首页|High strength and high work hardening rate in oxygen gradient Ti-15Mo alloy
High strength and high work hardening rate in oxygen gradient Ti-15Mo alloy
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The low work hardening is a prominent deficiency for high-strength titanium(Ti)alloys.The gradient de-sign of oxygen content was adopted to realize the coupling deformation of {332}<113>twinning and dis-location slip in the Ti-15Mo alloy.This oxygen gradient alloy exhibited an optimal balance of yield/tensile strength(700 and 848 MPa)and elongation(25％),with remarkable work hardening behavior.The dom-inated dislocation slip deformation and the solution strengthening of oxygen atoms in the oxygen-rich region resulted in a remarkable increase in yield strength.The successive formation of {332)<113>twins and piled-up geometrically necessary dislocations around the twin boundaries in the oxygen-free region induced remarkable back stress strengthening,maintaining the high work hardening rate,which resulted in a stable increase in strength.The twins and dislocations formed at the crack tips effectively hindered the cracking behavior,avoiding premature necking.The present study provides a novel idea for designing oxygen layer-distributed Ti alloys,which further improves the strength-ductility tradeoff.
Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology,School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300130,China
School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China
Northwest Institute for Non-Ferrous Metal Research,Xi'an 710016,China
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