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Micromechanisms and Micromechanics of Fracture of TiAl Intermetallics
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SYSNO ASEP 0326071 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Micromechanisms and Micromechanics of Fracture of TiAl Intermetallics Author(s) Dlouhý, Ivo (UFM-A) RID, ORCID
Chlup, Zdeněk (UFM-A) RID, ORCID
Hadraba, Hynek (UFM-A) RID, ORCID
Krahula, Karel (UFM-A)Source Title Metallofizika I Noveishie Tekhnologii - ISSN 1024-1809
Roč. 31, č. 1 (2009), s. 81-96Number of pages 16 s. Language eng - English Country UA - Ukraine Keywords fracture toughness ; micromechanisms of fracture ; dhear ligament toughening ; TiAl ; intermetallics Subject RIV JG - Metallurgy R&D Projects GA106/07/0762 GA ČR - Czech Science Foundation (CSF) GD106/05/H008 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000266834200005 Annotation The paper is focused on the analysis of the role of microstructure in fracture performance of TiAl intermetalics at room and elevated temperatures. Tensile properties, flexural strength and fracture toughness have been evaluated for Ti-40Al-2Cr-2Nb-1B and Ti-46Al-0,7Cr-0,1Si-7Nb-0,2Ni alloys. Positive Nb effect on fracture resistance was found; fracture toughness of the high Nb alloy was increased at contemporary increase of tensile and flexural strength. Fracture surfaces were evaluated using scanning electron microscopy showing the key role of mechanical twinning in deformation of both alloys. As a governing mechanism of the crack initiation a microcrack nucleation at boundaries between deformation twins and -TiAl grains was confirmed. Extensive development of shear ligament toughening was observed supplying quite good fracture toughness values in high Nb alloy. Based on findings obtained key aspects of the effect of separate microstructural components have been discussed. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2010
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