Microstructure and Mechanical Properties of Nanostructured Intermetallic Alloy Based on Ti2AlNb

Abstract:

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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.

Info:

Periodical:

Materials Science Forum (Volumes 584-586)

Edited by:

Yuri Estrin and Hans Jürgen Maier

Pages:

153-158

DOI:

10.4028/www.scientific.net/MSF.584-586.153

Citation:

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

Online since:

June 2008

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$35.00

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