Abstract
Low cycle fatigue behavior of titanium alloy Timetal 834 has been studied at 300°C, 450°C and 600°C under fully reversed constant total strain amplitudes (Δεt/2) ranging from 0.4% to 1.2%. The alloy exhibited initial cyclic softening followed by cyclic hardening at 450°C for Δεt/2≥0.4% while at 300°C and 600°C, cyclic softening followed by cyclic stability was noticed in the cyclic stress response curves for Δεt/2>0.4%. Precipitate shearing was observed to be the micro-mechanism responsible for cyclic softening at all test temperatures. However, dislocation-dislocation and dislocation – solute interaction was observed to be the micro-mechanism responsible for cyclic hardening only at 450°C. TEM observations revealed that the severity of planar slip is found to peak at 450°C.
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