Synthesis of nano crystalline nickel by severe plastic deformation

Abstract

Nickel rolled sheet of thickness 0.1 mm has been synthesized by severe plastic deformation. Repeated Cold Rolling, a new type of SPD method has been used and thickness reduction up to 97.5% has been achieved, other reductions have also been performed .The lattice parameters, and the inter-planar spacings of the rolled nickel sheets has been determined using X-ray diffraction. Analysis of X-ray peaks indicated broadening which suggest smaller crystallite sizes. The average grain size of 0.1 mm thickness nickel rolled sheet has come to 850 nm. Grain sizes has been calculated using the image intercept method. Microstructure of rolled nickel sheets has been observed by optical and scanning electron microscopy (SEM).