EFFECTS OF PROCESSING PARAMETERS ON ALUMINIDE MORPHOLOGY IN ALUMINUM GRAIN REFINING MASTER ALLOYS

被引：39
作者：
LEE, MS
TERRY, BS
机构：
[1] Department of Materials, Imperial College of Science, Technology and Medicine, London
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 1991年 / 7卷 / 07期
关键词：
D O I：
10.1179/mst.1991.7.7.608
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An investigation has been made of the effects of processing parameters on the microstructure of Al-Ti and Al-Zr alloys produced by the reduction of potassium fluorotitanate and potassium fluorozirconate by aluminium. Blocky aluminides (TiAl3 and ZrAl3 respectively) are produced when the reduction is performed in the liquid + solid phase region and flaky aluminides are produced when it is performed in the liquid phase region. The use of Na2TiF6 rather than K2TiF6 has no apparent effect on the alloy structure. The microstructure and the size of aluminide blocks or flakes produced are further influenced by the subsequent cooling rate experienced by the alloy. Post-fabrication heat treatment of Al-5Ti-0.2B (wt-%) alloys (produced by combined reduction of potassium fluorotitanate and potassium fluoroborate by aluminium) causes boride particles to precipitate on the aluminide surfaces. These borides grow in size and decrease in number with heat treatment time.
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页码：608 / 612
页数：5
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