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

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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.