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Phosphor bronze, is a bronze alloy that contains a mixture of copper, tin and phosphorous. This is also includes zinc and lead. Phosphor bronze alloys are primarily used for electrical products because they have superb spring qualities, high fatigue resistance, excellent formability, and high corrosion resistance.

There are three phases in the structure of Phosphor Bronze wires :

Alpha phase: A comparatively softmatrix of copper with tin in solid solution.

Delta phase: A tin rich delta phase which is hard and interspersed throughout the matrix.

A Brittle Mix: A hard constituent of copper phosphate associated with the delta constituent, which is also hard but brittle.