High density tungsten alloy is a kind of tungsten alloy, which is based on tungsten and made of nickel, iron, copper, and other elements. The tungsten content of the alloy is 85% ~ 98%, which is obtained by powder metallurgy process. The alloy was first invented in 1935 by Mclennan (J.C.Mclennan). The structure of the high density tungsten alloy is composed of spheroidization tungsten phase and nickel solid solution surrounded by tungsten phase. During the sintering process, the nickel solid solution is liquid, which makes the alloy achieve better densification. The addition of iron and copper to the tungsten alloy is to reduce the melting point of the solid solution, avoid producing a brittle phase, increase the wettability of the liquid phase and achieve a full densification effect.

Commonly used high density tungsten alloy has two big series, namely W - Ni - Cu system and W - Ni - Fe system. The alloy has the advantages of high density, high strength, good plasticity and machinability, good conductivity and thermal conductivity, good corrosion resistance, good weldability, excellent absorption capacity for various rays.