Resumen

D´ANGELO, L; GONZALEZ; OCHOA, J  y  D´ONOFRIO, L. Estudio de las transformaciones estructurales producidas por el proceso de aleación mecánica en el sistema Fe-AlSTUDY OF STRUCTURAL TRANSFORMATIONS PRODUCED BY THE PROCESS OF MECHANICAL ALLOY IN THE Fe-Al SYSTEM. Rev. Fac. Ing. UCV [online]. 2006, vol.21, n.1, pp.39-47. ISSN 0798-4065.

The process of Mechanical Alloy is presented as an alternative for the production of nanophase alloys.The transformation mechanisms that take place during the milling process that promote the phase transformations that occur when the elementary of the constituents of intermetallic compounds are processed are not well defined. In the present work, a comparative study of two different compositions of the Fe-Al system is carried out. We have taken the compositions Fe25% atAl and Fe50% atAl that correspond to the interval of the formation of the intermetallics Fe3Al and FeAl, respectively. Iron and aluminum powders of high purity and milling time intervals from 1 to 50 hours were used. The observed structural variations were considered by the following methods: X-ray diffraction (XRD) applying the Scherrer equation, Williamson Hall model and  of the variations of the reticular parameter of iron using the Bragg law. As a complement, we made a further characterization by Mössbauer spectroscopy, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The results obtained in this work allow us to determine that the formation of the Fe(Al) solid solution can be associated with the deformation of the lattice parameter of iron during milling and with the diffusion of the aluminum atoms inside the iron structure. The rise in deformation is notably accentuated in the mixture with the greater aluminumconcentration.

Palabras clave : Alloy; Ball Milling; XRD; Fe; Al.