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Influence of niobium alloying on the low cycle fatigue of cast TiAl alloys at room and high temperatures
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SYSNO ASEP 0346327 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Influence of niobium alloying on the low cycle fatigue of cast TiAl alloys at room and high temperatures Author(s) Kruml, Tomáš (UFM-A) RID, ORCID
Petrenec, Martin (UFM-A)
Obrtlík, Karel (UFM-A) RID, ORCID
Polák, Jaroslav (UFM-A) RID, ORCID
Buček, Petr (UFM-A)Number of authors 5 Source Title Procedia Engineering. - Amsterdam : Elsevier BV
Roč. 2, č. 1 (2010), s. 2297-2305Number of pages 9 s. Action Fatigue 2010 Event date 06.06.2010-11.06.2010 VEvent location Praha Country CZ - Czech Republic Event type WRD Language eng - English Country NL - Netherlands Keywords Low cycle fatigue ; lamellar TiAl alloy ; fracture surface Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GA106/08/1631 GA ČR - Czech Science Foundation (CSF) GA106/07/0762 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000278762900244 Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2011
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