Low-cycle Fatigue Behavior and Microscopic Morphology of Fatigue Crack Structure of Al-Cu-Ag-Fe-Mg-Zr-Er Alloy in The Aging Treatment

Abstract Al-Cu-Ag-Fe-Mg-Zr-Er alloy with different content of Er addition was prepared by using metallurgy processing. The Al-4.5%Cu-0.5%Ag-0.35%Fe-0.38%Mg-0.1%Zr-xEr phase and its refinement mechanism were studied SEM. Tensile fatigue tests performed for the in state deformation treatment condition. microstructural observations reveal that 0.2% rare earth can effectively refine grain structure alloy. It improves room temperature tensile strength, yield elongation at break. Under condition low cycle loading, Al-4.5%Cu-0.5%Ag-0.35%Fe-0.38%Mg-0.1%Zr-0.2%Er shows a cyclic strain hardening stress response curves, which mainly depends on forming complex dislocation configurations. accumulation slip bands front boundary will lead to intergranular fracture material.