Tungsten heavy alloys(the density is up to 18.5g/cm³)are made of tungsten based with two phase composites of Ni, Fe or Cu as additions to form a ductile matrix. Tungsten heavy alloys have good machining properties, excellent radiation resistance, lower expansion coefficiency, high strength and modulus of elasticity which make it extensively used as counterweights for various fields, such as: aircraft counterweight, crankshaft balance piece, aviation&aviation W counterweight, bucking bars,oil drilling&down hole well logging casings and weights, gyro rotor, aircraft propeller etc.

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