Staballoy

In a military context, staballoys are metal alloys of a high proportion of depleted uranium with other metals, usually titanium or molybdenum, designed for use in kinetic energy penetrator armor-piercing munitions.

An alternative to staballoys in kinetic penetrator munition is tungsten, but it is more expensive, more difficult to machine and is not pyrophoric, so the munition lacks the incendiary effect enhancing its impact.

Tungsten penetrators also tend to form a mushroom shaped tip during armor penetration, while uranium ones tend to be self-sharpening.

[1] An emerging alternative alloy of depleted uranium is stakalloy, formed of niobium (0.01-0.95 wt.%), vanadium (1-4.5 wt.%, between gamma-eutectoid and eutectic) and uranium (balance).

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