Evaluation of Al-Ti-C Master Alloys as Grain Refiner for Aluminum and Its Alloys |
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| Authors: | M A Doheim A M Omran A Abdel-Gwad and G A Sayed |
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| Affiliation: | (1) Mining and Metallurgical Department, Faculty of Engineering, Assiut University, Assiut, Egypt;(2) Mining and Petroleum Department, Faculty of Engineering, Al-Azhar University, Qena, Egypt; |
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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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