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Dislocation interactions at the crack nucleation site were investigated innear-alpha titanium alloy Ti-6242Si subjected to low cycle fatigue. Cyclicplastic strain in the alloy resulted in dislocation pile-ups in the primaryalpha grains, nucleated at the boundaries between the primary alpha and thetwo-phase regions. These two phase regions provided a barrier to slip transferbetween primary alpha grains. We suggest that crack nucleation occurred nearthe basal plane of primary alpha grains by the subsurface double-ended pile-upmechanism first conceived by Tanaka and Mura. Superjogs on the basal <a>dislocations were observed near the crack nucleation location. The two phaseregions showed direct transmission of a3 dislocations between secondary alphaplates, transmitted through the beta ligaments as a[010], which then decomposeinto (a/2)<111> dislocation networks in the beta. The beta ligaments themselvesdo not appear to form an especially impenetrable barrier to slip, in agreementwith the micropillar and crystal plasticity investigations of Zhang et al.

Dislocation interactions and crack nucleation in a fatigued near-alpha titanium alloy