Effect of In-Situ TiB2 particles on the microstructure of spray-formed 70Si-Al alloy

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Abstract

novel reactive technique has been employed to fabricate 2.0 mass%TiB 2/70Si-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. © 2011 The Japan Institute of Metals.

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Zhang, L., Gan, G., & Yang, B. (2011). Effect of In-Situ TiB2 particles on the microstructure of spray-formed 70Si-Al alloy. Materials Transactions, 52(8), 1646–1649. https://doi.org/10.2320/matertrans.M2011066

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