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Slip intermittency and stress oscillations in titanium alloy Ti-7Al-O thatwere observed using in-situ far-field high energy X-ray diffraction microscopy(ff-HEDM) are investigated using a discrete dislocation plasticity (DDP) model.The mechanistic foundation of slip intermittency and stress oscillations areshown to be dislocation escape from obstacles during stress holds, governed bya thermal activation constitutive law. The stress drop events due to <a>-basalslip are larger in magnitude than those along <a>-prism, which is a consequenceof their differing rate sensitivities, previously found from micropillartesting. It is suggested that interstitial oxygen suppresses stressoscillations by inhibiting the thermal activation process. Understanding ofthese mechanisms is of benefit to the design and safety assessment of jetengine titanium alloys subjected to dwell fatigue.

Slip intermittency and dwell fatigue in titanium alloys: a discrete dislocation plasticity analysis