About tungsten heavy alloy
Tungsten heavy alloy illustrate the advantages of microencapsulated powders. A brief background of tungsten alloy system follows.
Tungsten alloys have two-phase composites consisting of W-Ni-Fe or W-Ni-Cu or even W-Ni-Cu-Fe, and others tungsten alloy is added Co,Mo,Cr, and so on which generally are refractory metal. They have very high melting point and have a density twice that of steel and are more than 50% heavier than lead. Tungsten content in conventional heavy alloys varies from 90 to 98 weight percent and is the reason for their high density (between 16.5 and 18.75 g/cc). Nickel-iron is the most popular additive, in a ratio of 7Ni:3Fe or 8Ni:2Fe (weight ratio). Nickel, iron and copper serve as a binder matrix, which holds the brittle tungsten grains together and which makes tungsten heavy alloys ductile and easy to machine. The conventional processing route for tungsten heavy alloy includes mixing the desired amount of elemental powders, followed by cold pressing and liquid phase sintering to almost full density. The matrix alloy melts and takes some tungsten into solution during liquid phase processing, resulting in a microstructure through which large tungsten grains (20–60μm) are dispersed in the matrix alloy. The as-sintered material results in increased strength and hardness in the heavy alloys which is subjected to thermo mechanical processing by swaging and aging.
The current uses for WHAs (tungsten heavy alloy) are best satisfied with the W-Ni-Fe system. The presence of cobalt within the alloy provides solid-solution strengthening of the binder and slightly enhanced tungsten-matrix interfacial strength. Alloys such as 93W-4.9Ni-2.lFe and 95W-4Ni-lFe represent common compositions. The addition of cobalt to a W-Ni-Fe alloy is a common approach for slight enhancement of both strength and ductility. Cobalt additions of 5 to 15% of the nominal binder weight fraction are most common
The uses of tungsten alloys
With the continuous development of social civilization, the use of tungsten alloys more and more widely for example tungsten alloy radiation shielding and tungsten alloy military defense and tungsten alloy counterweight for sports and tungsten alloy counterbalances ect
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