| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an α+β type titanium alloy having high Young's modulus and the high balance between strength and ductibility as a raw material for golf-club face such as driver, iron. <P>SOLUTION: The titanium alloy for golf-club face is composed, by mass, of 4.7-5.5% Al, 0.5-1.4% Fe, ≤0.03% N and O of 0.25-0.34% [O]eq calculated from the formula (1) and the balance Ti with impurities, and has the high strength and the high Young's modulus. Al, O, N for solid-solution strengthening of the α-phase are added, and also, as β-stabilizing element, the inexpensive Fe is selected. Then, by suitably limiting the additional quantity of these elements, both of the high strength and the high Young's modulus satisfying the reflection coefficient limitation can be achieved without relying to cold-working reinforcement or to aging-reinforcement heat treatment, and at the same time, a breaking elongation is largely good and the high balance between strength and ductibility is shown. The formula (1) is represented [O]eq=[O]+2.77[N]. <P>COPYRIGHT: (C)2012,JPO&INPIT |
