All metals and alloys that do not contain iron are considered non-ferrous. These metals include the following:

• Precious metals—silver, platinum, and gold.
• Copper and its alloys—bronze & brass.
• Nickle
• Palladium
• Platinum
• Titanium
• Aluminum
• Tin
• Lead
• Zinc

Non-ferrous metals often hold sought-after mechanical properties which recommend iron as the metal of choice.
Alloys of both titanium and aluminum are substitutable for iron when the exchange is not cost-prohibitive.
Nickel, cobalt, and combinations of rare earth elements alloyed with other metals can emulate iron’s magnetic
qualities.
Ferrous and Non-Ferrous Metals | Metal Casting Blog (reliance-foundry.com)