... /cc). Nickel, iron and copper serve as a binder matrix, which holds the brittle tungsten grains together and makes the ... golf and tungsten alloy dart parts spheres, cubes, and projectile shapes 3, High-temperature die, Electroheat , brass and copper, Tooling for ... , iron and copper serve as a binder matrix, which holds the brittle tungsten grains together and which makes tungsten heavy alloys ductile ...