Development ofβ-phase Titanium Alloys with Low Young's Modulus

研究了Ti-Nb-Ta-Zr合金的弹性性能。结果发现，剪切模量c'和c44从室温冷却时，这导致在室温下的多晶体的低杨氏模量的下降。ω相的形成改变了c'和c_（44）的温度依赖性，使室温下的c'和c_（44）增加。因此，ω相的形成提高了多晶的室温杨氏模量。然而，在表现出低β相稳定性和低c'和c44的β相基质中形成ω相不会导致c'和c44的大幅增加。因此，少量的ω-相形成对于实现与高强度相容的低杨氏模量的微结构的控制是有用的。

Elastic properties of Ti-Nb-Ta-Zr alloys developed for biomedical application were investigated. It was found that shear moduli c' and c44 decrease upon cooling from room temperature, which gives rise to the low Young's modulus of polycrystals at room temperature. The formation of ω-phase changes the temperature dependence of c' and c44 and increases c' and c44 at room temperature. Therefore, the formation of ω phase increases the Young's modulus of polycrystals at room temperature. However, the formation of ω-phase in theβ-phase matrix exhibiting lowβ-phase stability and low c' and c44 does not cause a large increase of c' and c44. Thus, the small amout ofω-phase formation is useful for the control of microstructure which achieve a low Young's modulus compatible with a high strength.