Tungsten has been sought as a replacement material for depleted uranium in munit

Question

Tungsten has been sought as a replacement material for depleted uranium in munitions applications. However in pure form, tungsten suffers from poor ductility, and alloying has become commonplace in addressing this shortfall. Answer the following questions related to this application: What is the crystal structure of tungsten, its atomic radius, and its atomic volume? Include references for where you found these values Calculate the theoretical density of tungsten based on its crystal structure, atomic radius, and atomic volume. How does this calculated value compare with the tabulated density of tungsten? Alloying W with Ni has proven successful in enhancing ductility albeit at the expense of density. Given a minimum density requirement of 18 g/cc, what is the maximum amount of nickel that can be added to the tungsten lattice? Provide your answer in both atomic and weight %.

Explanation / Answer

A. Tungsten exist in two major crystalline forms alpha and beta, the former has the body centered cubic structureand it is the more stable form.

atomic radius: 2.02 Ao

atomic volume: 9.53 cm3/mol (ref: hyperphysics of tunsten wikipedia)

B. Dnsity = mass/ volume ( atomic mass= 183.85 g)

= 183.85/ 9.53

= 19.291 g/cm3, tabulated density is = 19.25 g/cm3

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