Crystallographic fatigue crack growth in titanium single crystals

► We studied crystallographic dependence of fatigue crack growth in single crystals. ► Three crack growth mechanisms were confirmed from crystallographic perspective. ► In crystal oriented for prismatic slip, slip-off mechanism occurs to form striations. ► Herringbone patterns are formed by combined slip-off mechanism of pyramidal slips. ► Basal plane separation occurs associated with twinning by loading along c-axis.