School of Engineering, RMIT University, Melbourne, Victoria, 3001, Australia.
Advanced Material Research and Development Center, Zhejiang Industry & Trade Vocational College, Wenzhou, Zhejiang, 325003, China.
Sci Rep. 2018 Apr 10;8(1):5737. doi: 10.1038/s41598-018-24155-y.
Alloys comprised of the highly biocompatible elements titanium, niobium and zirconium have been a major focus in recent years in the field of metallic biomaterials. To contribute to the corpus of data in this field, the current paper presents results from a thorough microstructural and mechanical investigation of Ti-32Nb-6Zr subjected to a variety of ageing treatments. The presented alloy was stabilized to the higher temperature, body-centred cubic phase, showing only minimal precipitation on prolonged ageing, despite the presence of nanoscaled spinodal segregation arising from the Nb-Zr interaction. It further showed excellent mechanical properties, with tensile yield stresses as high as 820 MPa and Young's moduli as low as 53 GPa. This leads to the ratio of strength to modulus, also known as the admissible strain, reaching a maximum of 1.3% after 6 hours ageing. These results are further supported by similar measurements from nanoindentation analysis.
近年来，由高度生物相容的元素钛、铌和锆组成的合金一直是金属生物材料领域的主要研究重点。为了丰富该领域的数据资料，本论文对经过多种时效处理的 Ti-32Nb-6Zr 进行了全面的微观结构和力学研究。所研究的合金被稳定到较高温度的体心立方相，尽管存在由 Nb-Zr 相互作用引起的纳米级旋节分解，但在长时间时效后仅出现最小的析出。此外，该合金还表现出优异的力学性能，拉伸屈服应力高达 820 MPa，杨氏模量低至 53 GPa。这导致强度与模量的比值，也称为可允许应变，在 6 小时时效后达到最大值 1.3%。这些结果得到了来自纳米压痕分析的类似测量结果的支持。
