Tungsten Stronger

Consider Tungsten Carbide, $WC$,  $Z=74+6$, density $15.6\,gcm^{-3}$, molar mass  $195.85\,gmol^{-1}$

$v_{boom}=3.4354*\cfrac{density}{Z}$

$v_{boom}=3.4354*\cfrac{15.6*10^{3}}{74+6}=669.90\,ms^{-1}$

and,

$T_{boom}=v^2_{rms}*\cfrac{Molar\,mass}{3*8.3144}$

$T_{boom}=669.90^2*\cfrac{195.85*10^{-3}}{3*8.3144}=3523.67\,K=3250.52\,^oC$

also,

$T_{p}=v^2_{rms}*\cfrac{Molar\,mass}{2*8.3144}$

$T_{p}=669.90^2*\cfrac{195.85*10^{-3}}{2*8.3144}=5285.51\,K=5012.35\,^oC$

which is a very high temperature, but might just anneal tungsten doped with carbon to even greater strength.

Unfortunately, Osmium Carbide, $OsC$ does not occur naturally.