Figure 4

EBSD data of the surface of fatigue samples survived after 5 × 10⁶ cycles: (a,c,e,g) as-forged, 100 MPa; (b,d,f,h) T4, 70 MPa; (a,b) EBSD orientation maps to the grain structure of the as-forged and T4 samples; (c,d) {0002} pole figures of the as-forged and T4 samples; (e,f) misorientation angle distributions of the as-forged and T4 samples; (g,h) {10–12} twin boundaries (i.e. 86° < 11–20> ± 5°) were labeled in red in the as-forged and T4 samples. It is to be noted that the inverse pole figures reflecting the orientation relationship between the sample surfaces and crystallographic planes of grains were inserted in images (a,b).