MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of In-Situ TiB2 Particles on the Microstructure of Spray-Formed 70Si-Al Alloy
Lei ZhangGuisheng GanBin Yang
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2011 Volume 52 Issue 8 Pages 1646-1649

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Abstract

A novel reactive technique has been employed to fabricate 2.0 mass%TiB2/70Si-Al composite. The growth behavior of primary Si phase in the 2.0 mass%TiB2/70Si-Al composite was investigated when the composite was heated in its semi-solid state. Both theoretical and experimental results have shown that the in-situ TiB2 particles can refine effectively the primary Si phase and restrain the Si phase growth. The coarsening rate constant of the 2.0 mass%TiB2/70Si-Al composite was calculated as 3.69×10−18 m3/s, which is less than that of 70Si-Al alloy (7.6×10−17 m3/s), suggesting that the in-situ TiB2 particles can effectively pin the grain boundaries and arrest the migration of liquid film when the composite was heated in its semi-solid state.

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© 2011 The Japan Institute of Metals and Materials
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