Aluminum based alloys have the advantage of high strength to weight ratio, and therefore they are widely used in the automotive and aerospace industries. The liquid immiscible alloys based on Al– Pb system are potential materials for bearing alloys because they possess superior performance like superior friction properties, low cost of production, high thermal conductivity and high corrosion resistance than other aluminum bearing alloys.
Processing of Al–Pb alloys by the conventional casting techniques is difficult due to liquid immiscibility in a wide range of temperature and composition; and also large density difference of the constituent phases compared to Al alloys. Early attempts to synthesize these alloys by the conventional casting routes had limited success. A slow cooling rate associated with conventional casting processes results in rapid separation of Al and Pb-rich phases.
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