Journal of Materials Science

, Volume 43, Issue 9, pp 3009–3027 | Cite as

Modification of eutectic silicon in Al–Si alloys

  • Sathyapal Hegde
  • K. Narayan PrabhuEmail author


The mechanical properties of Al–Si alloys are strongly related to the size, shape and distribution of eutectic silicon present in the microstructure In order to improve mechanical properties, these alloys are generally subjected to modification melt treatment, which transforms the acicular silicon morphology to fibrous one resulting in a noticeable improvement in elongation and strength. Improper melt treatment procedures, fading and poisoning of modifiers often result in the structure which is far from the desired one. Hence it is essential to assess the effectiveness of melt treatment before pouring. A much investigated reliable thermal analysis technique is generally used for this purpose. The deviation from the standard curve in thermal analysis helps in assessing the level of refinement of the Si structure. In the present review an attempt is made to discuss various aspects of modification, including mechanism, interaction of defects and non-destructive assessment by thermal analysis.


Aluminium Silicon Alloy Eutectic Silicon Eutectic Growth Eutectic Solidification Hypereutectic Alloy 



Authors thank the Ministry of Human Resource Development (MHRD), Government of India, New Delhi for funding the project on ‘Non-destructive Microstructure Control of Al–Si Alloys’.


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© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Metallurgical & Materials EngineeringNational Institute of Technology KarnatakaSurathkalIndia

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