Non-Isothermal Kinetic Analysis of Oxidation of Mg-0.15Al Alloy ‎Powder

In the present study, kinetic of oxidation process in Mg-0.15Al powders under non-isothermal condition was ‎studied to determine the empirical kinetic triplets (activation energy (E), pre-exponential factor (A), and ‎kinetic models of reaction (f(α))). In order to determine the mechanism of this process, the phase and ‎structural studies were done by using X-ray diffraction (XRD) and scanning electron microscopy (SEM) ‎methods, respectively. The obtained results showed that magnesium oxide (MgO) and spinel (MgAl2O4) ‎phases were formed from the initial Mg and Al12Mg17 phases during the oxidation process. Microstructural ‎observation confirmed the phenomena occurring during oxidation by the evolution of morphology of ‎particles. Also, the isoconversional, invariant kinetic parameters (IKP) and fitting models were used to ‎investigate the kinetic of this process and to determine the kinetic parameters. The obtained results revealed ‎that this reaction is controlled by a nucleation and growth mechanism with the activation energy (Eα) in the ‎range of 150-320 kJ/mol.‎