Abstract
The solidification microstructure of a Ni-Ni 3 Si eutectic alloy from the Nickel-rich portion of the Ni-Si phase diagram has been investigated regarding the processing conditions and composition. In the as-solidified condition the microstructure presented a high degree of regularity and uniformity, exhibiting an orientation clearly dependent on the heat flux direction. Also, both constituent phases exhibited tendency to non-faceted growth and it is shown that the αNi phase is the first to nucleate phase in this eutectic system. Directional solidification processing at growth rate of 1.40 cm/h resulted in a highly regular polycrystalline structure. The dominant morphology was well-aligned and lamellar, without any eutectic cells or dendrites.
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