In the last decades, biomaterials have improved the life and its quality for millions around the Globe. Titanium-based biomaterials have rapidly become the gold standard for bone contact applications. Despite their successful performance, their low strength-ductility trade-offs and work-hardening rates limit their use for example for the manufacture of vascular stents. Although a high strength-ductility trade-off and a high work-hardening rate were reported for the TWIP/TRIP Ti–12Mo alloy, strengthening strategies are required to approach its strength to the ones of Co–Cr alloys, main metallic materials used to produce stents. In this study, the investigated strengthening strategy was the increase of oxygen content from 0.04 to 0.18 wt% in the Ti–12Mo alloy. The effect of this increase on its microstructure, mechanical properties and plastic deformation mechanisms was studied. Athermal ω precipitates were observed throughout with the β matrix of both solution-treated alloys. X-Ray diffraction and transmission electron microscopy suggested that the quantity of ω phase was larger in the alloy with a higher oxygen content, contrasting with the common knowledge that O suppresses ω phase precipitation. Independently of oxygen content, {332}<113> twins and stress-induced martensite (SIM) α" occurred in the deformed microstructures. Based on the electron backscatter diffraction analyses, the area fraction of SIM α" decreased by increasing oxygen content. Although elongation decreased with this oxygen content increase, Ti–12Mo-0.18O exhibited a high true uniform elongation of 25% and a true ultimate tensile strength higher than the Ti–12Mo-0.04O alloy. Hardness and yield strength also increased by increasing oxygen content, while elastic modulus did not change.

在过去的几十年中，生物材料改善了全球数百万人的生活及其质量。钛基生物材料已迅速成为骨接触应用的金标准。尽管它们具有成功的性能，但是它们低的强度-延展性折衷和加工硬化率限制了它们在例如制造血管支架中的用途。尽管据报道TWIP / TRIP Ti-12Mo合金具有高强度-延展性的折衷和较高的加工硬化率，但仍需要采取加强策略使其强度接近Co-Cr合金，Co-Cr合金是用于制造合金的主要材料。生产支架。在这项研究中，研究的强化策略是将Ti-12Mo合金中的氧含量从0.04 wt％增加到0.18 wt％。这种增加对其微观结构的影响，研究了力学性能和塑性变形机理。两种固溶处理的合金的β基体都观察到无热的ω沉淀。X射线衍射和透射电子显微镜表明，氧含量较高的合金中，ω相的含量较大，这与O抑制ω相析出的常识相反。{332} <113>孪晶和应力诱发的马氏体（SIM）α“与氧含量无关。在电子背散射衍射分析的基础上，SIMα”的面积分数随着氧含量的增加而降低。尽管伸长率随氧含量的增加而降低，但Ti–12Mo-0.18O的真实均匀伸长率高达25％，并且真正的极限拉伸强度高于Ti–12Mo-0。04O合金。硬度和屈服强度也通过增加氧含量而增加，而弹性模量没有改变。