Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 848, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143376
Keywords
Metastable titanium; Mechanical properties; TWIP effect; Dislocation strengthening; Work-hardening rate
Categories
Funding
- National Natural Science Foundation of China [52127808]
- National Natural Science Founda-tion of China [52125405]
- National Key R&D Program of China [2018YFA0703602]
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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.
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.
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