Journal
ACTA MATERIALIA
Volume 59, Issue 20, Pages 7574-7585Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.09.001
Keywords
Powder consolidation; Scanning and transmission electron microscopy; Titanium aluminides; Plastic deformation
Funding
- French region Midi-Pyrenees
- TUR-BOMECA (Groupe SAFRAN) company
- LIEBHERR company
- French region Aquitaine
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TiAl alloys are prepared by spark plasma sintering (SPS) using a pre-alloyed powder with the so-called G4 composition (Ti(51)Al(47-)Re(1)W(1)Si(0.2)) . SPS densifications are conducted using short and classical cycles, with various dwell temperatures. The microstructure of the products is studied by scanning and transmission electron microscopy. In particular, constituent phases, grain size, precipitates and local chemical composition are determined. A double phase gamma + alpha(2) microstructure containing B2 precipitates is found in a large range of sintering temperatures. Mechanical properties at RT and creep strength at 700 degrees C/300 MPa are measured. No significant improvement of the mechanical properties is obtained with respect to those of SPS-TiAl alloys previously sintered. A study of the deformation mechanisms and the effect of the microstructure on these mechanisms is performed. Hence, the strong effect of microstructural heterogeneities from the initial powder is demonstrated. (C) 2011 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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