... their high density (between 17 and 18.6 g/cc). Nickel, iron and copper serve as a binder matrix, which holds ... which makes tungsten heavy alloys ductile and easy to machine. Nickel-iron is the most popular additive, in a ratio of ... yacht, sailboat, submarine and other vessels by tungsten heavy alloy. --Tungsten heavy alloy ballast for aircraft, helicopter, F1 racing cars and other ...