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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%TiB 2/70Si-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 TiB 2 particles can refine effectively the primary Si phase and restrain the Si phase growth. The coarsening rate constant of the 2.0 mass%TiB 2/70Si-Al composite was calculated as 3.69 × 10 -18 m 3/s, which is less than that of 70Si-Al alloy (7.6 × 10 -17 m 3/s), suggesting that the in-situ TiB 2 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.

Effect of <I>In-Situ</I> TiB<SUB>2</SUB> Particles on the Microstructure of Spray-Formed 70Si-Al Alloy