Počet záznamů: 1

Influence of niobium alloying on the low cycle fatigue of cast TiAl alloys at room and high temperatures

  1. 1.
    0346327 - UFM-A 2011 RIV NL eng J - Článek v odborném periodiku
    Kruml, Tomáš - Petrenec, Martin - Obrtlík, Karel - Polák, Jaroslav - Buček, Petr
    Influence of niobium alloying on the low cycle fatigue of cast TiAl alloys at room and high temperatures.
    Procedia Engineering. Roč. 2, č. 1 (2010), s. 2297-2305 E-ISSN 1877-7058.
    [Fatigue 2010. Praha, 06.06.2010-11.06.2010]
    Grant CEP: GA ČR GA106/08/1631; GA ČR GA106/07/0762
    Výzkumný záměr: CEZ:AV0Z20410507
    Klíčová slova: Low cycle fatigue * lamellar TiAl alloy * fracture surface
    Kód oboru RIV: JL - Únava materiálu a lomová mechanika

    The low-cycle fatigue properties of TiAl alloys with 2 at.% and 7 at.% of Nb with nearly lamellar microstructure were studied at room temperature and 750 degrees C. Cyclic hardening/softening curves, cyclic stress-strain curves (CSSC) and fatigue life curves were obtained at both temperatures as well as monotonic tensile properties. Both materials show stable cyclic response at 750 degrees C. At room temperature, significant cyclic hardening characteristic for 2 at.% Nb alloy is not observed for 7 at.% Nb alloy. This difference is attributed to higher Nb content which increases the stacking fault energy and thus prevents intensive twinning. Parameters of the CSSC, the Manson-Coffin law and the Basquin law were determined. The cyclic strength of the alloy with 7 at.% Nb is substantially higher in comparison with 2 at.% Nb, probably due to lower thickness of the lamellas.
    Trvalý link: http://hdl.handle.net/11104/0187386