Abstract Highly porous Ti-40Zr-8Nb-2Sn (at.%) shape memory alloy scaffolds were prepared by fiber metallurgy using rapidly solidified alloy fibers for the application of cancellous bone replacement. The phase constituents of alloy fibers and scaffolds were investigated by means of X-ray diffraction (XRD), superelastic behavior of alloy fibers was investigated by means of the dynamic mechanical analyzer (DMA), microstructures and mechanical properties of scaffolds were investigated by means of scanning electron microscopy (SEM) and compressive test, respectively. As-spun alloy fibers consisted of only β phase at room temperature. Clear superelastic behavior was observed in the as-spun alloy fibers at temperatures between 153 K and 298 K. The scaffolds showed three-dimensional networks with fiber-fiber bonds, whose porosity and pore size was about 80% and larger than 100 μm, respectively. The compressive yield stress and elastic modulus of the scaffold annealed at 973 K for 1.8 ks were about 4.0 MPa and 0.3 GPa, respectively, similar to those of cancellous bone. Recoverable strain in the scaffold was improved from 2.8% to 4.0% after annealed at 973 K due to the absence of α phase formed in the as-sintered scaffold. Stable cyclic superelastic behavior was observed in the annealed scaffolds at room temperature.

中文翻译：

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通过纤维冶金在无镍高锆钛锆基形状记忆合金支架中实现高孔隙率和大恢复应变

摘要 使用快速凝固的合金纤维，通过纤维冶金制备高多孔性 Ti-40Zr-8Nb-2Sn (at.%) 形状记忆合金支架，用于松质骨置换。通过X射线衍射(XRD)研究了合金纤维和支架的相组成，通过动态力学分析仪(DMA)研究了合金纤维的超弹性行为，通过动态力学分析仪(DMA)研究了合金纤维的微观结构和力学性能。分别进行扫描电子显微镜 (SEM) 和压缩测试。初纺合金纤维在室温下仅由 β 相组成。在 153 K 和 298 K 之间的温度下，在初纺合金纤维中观察到明显的超弹性行为。支架显示出具有纤维-纤维键的三维网络，其孔隙率和孔径分别约为 80% 和大于 100 μm。支架在 973 K 下退火 1.8 ks 的压缩屈服应力和弹性模量分别约为 4.0 MPa 和 0.3 GPa，与松质骨相似。由于在烧结后的支架中没有形成 α 相，在 973 K 下退火后，支架中的可恢复应变从 2.8% 提高到 4.0%。在室温下在退火的支架中观察到稳定的循环超弹性行为。由于在烧结后的支架中没有形成 α 相，因此在 973 K 下退火后为 0%。在室温下在退火的支架中观察到稳定的循环超弹性行为。由于在烧结后的支架中没有形成 α 相，因此在 973 K 下退火后为 0%。在室温下在退火的支架中观察到稳定的循环超弹性行为。