Original title: Crack Resistance Characterization in TiAl Intermetallics with Enhanced Toughness
Authors: Dlouhý, Ivo ; Stratil, Luděk ; Fukutomi, H. ; Hasegawa, M.
Document type: Papers
Conference/Event: 2016 - International Workshop on New Methods of Damage and Failure Analysis of Structural Parts /7./, Yokohama (JP), 20161101
Year: 2017
Language: eng
Abstract: The paper is focused on the analysis of the role of lamellar microstructure in fracture performance of model TiAl intermetallic compound. Coarse lamellar colonies and, at the same time, fine lamellar morphology were prepared by compressive deformation at 1553 K (region of stable alpha phase in TiAl equilibrium diagram) followed by controlled cooling to 1473 K (region of alpha+gamma phase) with delay on this temperature and then cooling down. The fracture toughness was evaluated by means of chevron notch technique. In addition, because of enhanced toughness, crack resistance curves were obtained by load - unload technique of pre-racked beams, namely in two directions of crack propagation relative to lamellar structure. Extensive development of shear ligament toughening mechanism was observed in fracture surfaces leading to quite good fracture toughness thanks to the heat treatment applied.
Keywords: Crack resistance; Fracture micromechanisms; Fracture toughness; Intermetallics; Shear ligament toughening; Titanium aluminides
Host item entry: Analysis of Damage Features and Failures for Structural Materials and Parts, ISBN 978-3-0357-1127-1, ISSN 1013-9826

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0276617

Permalink: http://www.nusl.cz/ntk/nusl-373297


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