Abstract
The present work is aimed to develop homogeneous ultrafine eutectic composites without any micrometer size second phase dispersions. Ti70.5Fe29.5 is chosen as a model eutectic system and ingots were prepared by arc melting upon addition of different amount of Sn. The effect of Sn addition to Ti70.5Fe29.5 on the interlamellar spacing, microstructure, and elastic properties has been studied. The load dependence microhardness or indentation size effect (ISE) in ultrafine lamellar eutectic has been investigated to understand the mechanism of ISE in terms of strain gradient on the evolution of geometrically necessary dislocations. Furthermore, high-resolution transmission microscopy of deformed composites has been performed in order to reveal the role of different eutectic phases during the transfer of slip across their interface.
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