(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 运用一种改进的方法制作多元扩散节Ti-Zr-Nb，并在1173 K温度下退火1800 h，水淬至室温。结合纳米压痕仪(nano-indentation)与电子探针(EPMA)，测定扩散节上每一点的成分、硬度和弹性模量，建立Ti-Zr-Nb体系成分-硬度-弹性模量数据库。结果表明，硬度与弹性模量强烈地依赖于Zr和Nb的成分变化，Ti-41Zr-10Nb具有较小的弹性模量，且硬度较大，有望在此基础上开发新型生物医用钛合金。这种高效的扩散多元节组合材料设计方法可以加快生物医用钛合金的研制、开发与应用的速度。
关键字: 生物钛合金；组合材料设计方法；扩散节；纳米压痕
（1. School of Material science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Ti-Zr-Nb system with diffusion multiple was manufactured, then annealed at 1273 K for 1800 h, and water quenched to room temperature. Combining nano-indentation and electron probe micro-analyze (EPMA), the elastic modulus, hardness as well as composition at each point of the diffusion multiple were determined. Based on the experimental data, the composition-hardness-elastic modulus database of the Ti-Zr-Nb alloys is obtained. The results show that the elastic modulus and hardness depend strongly on Zr and Nb content. Ti-41Zr-10Nb has a relative lower elastic modulus, and a relative larger hardness, which is promising candidates as metallic biomaterials for application. The high-efficiency combinatorial approach has demonstrated to be an effective tool in accelerating the metallic biomaterials research and discovery.
Key words: biomedical titanium alloy; combinatorial approach; diffusion multiple; nano-indentation
