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Response of Mg Addition on the Dendritic Structures and Mechanical Properties of Hypoeutectic Al-10Si (Wt Pct) Alloys

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Abstract

Rapidly solidified hypoeutectic Al-10Si-xMg (x = 0, 5, 10 wt pct) alloys were produced by the melt-spinning method. The phase composition was identified by X-ray diffractometry, and the microstructures of the alloys were characterized by scanning electron microscopy. The melting characteristics were studied by differential scanning calorimetry and differential thermal analysis under an Ar atmosphere. The mechanical properties of the melt-spun and conventionally solidified alloys were tested by tensile-strength and Vickers microhardness tests. The results illustrate that the cooling rate and solidification time of 89 μm thick melt-spun ribbon were estimated to be 2.97 × 107 K s−1 and 9.31 × 10−6 s, respectively. Nanoscale Si spot particles were observed growing on the surface of the dendritic α-Al matrix and the average sizes of these spots ranged from 10 to 50 nm. The improvement in the tensile properties and microhardness was related to structural refinement and the supersaturated α-Al solid solution; the nanoscale-dispersed Si spot particles made a significant improvement to the mechanical properties of the melt-spun ribbon. Detailed electrical resistivity tests of the ribbons were carried out at temperatures of 300 K to 800 K (27 °C to 527 °C).

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Acknowledgments

This work was supported by the Turkish State Planning Organization (DPT), (Grant 2010K120720), and Turkish Scientific and Technical Research Institute (TUBİTAK), (Grant 115F045), Erciyes University Research Funds, (Grant No. FBY-12-4145) and Çankırı Karatekin University Research Funds, (Grant No. FF-28015-B04).

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Authors and Affiliations

  1. Department of Physics, Faculty of Sciences, Karatekin University, 18100, Çankırı, Turkey

    Ercan Karaköse (Assistant Professor)

  2. Department of Physics, Faculty of Sciences, Erciyes University, 38039, Kayseri, Turkey

    Mehmet Yildiz (M.Sc. Student)

  3. Department of Physics, Institute of Science, Erciyes University, 38039, Kayseri, Turkey

    Mustafa Keskin (Professor)

Authors
  1. Ercan Karaköse
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  2. Mehmet Yildiz
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  3. Mustafa Keskin
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Correspondence to Ercan Karaköse.

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Manuscript submitted February 22, 2016.

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Karaköse, E., Yildiz, M. & Keskin, M. Response of Mg Addition on the Dendritic Structures and Mechanical Properties of Hypoeutectic Al-10Si (Wt Pct) Alloys. Metall Mater Trans B 47, 2468–2478 (2016). https://doi.org/10.1007/s11663-016-0678-x

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  • DOI: https://doi.org/10.1007/s11663-016-0678-x

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