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首页> 外文期刊>Materials Science and Engineering >Microstructure and lattice parameters of suction-cast Ti-Nb alloys in a wide range of Nb concentrations
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Microstructure and lattice parameters of suction-cast Ti-Nb alloys in a wide range of Nb concentrations

机译：在广泛的Nb浓度下吸入铸造Ti-Nb合金的微观结构和晶格参数

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Metastable alloys based on the Ti-Nb system are considered promising candidates to replace the biomaterials currently used in medicine. Several very promising alloys like TNTM, TNZT, etc., were recently developed by adding Zr, Ta, Mo, Fe, or other elements to the Ti-Nb system. However, only a few fundamental studies were devoted to the structural characterisation of Ti-Nb alloys in the as-cast state. In this study, we analyze the microstructure, the phase transformations, the lattice parameters, the interaction of different phases, and Young's modulus of a wide range of Ti-Nb alloys produced by suction casting. The structure of experimental samples was investigated using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and synchrotron X-ray diffraction (SXRD) analysis. The samples with a Nb content of less than 17.5 wt % consisted of α′ phase. The pure α" phase was observed only in the alloy with 17.5 wt % Nb. The alloys with an intermediate content of Nb (20-30 wt %) contained a mixture of α", β and ω＞ phases. The samples with 30-35 wt % Nb consisted of a mix of β and ω phases. The samples with 37.5 and 45 wt % Nb included two types of β phase. In addition to the regular p phase, a little detectable amount of bcc phase was observed with a larger lattice parameter named β_(minor). The mechanical properties strongly depended on the phase composition. We found that for α"-dominated alloys, there is a correlation between Young's modulus and orthorhombicity and c/a ratio of α" phase. The lowest Young's modulus (47 GPa) was observed in the alloy with 17.5 wt % Nb, which has orthorhombicity close to unity and c/a ratio close to 1.58.
机译：基于Ti-Nb系统的亚料合金被认为是有希望的候选者，以取代目前用于医学的生物材料。最近通过将Zr，Ta，Mo，Fe或其他元素添加到Ti-Nb系统，最近近几个非常有前途的合金。然而，只有少数基本研究致力于在铸造状态下对Ti-Nb合金的结构表征。在这项研究中，我们分析了微观结构，相变，晶格参数，不同阶段的相互作用，以及通过抽吸铸造产生的各种Ti-Nb合金的杨氏模量。研究了使用扫描电子显微镜（SEM），能量分散X射线光谱（EDX）和同步调节X射线衍射（SXRD）分析来研究实验样品的结构。具有小于17.5wt％的Nb含量的样品由α'相组成。仅在17.5wt％Nb的合金中观察到纯α“相。具有Nb的中间含量（20-30wt％）的合金含有α”，β和ω>相的混合物。具有30-35wt％Nb的样品由β和ω相的混合物组成。具有37.5和45wt％Nb的样品包括两种类型的β相。除了常规p阶段之外，用名为β_（次要）的较大的晶格参数观察到一点可检测量的BCC阶段。机械性能强烈依赖于相组合物。我们发现，对于α“ - 邻居合金，杨氏模量与α”相的C / A比率之间存在相关性。在合金中观察到最低的杨氏模量（47GPa），其具有17.5wt％Nb，其具有接近统一的正极性，C / A比率接近1.58。

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