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Abstract

The microstructure and mechanical properties of the optimised Al–0·35Mg–7·0Si cast alloys subjected to solid solution treatment followed by aging treatment have been analysed. The results indicate that the overheating treatment temperature of optimised alloy is 508°C. The mechanical properties of alloy with 495°C ×5 h and 500°C ×4 h solid solution treatment are better than that of other experiment conditions. Tensile strength is 239–243 MPa. Hardness is ∼104 HB. Elongation is 4·4–4·8. The main precipitation phases may have Si, Al₂Cu, Al₆Cu₃Ni and Al_xCuCe phases whose morphology may be long strip, round, ellipse, flake and block. All specimens were fractured in a mixed mode fracture character consisting of a ductile and brittle manner, and the fractographs are in good agreement with the variations in fracture modes and mechanical properties of different samples.

Keywords

Casting Mechanical Microstructure Fractography

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Effect of heat treatment on Al–7Si–0·35Mg–2Cu cast alloys

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