Abstract
Effect of oxygen content as an important interstitial solute on the microstructure and mechanical properties of Ti-7.5Mo alloy was investigated. With increasing the oxygen content, the yielding strength, ultimate tensile strength and Young’s modulus of Ti-7.5Mo-xO (x=0, 0.2, 0.3, 0.4, 0.5) alloys increased, while the elongation showing a decreasing tendency. Solid-solution strengthening by the oxygen atoms has been addressed as the main strengthening mechanism. Ti-7.5Mo-xO (x ≤ 0.3) alloys have been regarded with an excellent combination of high yield strength (~640 MPa) and elongation (~28%), as well as low Young’s modulus (~60 GPa). The deformation microstructure of orthorhombic-α” martensite in Ti-7.5Mo alloy was also investigated by tracking a change in the microstructure of a selected area upon tensile deformation. Deformation twins induced by 5% tensile straining was identified as {112}α”-type I twins, which had not been reported before in α”martensite in β-Ti alloys.
Highlights
Novel β-Ti alloys have been developed for biomedical applications with lower modulus, better formability and non-toxic elements (i.e.Al- and V-free), such as Ti-7.5Mo [1], Ti-15Mo [2], and Ti-29Nb-13Ta-4.6Zr [3] alloys
The purpose of the present study is to investigate the effect of oxygen content on the microstructure and mechanical properties of Ti-7.5Mo alloy
The β→α" martensitic transformation may be suppressed by the high oxygen addition (~0.5 wt.%), which agrees with the previous reports [11,12]
Summary
Novel β-Ti alloys have been developed for biomedical applications with lower modulus, better formability and non-toxic elements (i.e.Al- and V-free), such as Ti-7.5Mo (wt.%) [1], Ti-15Mo (wt.%) [2], and Ti-29Nb-13Ta-4.6Zr (wt.%, TNTZ) [3] alloys. It is well established that the mechanical properties of titanium alloys are sensitive to the interstitial solutes such as oxygen, nitrogen, carbon and hydrogen [6,7]. Extensive efforts have revealed oxygen as an effective element to improve the strength of titanium alloys due to its solid-solution strengthening effect [6]. The purpose of the present study is to investigate the effect of oxygen content on the microstructure and mechanical properties of Ti-7.5Mo alloy. Few studies have analyzed deformation behaviors of α" martensite in β-Ti alloys, especially in Ti-Mo systems [8,9,10]. The aim of this study is to investigate the deformation behaviors of α" martensite in Ti-7.5Mo alloy
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
