Some common alloys and what we use them for..

Alloy	Components	Typical uses
Alnico	Iron (50%+), aluminum (8–12%), nickel (15–25%), cobalt (5–40%), plus other metals such as copper andtitanium.	Magnets inloudspeakersand pickups in electric guitars.
Amalgam	Mercury (45–55%), plus silver,tin, copper, and zinc.	Dental fillings.
Babbitt metal ("white metal")	Tin (90%), antimony (7–15%), copper (4–10%).	Friction-reducing coating in machine bearings.
Brass	Copper (65–90%), zinc (10–35%).	Door locksand bolts, brass musical instruments,central heatingpipes.
Bronze	Copper (78–95%),tin (5–22%), plus manganese, phosphorus, aluminum, or silicon.	Decorative statues, musical instruments.
Cast iron	Iron (96–98%), carbon (2–4%), plus silicon.	Metal structures such asbridges and heavy-duty cookware.
Cupro-nickel (copper nickel)	Copper (75%), nickel (25%), plus small amounts of manganese.	Coins.
Duralumin	Aluminum (94%), copper (4.5–5%), magnesium (0.5–1.5%), manganese (0.5–1.5%).	Automobile and aircraft body parts, military equipment.
Gunmetal	Copper (80–90%),tin (3–10%), zinc (2–3%), and phosphorus.	Guns, decorative items.
Magnox	Magnesium, aluminum.	Nuclearreactors.
Nichrome	Nickel (80%),chromium (20%).	Fireworkignition devices,heating elements in electrical appliances.
Nitinol	Nickel (50–55%), titanium (45–50%).	Shape-memory alloy used in medical items, spectacle frames that spring back to shape, and temperature switches.
Pewter	Tin (80–99%) with copper, lead, and antimony.	Ornaments, used to make tableware before glassbecame more common.
Solder	Varies. Old-fashioned solders contain a mixture of tin (50-70%), lead (30-50%), copper, antimony, and other metals. Newer solders dispense with lead for health reasons. A typical modern solder has 99.25 percent tin and 0.75 percent copper.	Connecting electrical components into circuits.
Steel (general)	Iron (80–98%), carbon (0.2–2%), plus other metals such as chromium, manganese, and vanadium.	Metal structures, car and airplane parts, and many other uses.
Steel (stainless)	Iron (50%+), chromium (10–30%), plus smaller amounts of carbon, nickel, manganese, molybdenum, and other metals.	Jewelry, medical tools, tableware.
Stellite	Cobalt (67%), chromium (28%), tungsten (4%), nickel (1%).	Coating for cutting toolssuch as saw teeth, lathes, andchainsaws.
Sterling silver	Silver (92.5%), copper (7.5%).	Cutlery, jewelry, medical tools, musical instruments.
White gold (18 carat)	Gold (75%), palladium (17%), silver (4%), copper (4%)	Jewelry.
Wood's metal	Bismuth (50%), lead (26.7%), tin (13.3%), cadmium (10%).	Solder, melting element infire sprinklersystems.