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Abstract

The compressive behaviour of partially remelted A356 alloys reinforced with 20 vol.-%SiC particles (Duralcan F3 A20S) is investigated. The influence of isothermal holding time in the range 2–120 min in the semisolid state before compression at a constant strain rate of 0·1 S^−l is investigated. It is observed that deformation always takes place under very low stresses, which decrease as holding time increases. Comparison is made with the unreiriforced alloy (A356) together with composites extruded after fabrication. The compressive behaviour in the semisolid state at various constant strain rates in the range 6·2 × 10⁻³–0·4 S⁻¹ is also investigated. Theflow stresses are sensitive to strain rate according to the classical power law (σ=K03B5;^m Kern, with values of m in the range 0·3–0·4. Microstructural characterisation of the specimens after partial remelting and after compression is also carried out and the correlations between the compressive behaviour and the microstructure are discussed. In particular, it is shown that the presence of the particles leads to finer, less agglomerated globules of the solid phase than in the unreiriforced alloy, which explains the high deformability of the composites.

MST/1993

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Compressive behaviour of partially remelted A356 alloys reinforced with SiC particles

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