The solubility of nitrogen and nitrides in ternary liquid iron alloys. The limits of the 'solubility product' concept

Maziar Sahba Yaghmaee, G. Kaptay

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The associated mixture model has been applied to describe equilibria in the Fe-rich corner of two ternary Fe-X-N system (with X = Al or B). It has been found that at 1873 K more than 90 % of nitrogen is complexed into AlN molecules (associates) in the Fe-Al-N system, when the molar ratio of aluminum to nitrogen is higher than 2.5. On the other hand, in the Fe-B-N system 37% of boron is complexed into BN molecules (associates) at 1823 K, when the nitrogen content of the melt is above 80 ppm, and the boron content of the melt is below 60 ppm. The phase boundaries between liquid iron and N2 gas on the one hand, and between liquid iron and solid AlN and BN phases on the other hand have been determined. The solubility of N2 gas increases with increasing concentration of aluminum and boron in the liquid iron. The concentration dependence of the solubility of AlN and BN considerably differs from that predicted by the concept of the "solubility product", due to the strong complex (AlN and BN) formation in the systems.

Original languageEnglish
Pages (from-to)491-496
Number of pages6
JournalMaterials Science Forum
Volume414-415
Publication statusPublished - 2003

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liquid alloys
Boron
iron alloys
Iron alloys
Nitrides
nitrides
boron
Nitrogen
Iron
solubility
Solubility
Aluminum
iron
nitrogen
Liquids
products
liquids
Gases
aluminum
Molecules

Keywords

  • AlN
  • Associated mixture model
  • BN
  • Fe-Al-N and Fe-B-N phase diagram
  • Nitrogen and nitrides solubility
  • Solubility product

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

The solubility of nitrogen and nitrides in ternary liquid iron alloys. The limits of the 'solubility product' concept. / Yaghmaee, Maziar Sahba; Kaptay, G.

In: Materials Science Forum, Vol. 414-415, 2003, p. 491-496.

Research output: Contribution to journalArticle

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N2 - The associated mixture model has been applied to describe equilibria in the Fe-rich corner of two ternary Fe-X-N system (with X = Al or B). It has been found that at 1873 K more than 90 % of nitrogen is complexed into AlN molecules (associates) in the Fe-Al-N system, when the molar ratio of aluminum to nitrogen is higher than 2.5. On the other hand, in the Fe-B-N system 37% of boron is complexed into BN molecules (associates) at 1823 K, when the nitrogen content of the melt is above 80 ppm, and the boron content of the melt is below 60 ppm. The phase boundaries between liquid iron and N2 gas on the one hand, and between liquid iron and solid AlN and BN phases on the other hand have been determined. The solubility of N2 gas increases with increasing concentration of aluminum and boron in the liquid iron. The concentration dependence of the solubility of AlN and BN considerably differs from that predicted by the concept of the "solubility product", due to the strong complex (AlN and BN) formation in the systems.

AB - The associated mixture model has been applied to describe equilibria in the Fe-rich corner of two ternary Fe-X-N system (with X = Al or B). It has been found that at 1873 K more than 90 % of nitrogen is complexed into AlN molecules (associates) in the Fe-Al-N system, when the molar ratio of aluminum to nitrogen is higher than 2.5. On the other hand, in the Fe-B-N system 37% of boron is complexed into BN molecules (associates) at 1823 K, when the nitrogen content of the melt is above 80 ppm, and the boron content of the melt is below 60 ppm. The phase boundaries between liquid iron and N2 gas on the one hand, and between liquid iron and solid AlN and BN phases on the other hand have been determined. The solubility of N2 gas increases with increasing concentration of aluminum and boron in the liquid iron. The concentration dependence of the solubility of AlN and BN considerably differs from that predicted by the concept of the "solubility product", due to the strong complex (AlN and BN) formation in the systems.

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