Study of NiAl3-Ni2Al3 nanostructure intermediate: Kinetic parameters and thermodynamic modeling

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...

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Bibliographic Details
Published in:Calphad 2019-09, Vol.66, p.101632, Article 101632
Main Authors: Biranvand, K.H., Vaezi, M.R., Razavi, M.
Format: Article
Language:English
Subjects:
Aluminum
Ball milling
Ball mills
Crystal defects
Crystallites
Dislocations
Empirical analysis
Friedman and ozawa method
Gibbs free energy
Grain boundaries
Heat treating
Heat treatment
Intermetallic phases
Kinetics
Lattice strain
Mechanical alloying
Mechanical milling
Miedema's semi-empirical model
Parameters
Solid solutions
Thermodynamic modeling
Thermodynamic models
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Summary: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. [Display omitted] •Thermodynamic parameters using the semi-empirical model.•Thermodynamics of nanostructure materials.•Kinetic parameters using free-model methods.•Determining model for the reaction and the effect of mechanical activation on it.•Determining intermediate phases formed during the process.
ISSN:0364-5916
1873-2984
DOI:10.1016/j.calphad.2019.101632