INVESTIGADORES
GALANO Marina Lorena
congresos y reuniones científicas
Título:
Icosahedral Order in Rapid Solidified Al-Fe based Alloys
Autor/es:
FERNANDO AUDEBERT; FABIANA SAPORITI; MICHEL BOUDARD; MARINA GALANO
Lugar:
Corfu
Reunión:
Simposio; Ismanam 2007; 2007
Resumen:
Rapid solidified Al-Fe based alloys can be obtained with different kinds of microstructures which combine
amorphous, crystalline and quasicrystalline phases. Thus, it is possible to obtain alloys with excellent
mechanical properties, corrosion behaviour and superplasticity behaviour among other properties with great
potential for industrial applications.
The microstructure of the rapid solidified alloys is controlled by the nucleation process. Thus, the knowledge
of the effect of each alloying element on the cluster formation in the undercooled liquid would allow
controlling the microstructure of the rapid solidified alloys.
Several rapid solidified Al-Fe based alloys were studied by means of Mössbauer Spectroscopy, X-ray
diffraction (XRD) and Transmission Electron Microscopy. The total structure factors and the reduced pair
distribution function were obtained from the XRD results. Mössbauer Spectra were fitted using histograms
distribution with the Normos Program.
Moreover, Molecular Dynamic Simulation was performed for binary alloys using potentials obtained from
the Embedded Atom Method (EAM). Cluster analysis using the Honeycutt-Andersen Method was done.
The results suggest that Al-Fe icosahedral clusters are formed in the undercooled liquid and this order can be
modified or stabilised depending of the alloy elements.