*Research Scholar, CMJ university, Mechanical Department, Meghalaya
**Professor, VelTech University, Chennai
Online published on 10 October, 2013.
A new method to produce bulk nanocrystalline metal-matrix composites is presented. A metal powder is treated to obtain a relatively brittle layer with a defined thickness on the surface. The precompacted powder is deformed by High-Pressure Torsion until a dense bulk nanocrystalline material is formed. Due to fragmentation of the thin layer, it is possible to incorporate nanometer sized dispersions into the nanocrystalline metal-matrix. As example an oxidized nickel powder is investigated where thermal stability and microhardness are extraordinarily enhanced.
