... grains together and makes the alloys ductile and easy to machine.Applications: 1, Radiation shield, collimator, nuclear shielding, beamstop, ... , holders for Well Logging, Racing Weights. vibration damping and dynamic balancing. Tungsten sinker bar, Tungsten bucking bar, Tungsten boring bar, ... which makes tungsten heavy alloys ductile and easy to machine. Nickel-iron is the most popular additive, in ...