Microstructural evolution during fatigue of ultrafine grained aluminum alloy

▶ Role of low misorientation grain boundaries (θ < 2.5°) in accommodating UFG-Al fatigue damage. ▶ Instability of high misorientation grain boundary (2.5° < θ < 15°) in UFG-Al during fatigue. ▶ OIM based assessment of microstructural changes during fatigue induced recrystallization. ▶ Fatigue life improvement in UFG-Al due to dislocation storage at second phase.