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Slip transfer and blocking across grain boundaries was studied in a Ti foilwith a strong rolling texture deformed in tension. Prior to deformation, theshape of the grains and the orientation of the grain boundaries were quantifiedthrough laboratory scale diffraction contrast tomography (LabDCT). Mechanicaldeformation led to the activation of <a> prismatic slip, and sliptransfer/blocking was assessed in > 300 grain boundaries by means of slip traceanalysis and electron backscatter diffraction. A categorical model was employedto accurately assess slip transfer, and the "F1 score" of various slip transfercriteria proposed in the literature was evaluated for the first time from 3Dgrain boundary information. Remarkably, for the prismatic-dominated sliptransfer in the current Ti sample, the results show that the best predictionsof slip transfer/blocking are provided by the angle \k{appa}, which is directlyrelated to the residual Burgers vector, and by the Luster-Morris parameter m'.In contrast, metrics based on the twist angle {\theta} and on the LRB criterionwere not able to predict accurately slip transfer/blocking. Thus, the extensiveanalysis of the 3D grain boundary data and the novel application of LabDCT wasable to help clarify the role of grain boundary orientation on the mechanismsof plastic deformation in polycrystals with strong prismatic-dominated slip.

Assessment of slip transfer criteria for prismatic-to-prismatic slip in pure Ti from 3D grain boundary data