PRODUCTION OF HIGH-STRENGTH TI ALLOY MEMBER

摘要

PURPOSE:To develop a high-strength Ti alloy member by subjecting the Ti alloy formed by adding a specific ratio of Mo to a Ti-Al-V alloy which is heretofore generally used to plastic working under specific conditions, and subjecting the alloy further to an aging treatment after cooling. CONSTITUTION:Mo is further added at 0.5-8wt% to the Ti alloy as a structural member for aircraft which contains 2-5wt% Al and 5-12wt% V and is heretofore used generally as the high-strength Ti alloy. The Ti alloy stock is plastically worked to the prescribed temp. in a 650-850 deg.C temp. range and is then cooled with air or forcibly cooled with gas with substantially no dimensional changes and residual strains, by which the two-phase structure of alpha+beta enriched with the beta phase is obtd. Such alloy is subjected to the aging treatment at the prescribed temp. in a 400-600 deg.C range. The high-strength Ti alloy member is produced with simple process without subjecting to a soln. heat treatment.