Grain refinement response of LM25 alloy towards Al–Ti–C and Al–Ti–B grain refiners

The grain refining response of LM25 (Al–7Si–0.35Mg) alloy has been studied with the newly made Al–5Ti–0.8C and Al–5Ti–1.2C master alloys which have been successfully prepared in the laboratory by reaction of K 2TiF 6 salt and graphite powder with Al. The results have been compared with the grain ref...

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Bibliographic Details
Published in:Journal of alloys and compounds 2009-03, Vol.472 (1), p.112-120
Main Authors: Kumar, G.S. Vinod, Murty, B.S., Chakraborty, M.
Format: Article
Language:English
Subjects:
Al–Ti–B
Al–Ti–C
Applied sciences
Casting
Exact sciences and technology
Foundry engineering
Grain refinement
Intermetallics
Metals. Metallurgy
Other casting methods. Solidification
Production techniques
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Summary:The grain refining response of LM25 (Al–7Si–0.35Mg) alloy has been studied with the newly made Al–5Ti–0.8C and Al–5Ti–1.2C master alloys which have been successfully prepared in the laboratory by reaction of K 2TiF 6 salt and graphite powder with Al. The results have been compared with the grain refining efficiency of Al–3B, Al–1Ti–3B and Al–5Ti–1B master alloys on LM25 alloy at different addition levels. The results show that the grain refining efficiency of even lowest addition level (0.1 wt.%) of both Al–5Ti–0.8C and Al–5Ti–1.2C master alloys are equivalent to the 1.0 wt.% addition levels of Al–1Ti–3B and better than 1.0 wt.% of Al–3B master alloy. At higher addition levels of Al–5Ti–0.8C and Al–5Ti–1.2C master alloys exhibits fading in grain structure on longer holding due to agglomeration of TiC particles and poisoning of Si.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2008.04.095