Cyclic response and fatigue life of TiAl alloys at high temperatures

0353854 - ÚFM 2011 RIV CH eng J - Journal Article
Kruml, Tomáš - Obrtlík, Karel - Petrenec, Martin - Polák, Jaroslav
Cyclic response and fatigue life of TiAl alloys at high temperatures.
Key Engineering Materials. Roč. 417 - 418, - (2010), s. 585-588. ISSN 1013-9826.
[8th International Conference on Fracture and Damage Mechanics. St. Georges Bay, 08.09.2009-10.09.2010]
R&D Projects: GA ČR GA106/07/0762; GA ČR GA106/08/1631
Institutional research plan: CEZ:AV0Z20410507
Keywords : TiAl * lamellar microstructure * low cycle fatigue * transmission electron microscopy
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Fatigue properties of the new generation of TiAl alloys with 8at.% of Nb were studied and compared with those reported in the literature for previous generation with 2at.% of Nb. The high Nb content improves substantially the fatigue life time in the Basquin representation. Nevertheless, the fracture behaviour is still rather brittle even at 750°C. TEM study of the material after the fatigue testing was performed. The dislocation activity is concentrated in the gamma phase. The properties and behaviour of individual dislocations seem to be similar as those observed in single gamma phase TiAl alloys.
Permanent Link: http://hdl.handle.net/11104/0192983