Microstructure and Mechanical Properties of Nanostructured Intermetallic Alloy Based on Ti2AlNb
Homogeneous nanocrystalline structure with the average grain size of about 300 nm was produced in Ti2AlNb-based intermetallic alloy by a thermomechanical processing which included multistep isothermal forging at temperatures below the β-transus and intermediate annealings. Nanostructured material possessed excellent mechanical properties. At room temperature, elongations up to 25% were obtained and the ultimate strength reached 1400 MPa. The alloy exhibited superplastic behavior in the temperature range of 850-1000°C. The maximum elongation of 930% and steady state flow stress σ50 of about 125 MPa were obtained at 900°C and strain rate of 4.2×10-3 s-1. The rolling temperatures of nanostructured alloy were defined from analysis of its mechanical behavior at a typical rolling strain rate of about 10-1 s-1 and intermetallic sheets with improved mechanical properties were produced.
Yuri Estrin and Hans Jürgen Maier
M.R. Shagiev and G.A. Salishchev, "Microstructure and Mechanical Properties of Nanostructured Intermetallic Alloy Based on Ti2AlNb", Materials Science Forum, Vols. 584-586, pp. 153-158, 2008