Mechanical properties and deformation mechanism of a novel metastable ?-type Ti-4V-2Mo-2Fe alloy

ABS T R A C T Herein, a beta-type titanium alloy Ti-4V-2Mo-2Fe (at. %) with excellent mechanical properties was designed using the molybdenum equivalence approach combined with the Bo-Md map. Alloy design exhibited some noteworthy mechanical characteristics, including a uniform elongation of 31%, high yield strength of 736 MPa, and stable intervals with high work-hardening rates. A systematic investigates of the deformation mechanisms reveals that twinning-induced plasticity (TWIP) effects cause the formation of complex twinning networks in the alloy and increase plasticity. Both early and middle stages, the alloy's work-hardening behavior is dominated by the dy-namic Hall-Petch effect, whereas the late work-hardening behavior of the alloy is dominated by the dislocation slips. Simultaneously, a small omega phase forms during the deformation, promoting the work-hardening ability of alloys.

Automated summary

In this study, a beta-type titanium alloy with excellent mechanical properties was designed using the molybdenum equivalence approach and Bo-Md map. The alloy exhibited high uniform elongation, yield strength, and stable intervals with high work-hardening rates. The investigation of deformation mechanisms revealed the significant influence of twinning-induced plasticity effects and dislocation slips on the alloy's work-hardening behavior.