Influence of applied pressure on the elastic strain energy of Al-5.0Cu-0.4Mn alloys prepared by squeeze casting was examined by low cycle fatigue testing.The results show that the elastic strain energy density of the alloys are decreased during the cycle process

and with the increase of applied pressure

elastic strain energy density is decreased.The strain energy density of the alloy is closely related to the degree of strain amplitude.The alloy prepared under pressure exhibits a larger strain energy density at the same strain amplitude.The difference of strain energy density in low fatigue life zone is larger than that in high fatigue life zone.Meanwhile

the low cycle fatigue life is longer with a higher pressure.