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Fracture Toughness and Fracture Mechanisms in TiAl Based Intermetalics
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SYSNO ASEP 0321143 Document Type K - Proceedings Paper (Czech conf.) R&D Document Type Conference Paper Title Fracture Toughness and Fracture Mechanisms in TiAl Based Intermetalics Title Lomová houževnatost a mechanismy porušování intermetalika na bázi TiAl Author(s) Dlouhý, Ivo (UFM-A) RID, ORCID
Chlup, Zdeněk (UFM-A) RID, ORCID
Hadraba, Hynek (UFM-A) RID, ORCID
Kozák, Vladislav (UFM-A) RID, ORCIDSource Title New Methods of Damage and Failure Analysis of Structural Parts. - Ostrava : VŠB - TU Ostrava, 2008 - ISBN 978-80-248-1813-9
S. 235-243Number of pages 8 s. Action New Methods of Damage and Failure Analysis of Structural Parts Event date 08.09.2008-12.09.2008 VEvent location Ostrava Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords TiAl ; intermetalics ; fracture toughness ; micromechanisms of fracture ; shear ligament toughening Subject RIV JG - Metallurgy R&D Projects GA106/07/0762 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) 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 -TiAl grains was confirmed. Based on findings obtained key aspects of the effect of separate microstructural components have been discussed. Summary of toughening effects acting in this group of intermetalics has been provided. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2009
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