The Magneto Hydrodynamic Explosive Munition (MAHEM) is a weapon being developed by DARPA that would utilize molten metal to penetrate enemy armor

Vehicle armour

Military vehicles are commonly armoured to withstand the impact of shrapnel, bullets, missiles, or shells, protecting the personnel inside from enemy fire. Such vehicles include tanks, aircraft, and ships....

. The molten metal would be propelled by electromagnetic fields from explosions. The munition would be delivered to a target as a warhead

Warhead

The term warhead refers to the explosive material and detonator that is delivered by a missile, rocket, or torpedo.- Etymology :During the early development of naval torpedoes, they could be equipped with an inert payload that was intended for use during training, test firing and exercises. This...

 "packaged into a missile, projectile or other platform." DARPA predicts the weapon will have greater efficiency, control, and precision than conventional explosively formed penetrators.