Abstract
We designed the composition of alloy with Ti-8Nb-0.5O (at. %) and fabricated in high vacuum arc-melting furnace. This work was focused on the effect of thermomechanical treatment on microstructure and mechanical properties. Transmission Electron Microscope (TEM), Scanning Electron Microscope (SEM), X-ray Diffraction analysis (XRD), Micro Vickers Hardness Tests and Tensile Tests were utilized to characterize the alloys. The annealing temperature has a significant effect on the microstructure and mechanical properties of TiNbO alloy. When the alloy was annealed at 300℃, 400℃ or at hot-rolled state, there were just α and β phases in the alloy. When the alloy was annealed at 500℃, 600℃, the alloy recrystallized and harmful ω phase appeared, which increased the modulus and strength of the alloy greatly. When the alloy is annealed at 700℃, the alloy recrystallized completely without ω phase. When we accelerated the cooling rate after annealed, the martensitic transformation appeared, which restrained the appearance of ω phase and reduced the modulus.
Highlights
Titanium alloys have attracted more and more attention and have been widely used in various medical implant materials due to their excellent mechanical, corrosion resistance and enhanced biocompatibility especially low Young’s modulus[1,2,3]
The modulus is important for implant materials which may cause stress shielding effect, a phenomenon where reabsorption of natural bone and implant loosening arises because of the mismatch in elastic modulus between natural bone and hard tissue implant[4]
Widely used biomedical titanium-based materials still have higher elastic modulus compared with human bones (1030 GPa) [5]
Summary
Titanium alloys have attracted more and more attention and have been widely used in various medical implant materials due to their excellent mechanical, corrosion resistance and enhanced biocompatibility especially low Young’s modulus[1,2,3]. Oxygen, which is regarded as an interstitial element, has a significant solid solution strengthening effect and keeps its Young’s modulus relatively low [9,10,11]. It was reported by Kim [12] that the fracture stress of solution treated specimen increased with increasing oxygen content. Some rolled specimens were annealed at 600 °C, followed by water quenching, to analyze the effect of cooling rate. TEM specimens were prepared by a conventional twin-jet electro-polishing technique with a solution of hydrofluoric acid/sulfuric acid/methanol at 2:5:93 by volume under 30V at about 233 K
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