CuZn

CuZn refers to copper-zinc alloys, commonly known as brass. Zinc content typically ranges from about 5% to 45% by weight, with the remainder copper. Some brasses include small amounts of lead to improve machinability, and other elements such as tin or aluminum may be added for specialized properties.

CuZn alloys exhibit a broad set of properties. They offer good ductility, workability, and castability, along with relatively high electrical conductivity among non-precious alloys. Corrosion resistance is generally good in air and freshwater, but dezincification can occur in aggressive environments, especially in high-zinc brasses or in chloride-containing solutions. Thermal treatment and tempering can modify strength, hardness, and ductility.

Microstructure varies with composition. Low-to-moderate zinc brasses are usually alpha-brass, a single-phase solid solution of zinc in copper, which is highly ductile. Brasses with higher zinc content can form a two-phase alpha/beta region, increasing strength but reducing ductility. Very high zinc content (>45%) leads to beta-brass, which is harder and more brittle and less suitable for many applications.

Manufacturing and applications. CuZn alloys are produced by melting copper with zinc in appropriate proportions, and they can be cast or wrought. They are commonly annealed to improve ductility. Typical uses include decorative hardware, plumbing fittings, fasteners, electrical connectors, heat exchangers, and musical instruments. Brass also has historical use in coinage in various eras.

Overall, CuZn encompasses a family of copper-zinc brasses with varied compositions and properties suitable for a wide range of industrial and aesthetic applications.