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Effect of in-situ formation of AlP on solidification of hypereutectic Al–Si alloy

  • Shuying Chen , Lei Zhang , Xudong Yue and Guowei Chang
Published/Copyright: October 23, 2019
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 110 Issue 11

Abstract

The effects of in-situ AlP formation on the solidification process of an Al-20 %Si alloy were studied by examining the change law of the solidification microstructures after the addition of Cu–P alloy to the melt and stirring. During the early stage of stirring, the eutectic Si was clearly refined and Si mainly existed in a point-like shape. During the middle stage of stirring, the typical eutectic microstructure disappeared, and the microstructure consisted of fine primary Si uniformly distributed in the α matrix. Many AlP precipitates with sizes near the critical nucleation radius of primary Si were formed after the Cu–P alloy was dissolved in the Al-20 %Si alloy and stirred. These AlP precipitates became the nuclei of the primary and eutectic Si. The Si-poor layers around the primary Si provided the conditions necessary for the precipitation of the primary α phases when the primary Si grew. For finer primary Si, the distance between the primary Si was reduced, and lower temperature facilitated the formation of a complete α loop or continuous α phases around the primary Si. During the eutectic reaction, the ultrafine AlP caused the eutectic Si phases to nucleate alone and grow; the eutectic α phases grew based on the primary α phases, which resulted in the formation of divorced eutectic microstructures.

Keywords: Hypereutectic Al–Si alloy; P modification; Melt stirring; Solidification process; Divorced eutectic
∗Correspondence address, Professor Shuying Chen, School of Materials Science and Engineering, Liaoning University of Technology, Shiying Street, Jinzhou, 121001, P. R. China, Tel: +86-0416-4199650, Fax: +86-0416-4198809, E-mail:

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Received: 2018-04-27
Accepted: 2019-05-14
Published Online: 2019-10-23
Published in Print: 2019-11-12

© 2019, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111831
Keywords for this article
Hypereutectic Al–Si alloy; P modification; Melt stirring; Solidification process; Divorced eutectic

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Note from the Editor-in-Chief
  5. Original Contributions
  6. The softening factor cb of commercial titanium alloy wires
  7. A comparative assessment of cyclic deformation behavior of SA333 Gr-6 steel at ambient and elevated temperatures
  8. Effects of Ni and Al on the Cu-precipitation in ferritic Fe–Cu–M (M = Ni or Al) alloy
  9. Effect of manganese on the microstructure and mechanical properties of magnesium alloys
  10. Effect of heat treatment and extrusion on wear properties of AZ91-Pr alloy
  11. Effect of anodization treatment on the mechanical properties and fatigue behavior of AA2017-T4 aluminum alloy Al–Cu–Mg1
  12. Microstructural and tribological characterization of molybdenum–molybdenum carbide structures produced by spark plasma sintering
  13. Investigation of indentation and dry sliding wear behaviour of Al-12.6 wt.% Si-10 wt.% TiB2 composites produced by sequential milling and pressureless sintering
  14. Enthalpies of mixing in ternary Ce–Cu–Sb liquid alloys
  15. Effect of in-situ formation of AlP on solidification of hypereutectic Al–Si alloy
  16. Complex-shaped high speed steel with high mechanical performance fabricated by gelcasting sintering
  17. Internal electromagnetic stirring method for preparing a large-sized aluminum alloy billet
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