ベータ型新チタン合金Ti-22V-4Alの特性

概要

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A beta type new titanium alloy, Ti-22% V-4%Al, was developed, and was evaluated with respect to tensile properties in comparison with other commercial beta alloys such as β III, Ti-15V-3Cr-3Sn-3Al, and Ti-13V-11Cr-3Al alloys. The included processing variables were solutionizing, solutionizing and aging, cold working, and cold working and aging.The present alloy showed the lowest tensile strength of 77 and 110kgf/mm2, respectively in solutionized and cold worked (80% reduction in area) state among alloys, which means, in practice, good cold formability.Although aging to high strength level after solutionizing and especially after cold working tends to decrease the tensile ductility, the present alloy showed the best ductilities among the alloys. In terms of maximum tensile strength obtainable by aging while possessing the reduction in area of 20% or above, the newly developed Ti-22% V-4%Al beta alloy was found to have, after solutionizing and aging, tensile strength of 130kgf/mm2 by aging of 450° or 475°C×32h, and after cold working (80%) and aging 166kgf/mm2 by aging of 450°C×32h, the latter figure being the largest among the alloys.The superior ductility of the present alloy was considered to be due to the intrinsic properties of Ti-V-Al beta system.
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