Abstract: The nano-meter sized materials are polycrystals, in which the size of individual crystallites with clean surfaces is in the order of a few nanometers, typically, 5 to 15 nanometers. They are manufactured by compacting the individual crystallites, under a high pressure of 5 GPa, into the solid structure with gas-like disorder. They display different properties from those materials in the crystalline and glassy state. In this paper the physico-mechanical problems of the nano-meter sized materials, including t...