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Evaluation of Al-Ti-C Master Alloys as Grain Refiner for Aluminum and Its Alloys

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Abstract

Al-Ti-C master alloys have a great potential as efficient grain refiners for aluminum and its alloys. In the present work, the Al-Ti-C master alloys are synthesized via a relatively novel technique through the reaction of a compacted mixture of K2TiF6 and graphite with molten aluminum. The obtained alloys are examined using scanning electron microscopy (SEM), energy-dispersive spectroscopy, and X-ray diffraction (XRD) methods. The results indicate that the produced Al-Ti-C master alloys contain TiC and TiAl3 particles within the aluminum matrix. Also, these alloys were evaluated using the KBI test mold. The results indicate that the produced Al-Ti-C master alloy is an efficient grain refiner for pure aluminum and its alloys compared with the Al-Ti-B one. The factors affecting the grain refinement of aluminum and its alloys are studied. The proper conditions for evaluating the efficiency of the produced Al-Ti-C master alloy to obtain a minimum grain size are as follows: temperature, 993 K (720 °C); holding time, 2 minutes; and (Ti/Al) weight ratio, 0.01 pct.

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Acknowledgments

The authors thank Eng. Sayed Abdel-Wahab, Chief of the Board of Directors, Aluminium Company of Egypt, for supporting this work. Thanks also to Eng. Shaher Abdulah, Director of the Laboratories Staff, and the RandD team for their help with the experimental part of this work. We extend our appreciation to the Derivados Del fluor, S.A. Espana Company, for supplying us with potassium fluotitanate.

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Authors and Affiliations

  1. Mining and Metallurgical Department, Faculty of Engineering, Assiut University, Assiut, Egypt

    M. A. Doheim (Professor) & G. A. Sayed (Assistant Professor)

  2. Mining and Petroleum Department, Faculty of Engineering, Al-Azhar University, Qena, Egypt

    A. M. Omran (Associate Professor) & A. Abdel-Gwad (Assistant Lecturer)

Authors
  1. M. A. Doheim
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  2. A. M. Omran
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  3. A. Abdel-Gwad
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  4. G. A. Sayed
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Corresponding author

Correspondence to A. Abdel-Gwad.

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Manuscript submitted August 28, 2010.

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Doheim, M.A., Omran, A.M., Abdel-Gwad, A. et al. Evaluation of Al-Ti-C Master Alloys as Grain Refiner for Aluminum and Its Alloys. Metall Mater Trans A 42, 2862–2867 (2011). https://doi.org/10.1007/s11661-011-0689-9

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  • DOI: https://doi.org/10.1007/s11661-011-0689-9

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