Highly superplastic Ti-6Al-4V sheet for superplastic forming and diffusion bonding

• Published in: Materials technology (New York, N.Y.) N.Y.), 2000-06, Vol.15 (2), p.133-135
• Main Authors: Salishchev, G A, Galeyev, R M, Valiakhmetov, O R, Safiullin, R V, Lutfullin, R Y, Senkov, O N, Froes, F H, Kaibyshev, O A
• Format: Article
• Language: English
• ISSN: 1066-7857
• DOI: 10.1080/10667857.2000.11752867

One approach to development of metals with improved behaivor is product of sheet material with very fine grain sizes. These materials have an average grain size of < 1 mu m and show enhanced physical and mechanical properties such as 2 to 3 times increased strength and improved fatigue resistance. They also show superplastic behavior at temperatures much below the temperature range typical for materials with micron-sized grains; this can lead to a decrease in processing tool costs and material saving due to reduced contamination. The low temprature superplasticity can be used for structure production by superplastic forming /diffusion bonding (SPF/DB) at much lower temperatures (600-700 deg C) as compared to that used presently (850-950 deg C). In the present program a Ti-6Al-4V sheet has been developed with a submicrocrystalline structure and isotropic properties are presented. Room temperature mechanical properties and superplastic behavior of this sheet were also investigated and are shown.