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首页> 外文期刊>Acta biomaterialia >Optimization of Cr content of metastable β-type Ti-Cr alloys with changeable Youngs modulus for spinal fixation applications
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Optimization of Cr content of metastable β-type Ti-Cr alloys with changeable Youngs modulus for spinal fixation applications

机译：杨氏模量可变的亚稳β型Ti-Cr合金在脊柱固定中的Cr含量优化

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摘要

Metallic implant rods used in spinal fixtures should have a Youngs modulus that is sufficiently low to prevent stress shielding for the patient and sufficiently high to suppress springback for the surgeon. Therefore, we propose a new concept: novel biomedical titanium alloys with a changeable Youngs modulus via deformation-induced ω phase transformation. In this study, the Cr content in the range of 10-14 mass% was optimized to produce deformation-induced ω phase transformation, resulting in a large increase in the Youngs modulus of binary Ti-Cr alloys. The springback and cytotoxicity of the optimized alloys were also examined. Ti-(10-12)Cr alloys exhibit an increase in Youngs modulus owing to deformation-induced ω phase transformation. In this case, such deformation-induced ω phase transformation occurs along with {3 3 2} β mechanical twinning, resulting in the maintenance of acceptable ductility with relatively high strength. Among the examined alloys, the lowest Youngs modulus and largest increase in Youngs modulus are obtained from the Ti-12Cr alloy. This alloy exhibits smaller springback than and comparable cytocompatibility to the biomedical Ti alloy Ti-29Nb-13Ta-4.6Zr.
机译：脊柱固定装置中使用的金属植入物棒应具有足够低的杨氏模量，以防止对患者造成应力遮挡，并具有足够高的杨氏模量，以抑制外科医生的回弹。因此，我们提出了一个新概念：通过变形诱导的ω相变，具有可改变的杨氏模量的新型生物医学钛合金。在这项研究中，Cr含量在10-14质量％的范围内进行了优化，以产生形变诱导的ω相变，从而导致二元Ti-Cr合金的杨氏模量大大增加。还检查了优化合金的回弹和细胞毒性。 Ti-（10-12）Cr合金由于变形引起的ω相变而表现出杨氏模量的增加。在这种情况下，这种由变形引起的ω相变与{3 3 2}β机械孪晶一起发生，从而以较高的强度维持了可接受的延展性。在所研究的合金中，最低的杨氏模量和最大的杨氏模量增加是从Ti-12Cr合金获得的。该合金与生物医学Ti合金Ti-29Nb-13Ta-4.6Zr相比，回弹力小，并且具有可比的细胞相容性。

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