13th International Conference on Fracture June 16–21, 2013, Beijing, China -3- 3. Result and discussion 3.1 Microstructure Initial microstructure of specimens is shown in Fig. 3. As annealing temperature increases, there are less small grains, and the average grain size is larger. Fig 4(a) shows average Schmid factor for twinning of all grains of each angle. In each annealing condition, Schmid factor for twinning is larger at 60° to 90° than another angle. From this tendency, it follows that twinning deformation occurs easily in 60° to 90° specimens. Fig 4(b) shows pole figure for (0002) before tensile test. The (0002) vector shapes ring seen from the RD direction. Figure 3. IPF map of (a) as-received, (b) 285°C annealed and (c) 450°C annealed specimens before tensile test Figure 4. (a) Schmid factor for twinning and (b) pole figure for (0002) before tensile test 3.2. Mechanical properties Fig. 5 shows strain-stress curve of (a) as-received specimen and (b) 450°C annealed specimen of
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