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Metals and alloys

Which correctly pairs a copper alloy with its main alloying element?

  1. ABrass and Zn (zinc)
  2. BBronze and Ni (nickel)
  3. CCupronickel and Sn (tin)
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Answer: A. Brass and Zn (zinc)

Brass is copper with zinc added. 70/30 brass (cartridge brass), with about 30% Zn, consists only of the FCC α phase and is very ductile, which suits deep drawing. 60/40 brass (Muntz metal), with about 40% Zn, contains the BCC β phase; it is stronger but less cold-workable. Bronze is copper with tin added; it has good castability and wear resistance and is used for bearings and castings. Cupronickel is copper with nickel added; it resists seawater and is used for heat-exchanger tubes and coins. The choices pairing bronze with Ni and cupronickel with Sn swap the alloying elements of bronze and cupronickel. Because brass contains zinc, in some environments dezincification, the selective leaching of zinc alone, must be watched for.

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