Low-cycle fatigue behavior of die-cast AS41 magnesium alloy
Abstract：In order to investigate the low-cycle fatigue and fracture behavior of die-cast AS41 magnesium alloy at room temperature,the strain-controlled fatigue experiments were performed for the die-cast AS41 alloy with as-received and solid solution treated states.The fracture surfaces of low-cycle fatigued specimens were observed and analyzed with an S-3400N scanning electron microscope.The experimental results show that the AS41 alloy exhibits the cyclic strain hardening under low-cycle loading condition.The relationship between plastic and elastic strain amplitudes as well as reversals to failure can be described by Coffin-Manson and Basquin equations,respectively.Compared with the as-received alloy,the die-cast AS41 alloy subjected to the solid solution treatment exhibits more homogeneous microstructure,more dispersive distribution of strengthening phases and longer fatigue lives at the same total strain amplitudes.In addition,the observation on the morphology of fracture surfaces reveals that for the AS41 alloy with two processing states,the fatigue cracks initiate transgranularly on the surface of fatigue specimens and propagate in a transgranular mode.
Keywords：magnesium alloydie castingsolid solution treatmentmicrostructurelow-cycle fatiguecyclic stress responsefatigue lifefatigue fracture
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)