High yield strength bulk Ti based bimodal ultrafine eutectic composites with enhanced plasticity

• Bimodal eutectic composites (Ti0.705Fe0.295)100−xGax has been synthesized.
• Ga addition in Ti-Fe alloys leads to highest yield strength (2470 ± 10MPa).
• Eutectic structure refinement is proposed for better mechanical properties.

Ti-based bulk metallic glass (BMGs) and their bimodal composites are linked with the pronounced strain hardening after yielding but with much low value of strength. Therefore, developing Ti-based alloys with high yield strength and high plasticity is the current challenge. Here, we report the synthesis of ultra-fine grained bulk (UFG) (Ti0.705Fe0.295)100−xGax (0 ⩽ x ⩽ 2) bimodal eutectic composites with not only high strength and larger plasticity but also with high yield strength which is one of the important mechanical property for structural application. Reasonably high strength, high yield strength, strain to failure ratio, and enhanced plasticity of ∼7 ± 0.8% was observed in (Ti70.5Fe29.5)98Ga2 composite which is superior than Ti-based BMGs and bimodal composites. Modification of degree of eutectic structure refinement and volume fraction of constituent phases with the addition of Ga are the crucial factors in enhancing the mechanical properties of Ti–Fi–(Ga) composites.