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Role of cerium, lanthanum, and strontium additions in an Al – Si – Mg (A356) alloy

  • Ahmed M. Nabawy , Agnes M. Samuel , Saleh A. Alkahtani , Khaled A. Abuhasel and Fawzy H. Samuel
Published/Copyright: April 30, 2016
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 107 Issue 5

Abstract

The effects of individual and combined additions of cerium (Ce), lanthanum (La), and strontium (Sr) on the eutectic modification and solidification characteristics of an Al – Si – Mg (A356) aluminum alloy were investigated using optical microscopy and thermal analysis techniques. Addition of Ce, La, and Sr resulted in different depression levels of the eutectic nucleation temperature and eutectic growth undercooling, generating modified eutectic structures exhibiting different levels of modification. Microstructural results showed that the best modification levels using individual additions were achieved by Sr which produced a fine fibrous eutectic structure, followed by La, which produced a refined lamellar structure, with Ce providing the lowest level of modification. On the other hand, a combined addition of Ce and Sr provided the highest modification level, with the production of a very fine fibrous eutectic silicon structure. In general, the addition of Sr helped to further increase the refinement obtained in the alloys containing La or Ce + La additions. In the latter alloy, the main intermetallic phases observed were La(Al,Si)2 and Al20(La,Ce)Ti2Si. The improved modification levels were found to be proportional to the depression in the eutectic nucleation temperature and the eutectic growth undercooling. A high cooling rate also improved the modification level by at least one level.

Keywords: Cerium; Lanthanum; Strontium; Modification; Al – Si – Mg (A356) alloy
*Correspondence address, Prof. F.H. Samuel, Département des Sciences appliquées, Université du Québec à Chicoutimi, 555, Boulevard de l'Université, Chicoutimi (QC) G7H 2B1, Canada. Tel.: +1418-545-5406, Fax: +1418-545-5012, E-mail:

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Received: 2015-03-23
Accepted: 2015-12-14
Published Online: 2016-04-30
Published in Print: 2016-05-13

© 2016, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111360
Keywords for this article
Cerium; Lanthanum; Strontium; Modification; Al – Si – Mg (A356) alloy

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Microstructural evolution and creep of Fe–Al–Ta alloys
  5. Creep behaviour characterisation of a ferritic steel alloy based on the modified theta-projection data at an elevated temperature
  6. Facile fabrication, microstructure, and corrosion resistance of high-strength, high-hardness pure bulk aluminum
  7. A method for improving the mechanical properties of a hypereutectic Al–Si alloy by introducing the α-Al phase
  8. Experimental investigation by atomic force microscopy on mechanical and tribological properties of thin films
  9. Influence of ceramic B4C particulate addition on tensile behavior of 6061 aluminum matrix
  10. Role of cerium, lanthanum, and strontium additions in an Al – Si – Mg (A356) alloy
  11. Structural and mechanical study on Mg–xLM (x = 0–5 wt.%, LM = Sn, Ga) alloys
  12. Weibull distribution application on temperature dependence of polyurethane storage modulus
  13. Hierarchical bismuth phosphate microspheres with high photocatalytic performance
  14. Influence of calcination temperature on sol–gel synthesized single-phase bismuth titanate for high dielectric capacitor applications
  15. People
  16. Prof. Dr. Wolfgang Bleck on the occasion of his 65th birthday
  17. DGM News
  18. DGM News
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