Abstract
► LCF behaviour of IMI 834 alloy was studied in bare condition and with Al 2 Ti coating, at 600 °C in air. ► At higher values of Δ ɛ t /2, coated alloy has longer fatigue life as compared to the bare alloy. ► The above phenomenon appears to be due to load shifting to the coat. ► At lower values of Δ ɛ t /2, coating seems to have no effect on fatigue life. ► Coating adheres well and offers resistance to cyclic plastic deformation and hence is beneficial. The low cycle fatigue behaviour of titanium alloy IMI 834 was comparatively studied in bare condition and with titanium aluminide coating, at 600 °C in air, for compressor disc of aero engines. At higher values of total strain amplitudes (Δ ɛ t /2), coated alloy has longer fatigue life as compared to the bare alloy which appears to be due to load shifting to the coat, but at lower values of Δ ɛ t /2, coating seems to have no effect on fatigue life. Coating adheres well to the substrate and offers resistance to cyclic plastic deformation and hence is beneficial.
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