Abstract
The fatigue life of a hot extruded Al-12.7Si-0.7Mg alloy under T1, T4, and T6 conditions was studied. The microstructure and tensile properties of the alloy were investigated in order to analyze the fatigue behavior. The results of the fatigue test showed that an extruded Al-12.7Si-0.7Mg alloy provided greater fatigue life compared to a cast Al-Si alloy, which was explained by the refined microstructure characterized by fine Si particles uniformly distributed in the Al matrix of fine equiaxed grains promoted by hot extrusion. The fatigue property of the alloy in T6 treatment was higher than that in the T4 and T1 conditions due to strengthening precipitation.
Highlights
Wrought Al-Si alloys for structural application have been generated by the combination of direct chill casting and plastic deformation (Yu et al, 2005)
Compared with the T1 condition, the solid solution treatment changed the size of the Si particles
The grain size of the Al matrix on the cross-section of the extruded alloy was analyzed by electron back-scattered diffraction (EBSD)
Summary
Wrought Al-Si alloys for structural application have been generated by the combination of direct chill casting and plastic deformation (Yu et al, 2005). The microstructure of the deformed Al-12.7Si0.7Mg alloy consists of fine and uniformly distributed Si particles on equiaxed Al grain boundaries. Microstructure features including eutectic silicon characteristics (i.e., size and morphology) (Casellas et al, 2005; Ammar et al, 2008; Mbuya et al, 2011), secondary dendrite arm spacing (SDAS) (Yi et al, 2004; Shaha et al, 2015), and intermetallic compounds influence the fatigue properties. A fine microstructure with smaller SDAS and cell size could increase the fatigue life (Yi et al, 2004; Shaha et al, 2015)
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