Fabrication of Dense Thin Sheets of Γ-TiAl by Hot Isostatic Pressing of Tape-cast Monotapes
Lavernia, E. J.
A method is described for the fabrication of dense thin sheets of γ titanium aluminide (γ-TiAl) by a powder metallurgy route involving hot isostatic pressing (HIP) of tape-cast monotapes. Gamma-TiAl powder (particle size <90 μm) was incorporated into a concentrated slurry by mixing with an organic binder in a solvent and the system was tape-cast to form sheets with a thickness of 400-600 μm. After insertion of the tape-cast sheet into a HIP can and binder removal in situ by thermal decomposition, HIP at 1100 °C under a pressure of 130 MPa produced dense sheets with a thickness of 250-400 μm. The free, dense sheets with a fine-grain microstructure were obtained by dissolution and oxidation of the HIP can. The carbon content of the fabricated sheets was 0.035 wt.%. Facile adaptation of the process to the production of γ-TiAl thin sheets with complex shapes is expected.
M. N. Rahaman et al., "Fabrication of Dense Thin Sheets of Γ-TiAl by Hot Isostatic Pressing of Tape-cast Monotapes," Materials Science and Engineering A, Elsevier, Jan 2003.
The definitive version is available at http://dx.doi.org/10.1016/S0921-5093(03)00436-2
Materials Science and Engineering
Keywords and Phrases
Titanium; Aluminide; Thin Sheets; Tape Casting; Hot Isostatic Pressing
Article - Journal
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