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On the Refinement Mechanism of Silicon in Al-Si-Cu-Zn Alloy with Addition of Bismuth

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Abstract

Obtained results of micro and nano studies reveal that bismuth refines the silicon in which the flake silicon changed to lamellar structure with reduction in twin spacing from 160 to 75 nm. Bismuth segregates towards the inter-dendritic regions and decreases the Al-Si contact angle resulting in suppression of the silicon growth causing refinement of the eutectic structure. Increased recalescence temperature and time confirmed that the refinement effect is attributed to the growth stage.

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The authors would like to thank Universiti Teknologi Malaysia for the provision of research facilities and the Ministry of Higher Education (MOHE) for financial support under the vote 00G45.

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Authors and Affiliations

  1. Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia (UTM), 81310, Johor Baharu, Malaysia

    Saeed Farahany (Postdoctoral Fellow), Ali Ourdjini (Professor), Tuty Asma Abu Bakar (Senior Lecturer) & Mohd Hasbullah Idris (Professor)

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  1. Saeed Farahany
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  2. Ali Ourdjini
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  3. Tuty Asma Abu Bakar
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  4. Mohd Hasbullah Idris
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Correspondence to Saeed Farahany.

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Manuscript submitted July 7, 2013.

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Farahany, S., Ourdjini, A., Bakar, T.A.A. et al. On the Refinement Mechanism of Silicon in Al-Si-Cu-Zn Alloy with Addition of Bismuth. Metall Mater Trans A 45, 1085–1088 (2014). https://doi.org/10.1007/s11661-013-2158-0

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  • DOI: https://doi.org/10.1007/s11661-013-2158-0

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