Abstract
Directionally solidified Si–6wt.%TaSi2 eutectic alloy has been studied to characterize the variation of inter-rod spacing at different growth rates (V=6–200μm/s) with a constant temperature gradient (210K/cm). Statistical distributions of inter-rod spacings at each solidification rate are determined. It is confirmed that the relationship between inter-rod spacing and solidification rate obeys the Magnin–Kurz model, and the theoretical value of λa2V=5435.6μm3/s (λa is the average inter-rod spacing) approximately equals to the experimental value of λa2V1.06=5343.6μm3.06/s. For the Si–TaSi2 system, the operating parameter ϕ is a function of the solidification rate due to the transition of the TaSi2 phase from facet to nonfacet, and as the solidification rate increases the kinetic undercooling cannot be ignored.
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