Compaction of copper nanopowder

The problem of void filling in a copper nanocell under external loading generated by a spherical piston is solved. It is demonstrated by computations that a copper nanocell is an unstable system. Small perturbations generated by piston motion lead to void filling under the action of surface tension and to release of significant amounts of thermal energy. After the voids are filled, the initial crystalline structure of nanoparticles is violated and becomes amorphous. When the nanocell is rapidly compressed, a metastable state with a strongly distorted crystal lattice arises, which transforms to an amorphous state with significant amounts of heat released.