Title of article :
Effect of long-term ageing on microstructure stability and lattice parameters of coexisting phases in intermetallic Ti–46Al–8Ta alloy
Author/Authors :
Lapin، نويسنده , , J. and Pelachov?، نويسنده , , T. and Witusiewicz، نويسنده , , V.T. and Dobro?ka، نويسنده , , E.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Abstract :
The lamellar α2(Ti3Al) + γ(TiAl) microstructure of intermetallic Ti–46Al–8Ta (at.%) alloy is thermodynamically unstable and transforms to α2 + γ + τ type during long-term ageing at 750 °C. A new ternary τ-phase with B82 type structure (space group P63/mmc, Pearson symbol hP6) is identified by XRD analysis and its occurence is included to thermodynamic modelling of Ti–Al–Ta phase diagram by CALPHAD approach. The lattice parameters of the coexisting γ, α2 and τ phases change during ageing.
Keywords :
F. Diffraction (X-ray) , D. Microstructure , A. Titanium aluminides , based on TiAl , B. Phase identification , B. Phase diagrams
Journal title :
Intermetallics
Journal title :
Intermetallics
