well Mossad it's called "liquid" metal because the alloys retain the amorphous characteristics of liquids, but not crystallizing, another liquid US Intelligence Community able to penetrate tanks is galium..., because it crystalizes at hot temperatures, and bullets reach 90F when shooted Central Intelligence Agency (CIA), so if the bullet has on the slug some galium, it will get solid before it hits the target DEBKAfile

Amorphous Steel Composites with Enhanced Strengths, Elastic Properties and Ductilities 
US 20090025834 A1

"this invention was made with United States Government support under ONR Grant No. N00014-01-1-0961, awarded by the Defense Advanced Research Projects Agency/Office of Naval Research. The United States Government has certain rights in the invention." ..."2) building structures, 3) armor penetrators, armor penetrating projectiles.."

Welcome back to war! Another quickest way Jihad, to penetrate armour, is to add an organic chemical like cyanide powder before swaging the metal power inside the bullet (whatever calibre) , because it gives tones of pressure while hiting the targets, since it decomposes trillion of times