Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
J Mech Behav Biomed Mater. 2012 Oct;14:48-54. doi: 10.1016/j.jmbbm.2012.05.005. Epub 2012 May 22.
The elastic anisotropy of the Ti-15Mo-5Zr-3Al (mass%) β-Ti alloy, an ISO certified biomedical material, was investigated using its single crystal. It was revealed that the Young's modulus exhibited pronounced anisotropy. The Young's modulus was reduced to 44.4GPa along the 〈100〉 direction in the Ti-15Mo-5Zr-3Al single crystal, that is comparable to that of human cortical bones. We determined the strategy that β-Ti alloys with extremely low moduli can be developed by reducing the electron-atom (e/a) ratio in alloys, and by suppressing the formation of the ω-phase at the same time. This new knowledge must lead to the development of "single crystalline β-Ti implant materials" as hard tissue replacements for reducing the stress shielding effect.
Ti-15Mo-5Zr-3Al（质量%）β-Ti 合金是一种经过 ISO 认证的生物医学材料，其弹性各向异性已通过单晶进行了研究。结果表明，杨氏模量表现出明显的各向异性。在 Ti-15Mo-5Zr-3Al 单晶中，沿〈100〉方向的杨氏模量降低至 44.4GPa，与人皮质骨相当。我们确定了一种策略，即通过降低合金中的电子-原子（e/a）比并同时抑制ω相的形成，可以开发出具有极低模量的β-Ti 合金，这一新知识必将导致“单晶β-Ti 植入材料”的发展，作为减少应力屏蔽效应的硬组织替代品。
