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Atomization casting is a technique to produce the semi-finished product in a single step from the raw metal. No further heat treatment is required in the product. In the ingot cast alloy, the segregation of second phase can be seen in the microstructure. Due to coarse microstructure of ingot cast alloy, the mechanical properties are not good as compared to atomization cast alloy. The confined convergent divergent nozzle is used in the atomization casting of Al–40% Si. The mechanical properties of atomized cast and ingot cast alloys are compared, and the properties of atomized cast alloys are found better than ingot cast alloys.