Sammendrag
Joining of dissimilar metals by compound casting method has big application potentials in manufacturing of components with optimized mechanical and functional properties. However, a big challenge is that the stable oxide films at both metals forming either in the liquid state or in the solid state will significantly reduce the wettability between liquid metal and dissimilar solid metal, preventing he formation of continuous metallurgical bonds at the joining interface. In this work we have investigated the wetting properties and solidification behaviors of Al/Cu and Al/steel compound castings. The influences of surface coating, cooling rate and alloy chemistry on the interface structures and mechanical properties have been studied. It is found that a surface coating of steel and Cu by Sn can ensure the formation of high-quality metallurgical bonding of Al/steel and Al/Cu compound castings.
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