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Microstructural evolution in as-cast hypereutectic Al-Si alloys with different La additions

  • Hongkun Yi , Di Zhang EMAIL logo , T. Sakata and H. Mori
Published/Copyright: February 15, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 93 Issue 12

Abstract

The microstructure of as-cast hypereutectic Al-(17 or 25) Si-xLa (x - 0, 0.4, 1, 3, 6 wt.%) alloys and the effect of La on the Si phase have been investigated. The microstructure was examined using optical and electron microscopy. The modification effects of La addition on the morphology and size of both the primary and the eutectic Si were observed. However, such effects are uneven and there seems no systematic change for the effectiveness of La modification with increasing La contents. The modification of La may be explained by the suppression of the growth of Si crystals through reduction of the eutectic reaction temperature or through enveloping of primary Si crystals, or additional twinning. Large particles of La-rich compounds are always observed associated with large primary Si crystals and unmodified eutectic Si crystals, while small La-rich particles are associated with small primary Si crystals and modified eutectic Si crystals. The overall concentration of La-rich compounds, formed in the Al–Si alloys containing more than 1 wt.% La, could be represented as a ternary AlSi2La2 phase, which actually contains the LaSi2 phase and an unknown ternary AlxSiyLa phase.

Keywords: Microstructural evolution; As-cast hypereutectic Al–Si alloy; La; Modification; Morphology of Si
Prof. Di Zhang State Key Laboratory of Metal Matrix Composites Shanghai Jiaotong University 1954 Huashan Road, Shanghai 200030, P. R. China Tel.: +862162933 106 Fax: +862162 822012

  1. The authors would like thank to Prof. Ch. X. Cui and Xiao Wang for the assistance of SEM experiments. We also gratefully acknowledge the financial support from the National 973 project (No. 1999906490) of China.

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Received: 2002-05-06
Published Online: 2022-02-15

© 2002 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Niobium bulk and grain boundary diffusion in alpha-iron
  4. Comparison of fatigue lives between grain boundaries and component single crystals of copper bicrystals
  5. Interfacial reaction between liquid Sn-20In-2.8Ag solder and Ag substrate
  6. Modelling the continuous cooling transformation diagram of engineering steels using neural networks
  7. Modelling the continuous cooling transformation diagram of engineering steels using neural networks
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  9. Self-organized criticality – a model for recrystallization?
  10. Strain softening effects in texture and microstructure of torsioned pre-deformed Al rods
  11. Microstructural evolution in as-cast hypereutectic Al-Si alloys with different La additions
  12. Wear behaviour of graphitic aluminium composite sliding under dry conditions
  13. Temperature dependence of Young’s Modulus of alumina short fiber reinforced Zn–Al MMCs produced by pressure die-casting
  14. Notifications/Mitteilungen
  15. Personal/Personelles
  16. Information
  17. Conferences/Konferenzen
https://doi.org/10.1515/ijmr-2002-0213
Keywords for this article
Microstructural evolution; As-cast hypereutectic Al–Si alloy; La; Modification; Morphology of Si

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Niobium bulk and grain boundary diffusion in alpha-iron
  4. Comparison of fatigue lives between grain boundaries and component single crystals of copper bicrystals
  5. Interfacial reaction between liquid Sn-20In-2.8Ag solder and Ag substrate
  6. Modelling the continuous cooling transformation diagram of engineering steels using neural networks
  7. Modelling the continuous cooling transformation diagram of engineering steels using neural networks
  8. Characterization of the metastable austenite in low-alloy FeCMnSi TRIP-aided steel by neutron diffraction
  9. Self-organized criticality – a model for recrystallization?
  10. Strain softening effects in texture and microstructure of torsioned pre-deformed Al rods
  11. Microstructural evolution in as-cast hypereutectic Al-Si alloys with different La additions
  12. Wear behaviour of graphitic aluminium composite sliding under dry conditions
  13. Temperature dependence of Young’s Modulus of alumina short fiber reinforced Zn–Al MMCs produced by pressure die-casting
  14. Notifications/Mitteilungen
  15. Personal/Personelles
  16. Information
  17. Conferences/Konferenzen
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