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Fatigue life and fracture of cast gamma TiAl intermetallic alloy at room and elevated temperatures
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SYSNO ASEP 0439947 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Fatigue life and fracture of cast gamma TiAl intermetallic alloy at room and elevated temperatures Tvůrce(i) Petrenec, Martin (UFM-A)
Šmíd, Miroslav (UFM-A) RID, ORCID
Polák, Jaroslav (UFM-A) RID, ORCIDCelkový počet autorů 3 Zdroj.dok. METAL 2011 Conference Proceedings - Papers. - Ostrava : Tanger s.r.o., 2011 - ISBN 978-80-87294-24-6 Rozsah stran s. 969-974 Poč.str. 6 s. Forma vydání Nosič - C Akce METAL 2011 /20./ Datum konání 18.05.2011-20.05.2011 Místo konání Brno Země CZ - Česká republika Typ akce WRD Jazyk dok. eng - angličtina Země vyd. CZ - Česká republika Klíč. slova low cycle fatigue ; cast gamma TiAl alloy ; fracture surfaces ; PSMs ; elevated temperature Vědní obor RIV JL - Únava materiálu a lomová mechanika CEP GAP107/11/0704 GA ČR - Grantová agentura ČR CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000302746700156 Anotace The low-cycle fatigue properties, surface relief and fracture surfaces of cast TiAl alloys with 2 at.% Nb having nearly lamellar microstructure were studied at room temperature and at 750 degrees C. Cyclic stress-strain curves (CSSC) and fatigue life curves were obtained at both temperatures. The surface relief and the fracture surfaces of fractured specimens were observed using scanning electron microscopy. At room temperature, significant cyclic hardening is observed whereas at 750 degrees C cyclic response was stable. Parameters of the CSSC, the Manson-Coffin law and the Basquin law were determined. Persistent slip markings formed along interlamellar interfaces were predominant locations for fatigue cracks at both temperatures. The cracks initiated at surface or in sub-surface region led to the formation of smooth flat areas on the fracture surface corresponding to the persistent slip bands. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2015
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