Abstract
This study investigated the high-cycle fatigue behavior of an extruded dual-phase magnesium-lithium (Mg-Li) alloy using ultrasonic fatigue experiments and surface replica techniques. Specimens along the extrusion and transverse directions were compared. The α-Mg phase was found to significantly affect fatigue crack behaviors, with different deformation textures and microstructures in ED and TD specimens. ED specimens exhibited a stronger cylindrical texture, which impeded crack initiation within the basal plane of the α-Mg grain, resulting in higher fatigue strength than TD specimens. This study highlights the importance of microstructure and deformation texture in determining the fatigue behavior of dual-phase Mg-Li alloys.
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