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A study of the Si-phase growth mechanismin thixocast (A356) alloy during hot deformation

  • M. Haghshenas , A. Zarei-Hanzaki and S. M. Fatemi-Varzaneh
Published/Copyright: March 1, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 99 Issue 2

Abstract

The microstructure in modified semi-solid thixocast (A356) alloy consists of an α-Al phase with an Al/Si eutectic structure. The silicon phase in the eutectic structure is coral-like with fine fibers. The lack of good ductility in this alloy is related to the presence of silicon fibers. Accordingly, many investigations have been recently conducted to modify the Si morphology through thermomechanical processing on this alloy. In the present work, a thixocast (A356) alloy was deformed at 450 °C, 500 °C and 540 °C through different strain rates. Consequently the silicon fibers were broken into small particles. The results indicated that the Si particles might coarsen at 540 °C when deformed by rates of 0.0005 s−1 and 0.0001 s−1.

Keywords:: Thixocast (A356); Growth; LSW; Hot deformation; Silicon
2 Correspondence address: Meysam Haghshenas, Master of Science, School of Metallurgy and Materials Science Engineering, University of Tehran, P. O. Box 11365-4563, North Karegar, Tehran, Iran, Tel.: +98 21 6111 4167, Fax: +98 21 8800 6076. E-mail: (Preferred E-mail)

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Received: 2007-01-20
Accepted: 2007-11-08
Published Online: 2013-03-01
Published in Print: 2008-02-01

© 2008, Carl Hanser Verlag, Munich

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https://doi.org/10.3139/146.101617
Keywords for this article
Thixocast (A356); Growth; LSW; Hot deformation; Silicon

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. IJMR wishes all its readers and contributors a belated Happy New Year
  5. Basic
  6. Experimental study of the phase relations in the Fe–Zn–Cr system at 600°C
  7. Thermodynamic description of the ternary Pd–Sn–Zn system
  8. The morphology of nitrided iron–chromium alloys; influence of chromium content and nitrogen supersaturation
  9. The surface tension and density of Ag–Bi–Sn alloys
  10. Density and thermal expansion of liquid binary Al–Ag and Al–Cu alloys
  11. Hardening precipitation and mechanical properties in new Mg–Mn–Y–Gd alloys
  12. On recrystallization texture formation in polycrystalline fcc alloys with low stacking fault energies
  13. A numerical study of grain size effects on the strength and elongation of Al polycrystals using strain gradient plasticity theory
  14. Applied
  15. Thermodynamic simulation of the Bayer process
  16. The anisotropy of deformation for friction stir processed Mg alloy due to the existence of onion rings
  17. A study of the Si-phase growth mechanismin thixocast (A356) alloy during hot deformation
  18. Study of hydrogen absorption of aluminum melt
  19. Modelling of work-hardening behaviour for laser welded magnesium alloy
  20. Tribological behavior of short carbon fiber or hybrid with SiCp reinforced Al alloy composites
  21. Elevated temperature compressive behavior of Nb-22Ti-16Si-7Cr-3Al-3Ta-2Hf alloy with minor Ho addition
  22. Notifications
  23. News
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