Abstract
The as-cast dual phase Mg-9Li-3Al (LA93) alloy was designed and prepared by vacuum resistance furnace under the protection of argon atmosphere, then processed by hot extrusion. Tension and compression fatigue properties of as-extruded dual phase LA93 alloy was studied. The as-extruded LA93 alloy had a certain hardening phenomenon during axial tension and compression fatigue. The fatigue limit of the as-extruded LA93 alloy is estimated to be σ−1 = 78.15 MPa, which is 0.37 times the tensile strength. The measured fatigue life values of the samples are in line with lognormal distribution and strong linear correlation. The S-N curve can be obtained by straight-line fitting and it is lgN = −13.72lgσ + 32.63. The P-S-N equation of confidence 90% is σ = −14.35lgN + 171.65. The crack source of the alloy sprouted on the surface of the sample and radiated diffused in the shape of the fan. There was obvious fatigue stripe on the fracture surface of the fracture surface in the crack propagation area.
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