Room-temperature low-cycle fatigue behaviour of Ti-27Al-15Nb alloy |
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Authors: | P N Singh C Ramachandra B K Singh V Singh |
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Affiliation: | (1) Department of Metallurgical Engineering, Banaras Hindu University, 221 005 Varanasi, India |
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Abstract: | Low-cycle fatigue (LCF) behaviour of the alloy Ti-27Al-15Nb, in (α
2+B2) heat-treated condition was studied in total axial strain control mode at different total strain amplitudes (Δɛ
1/2) from ±0·65 to ±1·0% and room temperature. While there was little hardening of the material at the lowest strain amplitude
(Δɛ
t/2: ±0·65%), pronounced hardening was observed at the higher strain amplitudes (Δɛ
t/2⩾0·83%). The cyclic stress, at high strain amplitudes, continuously increased from the beginning till fracture of the specimens.
The LCF resistance of the material was found to be low and this was due to its poor ductility at room temperature. Dual slope
was observed in the Coffin-Manson plot, with less slope of the upper segment than that of the lower one, as observed in several
alloys. The fracture behaviour pointed to brittleness and faceted features were observed. |
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Keywords: | Titanium aluminide low-cycle fatigue cyclic hardening fatigue life dual slope C-M plot |
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