This study examined the mechanical properties, springback behavior from three-point bending loading–unloading tests and biocompatibility from human osteoblast cell adhesion and proliferation experiments in Ti-15Mo alloy with different microstructures. The springback ratio increased after the appearance of deformation microstructures including {332} < 113 > twins and dislocations, due to the increased bending strength and unchanged Young’s modulus. By contrast, the change in springback ratio was dependent on the competing effect of the simultaneous increase in bending strength and Young’s modulus after phase transformation, namely, the isothermal ω-phase formation. Good cell adhesion and proliferation were observed on the alloy surface, and they were not significantly affected by the deformation twins, dislocations and isothermal ω-phase. The diversity of deformation and phase transformation microstructures made it possible to control the springback behavior effectively while keeping the biocompatibility of the alloy as an implant rod used for spinal fixation devices.

本研究检测了具有不同微观结构的 Ti-15Mo 合金的机械性能、三点弯曲加载-卸载测试的回弹行为以及人类成骨细胞粘附和增殖实验的生物相容性。由于弯曲强度增加和杨氏模量不变，变形显微组织出现后回弹率增加，包括{332}<113>孪晶和位错。相比之下，回弹率的变化取决于相变后弯曲强度和杨氏模量同时增加的竞争效应，即等温ω-相形成。在合金表面观察到良好的细胞粘附和增殖，并且它们不受变形孪晶、位错和等温ω-相的显着影响。变形和相变微结构的多样性使得有效控制回弹行为成为可能，同时保持合金作为用于脊柱固定装置的植入杆的生物相容性。