ICF13B

13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- In the ―ending fracture zone‖, corresponding to the highest deformation values (Fig. 5d), ductile fracture micromechanisms are shown (Fig 8). Two ductile morphologies are observed in Fig. 8 (respectively indicated by arrows with letters A and B). Morphology in A is characterized by an oriented plastic deformation, while morphology in B is characterized by an unoriented deformation. a) b) Figure 7. Fracture surface: a) intergranular cleavage, b) secondary crack in presence of inclusion. Figure 8. Fracture surface in the ending zone (as Fig. 5d) Higher magnifications SEM observations (Fig. 9a and b) allow to confirm the ductile morphology of the fracture surface shown in Fig. 8. A B

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