13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- Where i δγ represent shear portions in each of activated sliding systems in determinate grain while the sample receives a macroscopic deformation δε[13]. d) TD RD {100}<011> a) b) c) d) TD RD 1 2 3 4 5 6 Figure 7. Microtexture analysis by EBSD. a) SEM scanning region, b) Distribution maps of orientation, magnification of 1000X, c) Inverse pole figure and ODF, d) pole figures Fig. 8 shows the mapping of Taylor factor in front of the crack region for sample shown in Fig. 5b). It is possible to note in Fig. 8a) that mapping shows the separating generated by propagation crack occurs with grains with different Taylor factor values, indicating that the crack delamination intergranular propagate mode. The first and second grains were separated with factor Taylor value around 4.8 and 3.5, respectively. The same situation took place for 5 and 7 grains. Already the 3 and 4 grains also show Taylor factor values in the range of 3.0 and 3.6 respectively, the same has occurred with 5 and 6 grains. It notes that approximately 14% of the grains have Taylor factor values between 4.7 and 4.8 and close to 57% of the grains have Taylor factor values between 2.9 and 3.6.
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