Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 30, Issue 15, Pages 1905-1910Publisher
MANEY PUBLISHING
DOI: 10.1179/1743284714Y.0000000510
Keywords
Titanium aluminide; TiAl; Fatigue crack propagation threshold; Lamellar microstructure; Orientation
Funding
- EPSRC [DHPA GAS0206)]
- EPSRC [EP/H500375/1, EP/H500367/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H500367/1, EP/H500375/1] Funding Source: researchfish
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Cast Ti46Al8Nb with coarse lamellar microstructures was subject to fatigue crack propagation test at 650 degrees C with R=0.1. The notch region of each testpiece contains one or one dominant lamellar colony. A strong dependence of fatigue crack propagation threshold on lamellar orientation was found and the lamellar colonies with their interfaces parallel to the stress axis have the highest threshold and those 40-65 degrees off the stress axis have the lowest threshold. It is elucidated that slip or twinning parallel to lamellar interface may interact with cross-lamella slip or twinning to help open up microcracks in front of the main crack.
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