| 摘要 |
A titanium alloy possessing an equiaxial two-phase ( alpha + beta ) structure having an average grain size in the range of from 1 mu m to 10 mu m is obtained by a prescribed heat treatment of a titanium alloy material having a composition represented by the following formula 1, Ti100-a-b-c-d-eAlaVbFecModOe (1) (wherein a, b, c, d, and e respectively satisfy the relations, 3.0</=a</=5.0, 2.1</=b</=3.7, 0.85</=c</=3.15, 0.85</=d</=3.15, and 0.06</=e</=0.20). The titanium alloy is formed in prescribed shape and size and finished with a mirror surface. It is produced by a method which comprises subjecting a titanium alloy material having a composition represented by the formula 1 to a solid solution treatment at a temperature in an alpha + beta range 25 DEG C.-100 DEG C. lower than the beta transformation point, quenching the solid solution, and further subjecting the quenched mass to a treatment of age hardening at a temperature not exceeding the a transformation point.
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