Han Mi-Kyung, Kim Jai-Youl, Hwang Moon-Jin, Song Ho-Jun, Park Yeong-Joon
Department of Dental Materials and Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju 500-757, Korea.
Materials (Basel). 2015 Sep 9;8(9):5986-6003. doi: 10.3390/ma8095287.
In this paper, the effects of Nb addition (5-20 wt %) on the microstructure, mechanical properties, corrosion behavior, and cytotoxicity of Ti-Nb alloys were investigated with the aim of understanding the relationship between phase/microstructure and various properties of Ti-xNb alloys. Phase/microstructure was analyzed using X-ray diffraction (XRD), SEM, and TEM. The results indicated that the Ti-xNb alloys (x = 10, 15, and 20 wt %) were mainly composed of α + β phases with precipitation of the isothermal ω phase. The volume percentage of the ω phase increased with increasing Nb content. We also investigated the effects of the alloying element Nb on the mechanical properties (including Vickers hardness and elastic modulus), oxidation protection ability, and corrosion behavior of Ti-xNb binary alloys. The mechanical properties and corrosion behavior of Ti-xNb alloys were found to be sensitive to Nb content. These experimental results indicated that the addition of Nb contributed to the hardening of cp-Ti and to the improvement of its oxidation resistance. Electrochemical experiments showed that the Ti-xNb alloys exhibited superior corrosion resistance to that of cp-Ti. The cytotoxicities of the Ti-xNb alloys were similar to that of pure titanium.
在本文中，研究了添加铌（5-20 wt%）对Ti-Nb合金的微观结构、力学性能、腐蚀行为和细胞毒性的影响，旨在了解Ti-xNb合金的相/微观结构与各种性能之间的关系。使用X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）分析相/微观结构。结果表明，Ti-xNb合金（x = 10、15和20 wt%）主要由α + β相组成，并伴有等温ω相析出。ω相的体积百分比随铌含量的增加而增加。我们还研究了合金元素铌对Ti-xNb二元合金力学性能（包括维氏硬度和弹性模量）、抗氧化能力和腐蚀行为的影响。发现Ti-xNb合金的力学性能和腐蚀行为对铌含量敏感。这些实验结果表明，添加铌有助于纯钛的硬化并提高其抗氧化性。电化学实验表明，Ti-xNb合金比纯钛具有更好的耐腐蚀性。Ti-xNb合金的细胞毒性与纯钛相似。
