Microstructural investigation of Ti-Fe-Sn ultrafine eutectic composites reveals that β-Ti primary dendrite ineutectic matrix consists of TiFe and β-Ti for Ti72Fe22Sn6 alloy. Similarly, the Ti64Fe32Sn4 alloy and Ti68Fe23Sn9alloy consists of TiFe and Ti3Sn micron-scale primary dendrites uniformly embedded in the TiFe and β-Tieutectic structure. The β-Ti dendrite was formed in Ti72Fe22Sn6 alloy, the large number of shear bands propagationand makes multiple steps on the fracture surface. The Ti3Sn dendrite in Ti68Fe23Sn9 ultrafine eutectic alloyleads slip bands which induce the work hardening that have important role in plasticity during deformation. Onthe other hand, TiFe dendrite in Ti64Fe32Sn4 alloy was presented shear bands bypass and extinction whilethe propagation of shear bands. These microstructural changes lead to different deformation behavior in primarydendrite. Therefore, it is believed that the mechanical properties of Ti-Fe-Sn alloys could improve dueto a different deformation behavior through the minute compositional tuning of Ti-Fe-Sn alloys.