Abstract
In this study, a mixture of nickel and aluminum powder in a planetary ball mill was mixed to determine the mechanism of production of the mechanical milling process for different times. Gibbs free energy has been calculated for the formation of solid solution, intermetallic and amorphous phase using the Miedema's semi-empirical model and the effect of defects produced during milling such as grain boundaries and Dislocations were considered in the thermodynamics. The results showed that the intermetallic phase has been the most stable phase after mechanical processing. Kinetic parameter was determined for the formation of intermediate phase during the mechanical alloying. Activation energy was calculated using free-model and model-fitting methods such as Friedman, Flynn-Wall-Ozawa and Coats-Redfern. The milled powders have been heat treated at various temperature and In order to evaluate the phases and compare the theoretical and experimental results, analyzes SEM and XRD have been done. Lattice strain and crystallite size have been calculated using XRD patterns and Williamson-Hall equation.
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