MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Influence of Sr and Mn Additions on Intermetallic Compound Morphologies in Al-Si-Cu-Fe Cast Alloys
Peyman AshtariHiroyasu TezukaTatsuo Sato
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2003 Volume 44 Issue 12 Pages 2611-2616

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Abstract

The influence of Sr or Sr and Mn combined additions on the Fe-containing intermetallic compounds in Al-Si-Cu-Fe cast alloys has been investigated using Al-6.5%Si-3.5%Cu-1.0%Fe and Al-6.5%Si-3.5%Cu-1.0%Fe-0.3%Mn alloys (in mass%) with a similar composition to the 319 aluminum alloy. The results show that Sr successfully modifies the large, highly branched β-needle-like phase (β: Al5FeSi) into the individual, less-branched and finer one. The combined addition of Mn and Sr results in modification of the needle-like β-phase as well as promotion of Chinese script and sludge morphology formation. The mechanism of the above morphological changes has been discussed in accordance with the mechanism of nucleation and growth of the β-needle-like phase during solidification.

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© 2003 The Japan Institute of Light Metals
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