Crack Resistance Characterization in TiAl Intermetallics with Enhanced Toughness
| Autor: | Makoto Hasegawa, Hiroshi Fukutomi, Ivo Dlouhý, Luděk Stratil |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Toughness Materials science Mechanical Engineering Intermetallic Fracture mechanics 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure Crack growth resistance curve 01 natural sciences Fracture toughness Mechanics of Materials 0103 physical sciences Fracture (geology) General Materials Science Lamellar structure Composite material 0210 nano-technology |
| Zdroj: | Key Engineering Materials. 741:13-18 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.741.13 |
| Popis: | 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 α phase in TiAl equilibrium diagram) followed by controlled cooling to 1473 K (region of α+g 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. |
| Databáze: | OpenAIRE |
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