Top-down Synthesis of Nanostructured Materials: Mechanical and Thermal Processing Methods

摘要

This paper reviews the "top-down" methods for synthesis of nanostructured or submicron grain size materials which utilize severe plastic deformation along with thermal processes. Of the variety of methods discussed, it appears that only ball milling, high pressure torsion, and accumulative roll bonding can regularly produce average grain sizes below 100 nm - that is, nanocrystalline materials. Recent examples of combining conventional deformation processing methods with annealing show the possibility of forming nanocrystalline/submicron grain sizes that can optimize mechanical properties in practical ways.