Synthesis of Ni-Cu Nanocoating by Mechanical Alloying Method on Ni Balls

A nanostructured powder with a uniform distribution of the Ni and Cu powders was produced by means of the Ball Mechanical Alloying Treatment (BMAT). Mutual diffusion of Ni and Cu in the nanostructured layer and the microstructure of the cross section of the remaining powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Electron Probe Microanalyzer (EPMA). The significantly accelerated diffusion rates are expected to be associated with the non-equilibrium states of interfaces in the nanostructured surface layer induced by the Ball Mechanical Alloying Treatment (BMAT). X-ray diffraction patterns revealed that increasing the milling time gives rise to decreasing the crystallite size and lattice parameter during the MA process. Furthermore, scanning electron microscopy (SEM) was utilized not only for evaluating the morphology and microstructure of the remaining powder particles but also for proving this claim that during MA process, the mutual diffusion of Ni and Cu has occurred. Elemental mappings also show that the alloying process occurred in samples but obtaining the uniform shape, size and microstructure of the powder requires the increasing of the milling time.

کلیدواژه ها:

Mechanical Alloying ، X-ray diffraction ، EPMA ، mutual diffusion ، Nanocrystaline Ni-Cu Solid Solution