期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 396, 期 1-2, 页码 143-150出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2004.12.039
关键词
castings; scanning electron microscopy; X-ray diffraction; Al-Ti-C
Al-5Ti-0.8C and Al-5Ti-1.2C master alloys have been successfully prepared by reaction of K2TiF6 salt and graphite powder with molten Al. While the Al-5Ti-0.8C consists of some TiAl3 particles in addition to TiC particles in the Al matrix, the Al-5Ti-1.2C master alloy revealed the presence of only TiC particles. The grain refining efficiency of these two master alloys has been compared with that of the conventional Al-5Ti-1B master alloy on Al and Al-7Si alloy at different addition levels. Al-5Ti-1.2C master alloy was found to be the most efficient grain refiner for Al amongst the grain refiners studied. Even in case of Al-7Si alloy, the Al-5Ti-0.8C and Al-5Ti-1.2C master alloys performed better than conventional Al-5Ti-1B master alloy. However, the Al-5Ti-1.2C master alloy shows poor response to grain refinement in Al-7Si alloy at higher addition levels than the Al-5Ti-0.8C master alloy, indicating poisoning. (c) 2005 Elsevier B.V. All rights reserved.
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