バナジウムフリーα＋β型チタン合金「VLTi」の特性

概要

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By virtue of their high strength and low density, α+β titanium alloys have been used for various applications, such as airplanes and consumer products. Ti-6Al-4V alloy is one of the most popular α+β titanium alloys. Ti-6Al-4V alloy contains vanadium as alloying element. However, the official quotation of vanadium is not stable, limiting their usefulness as alloying elements. We adopted iron, whose official quotation is more stable than this of vanadium, and developed Ti-6Al-1Fe alloy, VLTi. The tensile and fatigue properties of VLTi are comparable with Ti-6Al-4V. Therefore VLTi could be used for the applications substituting for Ti-6Al-4V such as consumer products and automobile components. Moreover VLTi with lower density than Ti-6Al-4V is a suitable Ti alloy for golf head.