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The combined effect of titanic carbide and aluminum phosphide on the refinement of primary silicon in Al-50Si alloy

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Published/Copyright: May 18, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 99 Issue 12

Abstract

Two refinement methods for Al-50Si alloy are presented in this article: one way is using a newly developed Si-20P alloy at 1573 K; another technique is using the Si-20P alloy in company with Al-TiO2-C mixture powder at 1473 K. Compared to the first method, the second one not only has better refinement effect on primary Si but also lower refinement temperature. These results are due to the combined effect of TiC and AlP on the refinement process, and the duplex TiC/AlP nucleus of primary silicon has been demonstrated using electron probe micro-analysis. Moreover, the reaction of Al-TiO2-C mixture powder with increasing temperature was investigated using differential scanning calorimetry, which shows that the TiC particles are produced at about 1473 K. AlP particles combine with the in-situ TiC particles in the melt, which is the main reason for the formation of a duplex nucleus, and the disregistry between TiC and AlP in low-index planes is also discussed.

Keywords: Al-Si alloy; Nucleus; Primary silicon; Refinement
∗ Correspondence address, Xiangfa Liu, Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, 73 Jingshi Road, Jinan 250061, P.R. China, Tel.: +86531 88392006, Fax: +86531 88395414. E-mail:

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Received: 2008-3-10
Accepted: 2008-9-17
Published Online: 2013-05-18
Published in Print: 2008-12-01

© 2008, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101779
Keywords for this article
Al-Si alloy; Nucleus; Primary silicon; Refinement

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Editorial December 2008
  5. Basic
  6. Thermodynamic description of the C-Fe-Mn system with key experiments and its practical applications
  7. A study of phase equilibria in the Al-rich part of the Al-Mn alloy system
  8. Transient dopant segregation and precipitation in yttrium-doped alumina
  9. Experimental study on gallium activity in the liquid Ga-Bi-Sn alloys using the EMF method with zirconia solid electrolyte
  10. Modeling of the hot deformation behavior of boron microalloyed steels under uniaxial hot-compression conditions
  11. A new kinetic treatment of the oxidation of β-SiAlON powder
  12. Quantification of ∊-martensite after thermocycling in Fe-(17∼25)Mn alloys
  13. The effect of pre-structure process on magnetorheological elastomer performance
  14. Applied
  15. Corrosion protective double layer hard coatings
  16. Interpretation of inorganic melts' surface properties on the basis of chemical status and structural relations
  17. Basic
  18. Achieving ultra-fine grains in AZ61 Mg alloy by friction stir processing
  19. The combined effect of titanic carbide and aluminum phosphide on the refinement of primary silicon in Al-50Si alloy
  20. Applied
  21. The role of solidification conditions on the microstructural features of AA6111 aluminum strips cast on a horizontal single belt caster
  22. Far infrared spectroscopy of Pb0.85Sn0.15Te alloy doped with Ni
  23. DGM News
  24. DGM News
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