Abstract
Addition of Si into a Fe 70Ni 15B 15 ultrafine eutectic composite has a significant influence to modulate the microstructure to bimodal eutectic structure comprising lamellar- and irregular-type eutectic by suppressing the formation of the micron-scale dendrites upon solidification. The (Fe 70Ni 15B 15) 94Si 4 bimodal eutectic composite presents considerably enhanced plasticity of ∼13% with high strength of ∼1520 MPa. The rotational motion of the spherical eutectic colony is considered to be a crucial factor to effectively dissipate shear localization thus improving the plastic deformability.
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