature for first formation of primary silicon and the number of primary silicon particles per unit volume N¯v. When combined with previously published results, the effects of amount of P addition and cooling rate on N¯v are in reasonable accord with N¯v/T˙=(π/6f)1/2 109 [250 − 215 (wt pct P)0.17]−3, where N¯v is in mm−3, T˙ is in K/s, and f is volume fraction of primary silicon. Increased P addition reduces the eutectic temperature, while increased Sr appears to generate a minimum in eutectic temperature at about 100 ppmw Sr.
Original languageEnglish
Pages (from-to)1710–1715
Number of pages6
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume40
DOIs
Publication statusPublished - 14 May 2009
Externally publishedYes

Funder

This work formed part of an MPhil/PhD program at the University of Sheffield by MF, financed by the Iranian Government.

Keywords

  • Eutectic Temperature
  • Primary Silicon
  • Sand Mold
  • Random Section
  • Arrest Temperature

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