Abstract
The low-cycle fatigue behaviour of titanium alloy IMI 834 was comparatively studied in bare condition and with titanium aluminide (Al2Ti) coating at 600 °C in air. Results revealed that at higher values of total strain amplitudes (Δ εt/2), Al2Ti-coated IMI 834 alloy has longer fatigue life ( Nf) compared to the bare IMI 834 alloy, which appears to be due to load shifting to the coat. At lower values of Δ εt/2, Al2Ti coating on IMI 834 alloy seems to have no effect on Nf. Higher values of cyclic strength coefficient ( K′) and cyclic hardening exponent ( n′) for coated IMI 834 alloy indicate that coating offers resistance to cyclic plastic deformation at 600 °C in air, and hence it is beneficial. The coating adheres well to the substrate and is also fairly resistant to high-temperature corrosion in sea water atmosphere at 600 °C.
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