The effect of grain size on low-cycle fatigue behavior of Al-2024 polycrystalline alloy

Two different sets of fatigue specimens were heat treated at different times or temperatures to investigate the effect of grain size on the low-cycle fatigue behavior of Al-2024 polycrystalline alloy. Strain-controlled low-cycle fatigue testing with a strain rate of 1×10−4 s−1 was conducted at room temperature. The fatigue response of the alloy was evaluated macroscopically in terms of cyclic stress strain response and microscopically in terms …