Abstract
The structure and mechanical behavior of directionally solidified Ni-Ni3Nb eutectic have been investigated. The lamellar eutectic grows with the Ni-Ni3Nb interface semicoherent and, within experimental error, parallel to close-packed planes in both phases. When the temperature is lowered, supersaturation in the nickel-rich phase is relieved mostly by precipitation. Mechanical twinning is the typical deformation mode of the Ni3Nb phase and is also observed in the nickel phase between 700∮ and 1000°. The unusually high ductility of the regular structure below 600° is related to the high strain hardening rate due to mechanical twinning of the intermetallic and the difficulty of crack propagation.
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