Titanium alloy and method for production thereof

Abstract

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, Ti.sub.100-a-b-c-d-e Al.sub.a V.sub.b Fe.sub.c Mo.sub.d O.sub.e (1) (wherein a, b, c, d, and e respectively satisfy the relations, 3.0.ltoreq.a.ltoreq.5.0, 2.1.ltoreq.b.ltoreq.3.7, 0.85.ltoreq.c.ltoreq.3.15, 0.85.ltoreq.d.ltoreq.3.15, and 0.06.ltoreq.e.ltoreq.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.degree. C.-100.degree. 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.

Dependencies are inferred from the claim text.