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Low cycle fatigue of cast gamma-TiAl based alloys at high temperature

SYSNO ASEP	0354105
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Low cycle fatigue of cast gamma-TiAl based alloys at high temperature
Author(s)	Petrenec, Martin (UFM-A) Šmíd, Miroslav (UFM-A)_{RID, ORCID} Kruml, Tomáš (UFM-A)_{RID, ORCID} Obrtlík, Karel (UFM-A)_{RID, ORCID} Polák, Jaroslav (UFM-A)_{RID, ORCID}
Source Title	Key Engineering Materials - ISSN 1013-9826 Roč. 452-453, - (2011), s. 421-424
Number of pages	4 s.
Language	eng - English
Country	CH - Switzerland
Keywords	low cycle fatigue ; lamellar TiAl alloys ; high temperature ; PSMs ; fracture surface
Subject RIV	JL - Materials Fatigue, Friction Mechanics
R&D Projects	GA106/07/0762 GA ČR - Czech Science Foundation (CSF)
	GA106/08/1631 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z20410507 - UFM-A (2005-2011)
UT WOS	000287421700106
DOI	10.4028/www.scientific.net/KEM.452-453.421
Annotation	The low-cycle fatigue properties of cast nearly lamellar TiAl alloys with diverse Nb content at room temperature and 750°C were compared. Monotonic tensile curves,cyclic stress-strain curves and combined fatigue life curves were obtained at both temperatures. After cyclic straining the surface relief and the fracture surfaces were observed using scanning electron microscopy. The increase in Nb content significantly improves tensile properties and CSSCs at both temperatures.The combined fatigue life curves especially at 750°C are shifted to higher fatigue lives. The effect o Nb content on the tensile and cyclic strength is discussed in relation to the thickness of the lamellae. Persistent slip markings formed along interlamellar interfaces were predominant locations for fatigue cracks. At both temperatures and materials showed similar crack initiation and propagation behavior. The cracks initiated at surface or in sub-surface region creating smooth flat areas corresponding to the persistent slip bands.
Workplace	Institute of Physics of Materials
Contact	Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
Year of Publishing	2011

Number of the records: 1