A particle of foreign material in a metallic matrix. The particle is usually a compound (such as an oxide,' sulphide, or silicate), but may be of any substance that is foreign to (and essentially insoluble in) the matrix. Inclusions are usually considered undesirable, although in some cases-such as in free-machining metals-manganese sulphides, phosphorus, selenium, or tellurium may be deliberately introduced to improve machinability.
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