Tungsten alloys are high-density (17–18.5 g/cm³) materials primarily combined with nickel, iron, or copper to improve machinability while retaining tungsten's extreme melting point and strength. Produced via powder metallurgy, these alloys are essential for radiation shielding, aerospace counterweights, high-speed cutting tools, and electrical components. Common types include W-Ni-Fe and W-Ni-Cu.