| abstract |
A nano-crystal metal bulk material which comprises an aggregate of metal nano crystal grains, wherein it further comprises an oxide, nitride, carbide, boride or the like of a metal or metalloid between the above nano crystal grains and/or inside of the grain as a substance inhibiting the growth of the crystal grain; and a method for producing the nano-crystal metal bulk material which comprises subjecting respective fine powders of the components of the nano-crystal metal bulk material to mechanical alloying (MA) by means of a ball mill or the like to prepare nano metal powders, and then subjecting the powders to a massing and forming treatment such as hot massing and forming, for example, spark plasma sintering, extruding or rolling, or explosion forming. The nano-crystal metal bulk material exhibits high hardness, high strength and toughness. |