Fracture Toughness and Fracture Mechanisms of Cast A356 Aluminum Alloys

Yong Nam Kwon; Kyu Hong Lee; Sung Hak Lee

doi:10.4028/www.scientific.net/KEM.345-346.633

Paper Titles

Fracture Resistance in Multiphase Alloys
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The State-of-the-Art of Controlling Intergranular Fracture and Brittleness by Grain Boundary Engineering
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Slope Stability Analysis by Strength Reduction Elasto-Plastic FEM
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Dynamic Deformation and Fracture Behavior of Zr-Based Bulk Metallic Glasses
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Fracture Toughness and Fracture Mechanisms of Cast A356 Aluminum Alloys
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Improvement of Hardness and Wear Resistance of Steel-Based Surface Composites Fabricated by High-Energy Electron Beam Irradiation
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Wear Resistance of Plasma-Sprayed Al₂O₃-TiO₂ Nanocoatings
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Microfracture Observation of Zr-Based Bulk Metallic Glasses
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Fracture Behavior of Ceramic Matrix Composites during Monotonic and Cyclic Loadings
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Fracture Toughness and Fracture Mechanisms of Cast A356 Aluminum Alloys

Abstract:

The present study aims at investigating the effects of microstructure on fracture toughness of two A356 Al alloys. These A356 alloys were fabricated by casting processes such as rheo-casting and casting-forging, and their mechanical properties and fracture toughness were analyzed in relation with microfracture mechanisms. All the cast A356 alloys contained eutectic Si particles mainly segregated along solidification cells, and the distribution of Si particles was modified by the casting-forging process. Microfracture observation results revealed that eutectic Si particles segregated along cells were cracked first, but that Al matrix played a role in blocking crack propagation. Tensile properties and fracture toughness of the cast-forged alloys having homogeneous distribution of eutectic Si particles were superior to those of the rheo-cast alloy.