Fig. 10From: High cycle fatigue and fatigue crack propagation behaviors of β-annealed Ti-6Al-4V alloyThe crack paths of β-annealed Ti64 specimen, FCP tested at an R ratio of 0.1 and documented at (a) ΔKth regime, (b) the ΔK of 20 MPa√m and (c) the ΔK of 40 MPa√m by using an optical microscope. For comparison, (d) the crack path of mill-annealed Ti64 specimen examined by using an SEM at ΔKth regime is also includedBack to article page