Abstract
Al-Fe specimens were mechanically alloyed as a function of composition for extensive times of treatment. From analysis of X-ray diffraction data, supported by the powder pattern fitting with the Rietveld method, it was found that the end-products are mainly BCC extended solid solutions, even in those cases where the major component in the parental mixture was FCC aluminium. The dissipative processes of the solid state reaction are followed with small angle neutron scattering curves of mechanically alloyed Al 66 Fe 34 specimens, which show a slope in the log I vs log Q plot decreasing as a function of the consumption of FCC aluminium. The solid state dissolution of aluminium is also suggested by strong asymmetry of X-ray peak profiles. In particular, the asymmetry of the most intense (110) peak profile of the BCC phase increases linearly as a function of the aluminium/iron atomic ratio. Annealing of the Al-Fe end-products in a differential scanning calorimeter produces varying exothermal features. Analysis of XRD patterns by the Rietveld method helps to define the structural transformations induced in mechanically and thermally treated specimens.
Published Version
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