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

被引：0
|
作者：
M. A. Doheim
A. M. Omran
A. Abdel-Gwad
G. A. Sayed
机构：
[1] Assiut University,Mining and Metallurgical Department, Faculty of Engineering
[2] Al-Azhar University,Mining and Petroleum Department, Faculty of Engineering
来源：
Metallurgical and Materials Transactions A | 2011年 / 42卷
关键词：
Pure Aluminum; Master Alloy; Al3Ti; Molten Aluminum; Refining Efficiency;
D O I：
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学科分类号：
摘要：
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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页码：2862 / 2867
页数：5
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