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Improvement of the resistance of titanium aluminides to environmental embrittlement

: Masset, P.J.; Bleicher, F.; Bortolotto, L.; Geiger, G.; Kolitsch, A.; Langlade, C.; Paul, J.; Pelic, B.; Pyczak, F.; Rafaja, D.; Schumacher, P.; Schütze, M.; Wolf, G.; Yankov, R.A.


Gür, T.M. ; Electrochemical Society -ECS-:
High Temperature Corrosion Materials Chemistry 10 : Held during the PRiME 2012, held in Honolulu, Hawaii, from October 7 to 12, 2012
Pennington, NJ: ECS, 2013 (ECS transactions 50, 44)
ISBN: 978-1-62332-080-5 (Softcover)
ISBN: 978-1-60768-432-9 (PDF)
Symposium "High Temperature Corrosion and Materials Chemistry" <10, 2012, Honolulu/Hawaii>
Pacific Rim Meeting on Electrochemical and Solid-State Science (PRiME) <2012, Honolulu/Hawaii>
Fraunhofer UMSICHT Sulzbach-Rosenberg ()
environmental impact; materials science

Aluminum enriched coatings have been developed for titanium aluminide alloys. It has been shown that Metal Organic Chemical Vapor Deposition (MO-CVD) and Physical Vapor Deposition (PVD) processes combined with fluorination of the coating enables to reduce significantly the embrittlement of TiAl alloys through oxidation. Even after oxidation at 900 °C for 100h, the coatings exhibit suitable adhesion and 90 % of the fracture toughness and ductility of the alloy are maintained.