Abstract Highly porous Ti–18Zr-12.5Nb–2Sn (at.%) scaffolds with porosities of 70%, 75% and 80% were prepared by sintering rapidly solidified alloy fibers. Superelastic behavior of alloy fiber was investigated by the dynamic mechanical analyzer (DMA). Phase identifications of alloy fiber and scaffold were studied by X-ray diffraction (XRD). Precipitates in alloy fiber were investigated by transmission electron microscope (TEM). Porous structure of alloy scaffold was observed by scanning electron microscope (SEM). Mechanical properties and the superelasticity of alloy scaffold were investigated using compressive test. The superelasticity of alloy fibers was improved after aged at 673 K for 3.6 ks due to α precipitates. The sintered scaffolds showed three-dimensional networks with fiber-fiber sintering joints. The compressive yield stress and elastic modulus of the alloy scaffolds aged at 673 K for 3.6 ks were in the range of 5.0–16.7 MPa and 0.33–1.05 GPa, respectively. These values were a close match to those for cancellous bone. The recoverable strain increased from 3.2% to 3.7% with the increase in porosity from 70% to 80% in aged Ti–Zr–Nb–Sn scaffolds when tested at human body temperature (310 K).

中文翻译：

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用于生物医学应用的具有大可恢复应变的高度多孔无镍钛基支架

摘要 通过烧结快速凝固的合金纤维制备了孔隙率分别为 70%、75% 和 80% 的高孔隙率 Ti-18Zr-12.5Nb-2Sn (at.%) 支架。采用动态力学分析仪（DMA）研究了合金纤维的超弹性行为。通过X射线衍射(XRD)研究了合金纤维和支架的相鉴定。通过透射电子显微镜（TEM）研究合金纤维中的沉淀物。通过扫描电子显微镜（SEM）观察合金支架的多孔结构。采用压缩试验研究了合金支架的力学性能和超弹性。由于α沉淀，合金纤维的超弹性在673 K时效3.6 ks后得到改善。烧结支架显示出具有纤维-纤维烧结接头的三维网络。在 673 K 下老化 3.6 ks 的合金支架的压缩屈服应力和弹性模量分别在 5.0-16.7 MPa 和 0.33-1.05 GPa 的范围内。这些值与松质骨的值非常匹配。在人体温度 (310 K) 下测试时，老化的 Ti-Zr-Nb-Sn 支架的可恢复应变从 3.2% 增加到 3.7%，孔隙率从 70% 增加到 80%。