2017 | AFC ACCOMPLISHMENTS 164 mechanisms of constituent oxide elements, but enhanced diffusion rates due to the high density of dislocations formed during FSW could account for their coarsening during the short-time that the spinning pin tool advanced through the thin plate.The horizontal cracks observed on the advancing side of the SZ may have formed because of residual stresses caused by FSW and their propagation direction was consistent with the {100} delamination fracture mechanism. The tensile properties and deformation behavior of specimens fabricated from the unaffected zone (UAZ) and SZ of the thin 14YWT plates were studied using digital image correlation (DIC). With this approach, the surface of a miniature tensile specimen (SS-Mini) is painted with speckles of black and white paints for measuring localized strains along the gage during tensile testing and acquiring digital images as a function of time. Figure 1 shows stress-strain curves of four Figure 3. Strain rate maps of (a) specimen #1 from the stir zone and (b) specimen #4 from the unaffected zone.