Extreme creep resistant nano-crystalline metallic materials

A process for forming an extreme creep-resistant nano-crystalline metallic material comprised of a solvent metal comprising 50 to 99.9 atomic percent (at. %) of the material, and at least one solute metal dispersed in the solvent metal, comprising 0.1 to 50 at. % of the metallic material, the process comprising:

• subjecting metals of the solvent metal and the at least one solute metal to a non-equilibrium processing technique so as to produce:
• a matrix formed of a solvent metal or alloy and comprising crystalline grains having diameters of no more than about 500 nm;
• and
• a plurality of dispersed metallic particles formed from a basis of the solute metal in the solvent metal matrix and having diameters of no more than about 200 nm,
• wherein the particle density along the grain boundary of the matrix is as high as about 2 nm2 of grain boundary area per particle so as to substantially block grain boundary motion and rotation and limit creep at temperatures above 35% of the melting point of the material.