INSA Rennes, UMR CNRS 6226 SCR / Chimie-Métallurgie, 20 avenue des Buttes de Coësmes, 35708 Rennes cedex 7, France.
J Mech Behav Biomed Mater. 2012 May;9:83-90. doi: 10.1016/j.jmbbm.2012.01.017. Epub 2012 Jan 31.
In this study, the microstructure and the mechanical properties of two new biocompatible superelastic alloys, Ti-24Nb-0.5O and Ti-24Nb-0.5N (at.%), were investigated. Special attention was focused on the role of O and N addition on α(″) formation, supereleastic recovery and mechanical strength by comparison with the Ti-24Nb and Ti-26Nb (at.%) alloy compositions taken as references. Microstructures were characterized by optical microscopy, X-ray diffraction and transmission electron microscopy before and after deformation. The mechanical properties and the superelastic behavior were evaluated by conventional and cyclic tensile tests. High tensile strength, low Young's modulus, rather high superelastic recovery and excellent ductility were observed for both superelastic Ti-24Nb-0.5O and Ti-24Nb-0.5N alloys. Deformation twinning was shown to accommodate the plastic deformation in these alloys and only the {332}<113> twinning system was observed to be activated by electron backscattered diffraction analyses.
在这项研究中，研究了两种新型生物相容性超弹性合金 Ti-24Nb-0.5O 和 Ti-24Nb-0.5N（原子%）的微观结构和力学性能。特别关注了 O 和 N 添加剂对 α(″)形成、超弹性回复和机械强度的作用，通过与作为参考的 Ti-24Nb 和 Ti-26Nb（原子%）合金成分进行比较。通过变形前后的光学显微镜、X 射线衍射和透射电子显微镜对微观结构进行了表征。通过常规和循环拉伸试验评估了力学性能和超弹性行为。两种超弹性 Ti-24Nb-0.5O 和 Ti-24Nb-0.5N 合金表现出高拉伸强度、低杨氏模量、相当高的超弹性回复和优异的延展性。变形孪晶被证明可以适应这些合金的塑性变形，并且仅通过电子背散射衍射分析观察到 {332}<113> 孪生系统被激活。
