Study of the short range order in Al90Ni5Ce5 and Al90Fe5Ce5 using EXAFS and XRD

P QUINN; F AUDEBERT; M GALANO; F SAPORITI; M. BOUDARD

Congreso; 7th International Conference on Synchrotron Radiation in Materials Science (SRMS-7),; 2010

Al-based Al-TM-RE (TM: transition metals, RE: rare earths) amorphous alloys systems have been widely studied due to their commercial potential as light alloys with high mechanical strength and good corrosion behavior. In this study X-ray absorption fine structure (XAFS) of the Ni K edge, the Fe K edge and the Ce L3 edge in amorphous Al90Ni5Ce5 and Al90Fe5Ce5 melt spun alloys have been measured and the results combined with X-ray diffraction data and reverse monte carlo (RMC) modelling to try and develop an understanding of the short range order in these systems. Quantitative analysis of the XAFS spectra are limited to the first shell but the results are consistent with the reduced atomic distribution function G(r) obtained from the the x-ray studies and show that there is no significant differences in the models irrespective of the TM (Fe or Ni), which suggests that both alloys have similar local order dominated by topological (size) effects related to different size of atoms.