Abstract A Ti–8Nb–2Fe-0.2O (wt.%) alloy with high strength, high elastic admissible strain (δ) and low cost was designed using d-electron theory combined with electron-to-atom ratio ( e / a ‾ ) approach. Interstitial oxygen was introduced to strengthen the matrix of the alloy. The β-solution treated alloy was mainly composed of α″ martensite with internal {111}α″ type I nano-twins. The α″ martensite with hexagonal-like crystal structure caused by interstitial oxygen showed a high strength of 1.1 GPa but limited ductility. The alloy generated equiaxed fine-grained α phase embedded by β matrix via hot rolling and subsequent annealing in α + β phase field. The obtained alloy indicated a good combination of mechanical properties with ultimate tensile strength, Young’s modulus, ductility and δ value of 1029 MPa, 74 GPa, 21% tensile elongation and 1.32%, respectively. These findings demonstrate that interstitial oxygen and martensitic nano-twins can be used to strengthen the soft α″ martensite and high elastic admissible strain can be obtained by formation of equiaxed fine-grained α phase embedded by β matrix in this Ti–8Nb–2Fe-0.2O alloy for orthopedic implant.

中文翻译：

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用于骨科植入物的高弹性容许应变 Ti-8Nb-2Fe-0.2O 合金的显微组织演变和力学性能

摘要 利用 d 电子理论结合电子原子比 (e / a ‾) 设计了一种具有高强度、高弹性容许应变 (δ) 和低成本的 Ti-8Nb-2Fe-0.2O (wt.%) 合金。 ） 方法。引入间隙氧以强化合金的基体。β-固溶处理合金主要由α″马氏体和内部{111}α″I型纳米孪晶组成。由间隙氧引起的具有六方晶结构的α″马氏体显示出1.1 GPa的高强度，但延展性有限。该合金通过热轧和随后在α+β相场中的退火生成了嵌入β基体的等轴细晶α相。所得合金的力学性能与极限拉伸强度、杨氏模量、延展性和 δ 值为 1029 MPa、74 GPa、21% 拉伸伸长率和 1.32% 的良好组合，分别。这些发现表明，间隙氧和马氏体纳米孪晶可用于强化软α″马氏体，并且通过在该 Ti-8Nb-2Fe- 基体中形成嵌入 β 基体的等轴细晶 α 相可以获得高弹性容许应变。用于骨科植入物的 0.2O 合金。